SEC Info - Coherent Inc - ‘10-K’ for 9/29/18

SEC Info℠

Home

Help

Please Sign In

Coherent Inc – ‘10-K’ for 9/29/18 – ‘EX-101.CAL’

On: Tuesday, 11/27/18, at 4:15pm ET · For: 9/29/18 · Accession #: 21510-18-29 · File #: 1-33962

  As Of               Filer                 Filing    For·On·As Docs:Size

11/27/18  Coherent Inc                      10-K        9/29/18  107:15M

Annual Report — Form 10-K — Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   1.31M 
 2: EX-10.11    Material Contract                                   HTML     57K 
 3: EX-10.12    Material Contract                                   HTML     65K 
 4: EX-10.13    Material Contract                                   HTML     78K 
 5: EX-21.1     Subsidiaries List                                   HTML     40K 
 6: EX-23.1     Consent of Experts or Counsel                       HTML     29K 
 7: EX-31.1     Certification -- §302 - SOA'02                      HTML     36K 
 8: EX-31.2     Certification -- §302 - SOA'02                      HTML     36K 
 9: EX-32.1     Certification -- §906 - SOA'02                      HTML     30K 
10: EX-32.2     Certification -- §906 - SOA'02                      HTML     30K 
17: R1          DEI Document                                        HTML     57K 
18: R2          Consolidated Balance Sheets                         HTML    109K 
19: R3          Consolidated Balance Sheets (Parenthetical)         HTML     37K 
20: R4          Consolidated Statements of Operations               HTML    116K 
21: R5          Consolidated Statements of Comprehensive Income     HTML     66K 
22: R6          Consolidated Statements of Stockholders' Equity     HTML     76K 
23: R7          Consolidated Statements of Cash Flows               HTML    170K 
24: R8          Consolidated Statements of Cash Flows               HTML     37K 
                Reconciliation of cash, cash equivalent and                      
                restricted cash reported                                         
25: R9          Description of Business                             HTML     31K 
26: R10         Significant Accounting Policies                     HTML    176K 
27: R11         Business Combinations                               HTML     96K 
28: R12         Fair Values                                         HTML    119K 
29: R13         Short-Term Investments                              HTML     82K 
30: R14         Derivative Instruments and Hedging Activities       HTML     96K 
31: R15         Goodwill and Intangible Assets                      HTML     98K 
32: R16         Balance Sheet Details                               HTML     74K 
33: R17         Borrowings                                          HTML     80K 
34: R18         Commitments and Contingencies                       HTML     45K 
35: R19         Stock Repurchases                                   HTML     32K 
36: R20         Employee Stock Award and Benefit Plans              HTML    160K 
37: R21         Defined Benefit Plans (Notes)                       HTML    210K 
38: R22         Other Income (Expense), Net                         HTML     43K 
39: R23         Income Taxes                                        HTML    189K 
40: R24         Segment and Geographic Information                  HTML    103K 
41: R25         Restructuring Charges (Notes)                       HTML     58K 
42: R26         Discontinued Operations and Sale of Assets Held     HTML     69K 
                for Sale                                                         
43: R27         Subsequent Events                                   HTML     32K 
44: R28         Quarterly Financial Information (Unaudited)         HTML     78K 
45: R29         Significant Accounting Policies (Policies)          HTML    167K 
46: R30         Significant Accounting Policies (Tables)            HTML    127K 
47: R31         Business Combinations (Tables)                      HTML     74K 
48: R32         Fair Values (Tables)                                HTML    115K 
49: R33         Short-Term Investments (Tables)                     HTML     84K 
50: R34         Derivative Instruments and Hedging Activities       HTML     89K 
                (Tables)                                                         
51: R35         Goodwill and Intangible Assets (Tables)             HTML     95K 
52: R36         Balance Sheet Details (Tables)                      HTML     78K 
53: R37         Borrowings Short term borrowing and current         HTML     57K 
                portion of long term debt (Tables)                               
54: R38         Commitments and Contingencies (Tables)              HTML     36K 
55: R39         Employee Stock Award and Benefit Plans (Tables)     HTML    143K 
56: R40         Defined Benefit Plans (Tables)                      HTML    217K 
57: R41         Other Income (Expense), Net (Tables)                HTML     42K 
58: R42         Income Taxes (Tables)                               HTML    182K 
59: R43         Segment and Geographic Information (Tables)         HTML    103K 
60: R44         Restructuring Charges (Tables)                      HTML     55K 
61: R45         Discontinued Operations and Sale of Assets Held     HTML     71K 
                for Sale (Tables)                                                
62: R46         Significant Accounting Policies - Fiscal Year,      HTML     50K 
                Basis of Presentation, Cash Equivalents and                      
                Concentration of Credit Risk (Details)                           
63: R47         Significant Accounting Policies - Accounts          HTML     37K 
                receivable Allowances (Details)                                  
64: R48         Significant Accounting Policies - Inventories       HTML     39K 
                (Details)                                                        
65: R49         Significant Accounting Policies - Property and      HTML     58K 
                Equipment (Details)                                              
66: R50         Significant Accounting Policies - Asset Retirement  HTML     52K 
                Obligations (Details)                                            
67: R51         Significant Accounting Policies - Long-lived        HTML     37K 
                assets (Details)                                                 
68: R52         Significant Accounting Policies - Intangible        HTML     33K 
                Assets (Details)                                                 
69: R53         Significant Accounting Policies - Warranty          HTML     44K 
                Reserves (Details)                                               
70: R54         Significant Accounting Policies - Research and      HTML     30K 
                Development (Details)                                            
71: R55         Significant Accounting Policies - Comprehensive     HTML     34K 
                Income (Loss) (Details)                                          
72: R56         Significant Accounting Policies - Earnings Per      HTML     55K 
                Share (Details)                                                  
73: R57         Significant Accounting Policies - Income Taxes      HTML     32K 
                (Details)                                                        
74: R58         Significant Accounting Policies - New Accounting    HTML     38K 
                Pronouncements (Details)                                         
75: R59         Business Combinations (Details)                     HTML    184K 
76: R60         Fair Values (Details)                               HTML    111K 
77: R61         Business Combinations - Additional Information      HTML    109K 
                (Details)                                                        
78: R62         Short-Term Investments (Details)                    HTML     73K 
79: R63         Derivative Instruments and Hedging Activities -     HTML     88K 
                Notional and Fair Value (Details)                                
80: R64         Goodwill and Intangible Assets - Goodwill           HTML     49K 
                (Details)                                                        
81: R65         Goodwill and Intangible Assets - Intangible Assets  HTML     77K 
                (Details)                                                        
82: R66         Balance Sheet Details (Details)                     HTML     97K 
83: R67         Borrowings - Narrative (Details)                    HTML    156K 
84: R68         Borrowings - Summary of Borrowings (Details)        HTML     76K 
85: R69         Commitments and Contingencies - Operating Leases    HTML     50K 
                (Details)                                                        
86: R70         Commitments and Contingencies - Purchase            HTML     35K 
                Commitments (Details)                                            
87: R71         Stock Repurchases (Details)                         HTML     45K 
88: R72         Employee Stock Award and Benefit Plans - Deferred   HTML     54K 
                Compensation Plans (Details)                                     
89: R73         Employee Stock Award and Benefit Plans - Employee   HTML     32K 
                Retirement and Investment and Stock Purchase Plans               
                (Details)                                                        
90: R74         Employee Stock Award and Benefit Plans - Stock      HTML     64K 
                Option Plans (Details)                                           
91: R75         Employee Stock Award and Benefit Plans - Fair       HTML     48K 
                Value of Stock Compensation (Details)                            
92: R76         Employee Stock Award and Benefit Plans - Stock      HTML     68K 
                Compensation Expense (Details)                                   
93: R77         Employee Stock Award and Benefit Plans - Shares     HTML     31K 
                Authorized under Stock Option Plans, by Exercise                 
                Price Range (Details)                                            
94: R78         Employee Stock Award and Benefit Plans - Stock      HTML     78K 
                Options and Awards Activity (Details)                            
95: R79         Defined Benefit Plans (Details)                     HTML    255K 
96: R80         Other Income (Expense), Net (Details)               HTML     37K 
97: R81         Income Taxes (Details)                              HTML    230K 
98: R82         Income Taxes - Contingency (Details)                HTML     68K 
99: R83         Segment and Geographic Information (Details)        HTML     70K 
100: R84         Segment and Geographic Information - Revenue and    HTML     66K  
                Long-Lived Assets by Geographical Areas (Details)                
101: R85         Restructuring Charges (Details)                     HTML     54K  
102: R86         Discontinued Operations and Sale of Assets Held     HTML    114K  
                for Sale (Details)                                               
103: R87         Subsequent Events (Details)                         HTML     41K  
104: R88         Quarterly Financial Information (Unaudited)         HTML     47K  
                (Details)                                                        
106: XML         IDEA XML File -- Filing Summary                      XML    185K  
105: EXCEL       IDEA Workbook of Financial Reports                  XLSX    152K  
11: EX-101.INS  XBRL Instance -- cohr-20180929                       XML   4.93M 
13: EX-101.CAL  XBRL Calculations -- cohr-20180929_cal               XML    401K 
14: EX-101.DEF  XBRL Definitions -- cohr-20180929_def                XML   1.11M 
15: EX-101.LAB  XBRL Labels -- cohr-20180929_lab                     XML   2.94M 
16: EX-101.PRE  XBRL Presentations -- cohr-20180929_pre              XML   1.64M 
12: EX-101.SCH  XBRL Schema -- cohr-20180929                         XSD    274K 
107: ZIP         XBRL Zipped Folder -- 0000021510-18-000029-xbrl      Zip    444K

‘EX-101.CAL’ — XBRL Calculations — cohr-20180929_cal

This Exhibit is an XBRL XML File.

<?xml version="1.0" encoding="windows-1252"?>

<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

<link:roleRef roleURI="http://www.coherent.com/role/BalanceSheetDetails" xlink:href="cohr-20180929.xsd#BalanceSheetDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/BalanceSheetDetailsDetails" xlink:href="cohr-20180929.xsd#BalanceSheetDetailsDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/BalanceSheetDetailsTables" xlink:href="cohr-20180929.xsd#BalanceSheetDetailsTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/Borrowings" xlink:href="cohr-20180929.xsd#Borrowings" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/BorrowingsNarrativeDetails" xlink:href="cohr-20180929.xsd#BorrowingsNarrativeDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/BorrowingsShortTermBorrowingAndCurrentPortionOfLongTermDebtTables" xlink:href="cohr-20180929.xsd#BorrowingsShortTermBorrowingAndCurrentPortionOfLongTermDebtTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/BorrowingsSummaryOfBorrowingsDetails" xlink:href="cohr-20180929.xsd#BorrowingsSummaryOfBorrowingsDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/BusinessCombinations" xlink:href="cohr-20180929.xsd#BusinessCombinations" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/BusinessCombinationsAdditionalInformationDetails" xlink:href="cohr-20180929.xsd#BusinessCombinationsAdditionalInformationDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/BusinessCombinationsDetails" xlink:href="cohr-20180929.xsd#BusinessCombinationsDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/BusinessCombinationsTables" xlink:href="cohr-20180929.xsd#BusinessCombinationsTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/CommitmentsAndContingencies" xlink:href="cohr-20180929.xsd#CommitmentsAndContingencies" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/CommitmentsAndContingenciesOperatingLeasesDetails" xlink:href="cohr-20180929.xsd#CommitmentsAndContingenciesOperatingLeasesDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/CommitmentsAndContingenciesPurchaseCommitmentsDetails" xlink:href="cohr-20180929.xsd#CommitmentsAndContingenciesPurchaseCommitmentsDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/CommitmentsAndContingenciesTables" xlink:href="cohr-20180929.xsd#CommitmentsAndContingenciesTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/ConsolidatedBalanceSheets" xlink:href="cohr-20180929.xsd#ConsolidatedBalanceSheets" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="cohr-20180929.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="cohr-20180929.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/ConsolidatedStatementsOfCashFlowsReconciliationOfCashCashEquivalentAndRestrictedCashReported" xlink:href="cohr-20180929.xsd#ConsolidatedStatementsOfCashFlowsReconciliationOfCashCashEquivalentAndRestrictedCashReported" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:href="cohr-20180929.xsd#ConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/ConsolidatedStatementsOfOperations" xlink:href="cohr-20180929.xsd#ConsolidatedStatementsOfOperations" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/ConsolidatedStatementsOfStockholdersEquity" xlink:href="cohr-20180929.xsd#ConsolidatedStatementsOfStockholdersEquity" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/DefinedBenefitPlansDetails" xlink:href="cohr-20180929.xsd#DefinedBenefitPlansDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/DefinedBenefitPlansNotes" xlink:href="cohr-20180929.xsd#DefinedBenefitPlansNotes" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/DefinedBenefitPlansTables" xlink:href="cohr-20180929.xsd#DefinedBenefitPlansTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/DeiDocument" xlink:href="cohr-20180929.xsd#DeiDocument" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/DerivativeInstrumentsAndHedgingActivities" xlink:href="cohr-20180929.xsd#DerivativeInstrumentsAndHedgingActivities" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/DerivativeInstrumentsAndHedgingActivitiesNotionalAndFairValueDetails" xlink:href="cohr-20180929.xsd#DerivativeInstrumentsAndHedgingActivitiesNotionalAndFairValueDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/DerivativeInstrumentsAndHedgingActivitiesTables" xlink:href="cohr-20180929.xsd#DerivativeInstrumentsAndHedgingActivitiesTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/DescriptionOfBusiness" xlink:href="cohr-20180929.xsd#DescriptionOfBusiness" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/DiscontinuedOperationsAndSaleOfAssetsHeldForSale" xlink:href="cohr-20180929.xsd#DiscontinuedOperationsAndSaleOfAssetsHeldForSale" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/DiscontinuedOperationsAndSaleOfAssetsHeldForSaleDetails" xlink:href="cohr-20180929.xsd#DiscontinuedOperationsAndSaleOfAssetsHeldForSaleDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/DiscontinuedOperationsAndSaleOfAssetsHeldForSaleTables" xlink:href="cohr-20180929.xsd#DiscontinuedOperationsAndSaleOfAssetsHeldForSaleTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlans" xlink:href="cohr-20180929.xsd#EmployeeStockAwardAndBenefitPlans" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansDeferredCompensationPlansDetails" xlink:href="cohr-20180929.xsd#EmployeeStockAwardAndBenefitPlansDeferredCompensationPlansDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansEmployeeRetirementAndInvestmentAndStockPurchasePlansDetails" xlink:href="cohr-20180929.xsd#EmployeeStockAwardAndBenefitPlansEmployeeRetirementAndInvestmentAndStockPurchasePlansDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansFairValueOfStockCompensationDetails" xlink:href="cohr-20180929.xsd#EmployeeStockAwardAndBenefitPlansFairValueOfStockCompensationDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeDetails" xlink:href="cohr-20180929.xsd#EmployeeStockAwardAndBenefitPlansSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansStockCompensationExpenseDetails" xlink:href="cohr-20180929.xsd#EmployeeStockAwardAndBenefitPlansStockCompensationExpenseDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansStockOptionPlansDetails" xlink:href="cohr-20180929.xsd#EmployeeStockAwardAndBenefitPlansStockOptionPlansDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansStockOptionsAndAwardsActivityDetails" xlink:href="cohr-20180929.xsd#EmployeeStockAwardAndBenefitPlansStockOptionsAndAwardsActivityDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansTables" xlink:href="cohr-20180929.xsd#EmployeeStockAwardAndBenefitPlansTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/FairValues" xlink:href="cohr-20180929.xsd#FairValues" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/FairValuesDetails" xlink:href="cohr-20180929.xsd#FairValuesDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/FairValuesTables" xlink:href="cohr-20180929.xsd#FairValuesTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/GoodwillAndIntangibleAssets" xlink:href="cohr-20180929.xsd#GoodwillAndIntangibleAssets" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/GoodwillAndIntangibleAssetsGoodwillDetails" xlink:href="cohr-20180929.xsd#GoodwillAndIntangibleAssetsGoodwillDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/GoodwillAndIntangibleAssetsIntangibleAssetsDetails" xlink:href="cohr-20180929.xsd#GoodwillAndIntangibleAssetsIntangibleAssetsDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/GoodwillAndIntangibleAssetsTables" xlink:href="cohr-20180929.xsd#GoodwillAndIntangibleAssetsTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/IncomeTaxes" xlink:href="cohr-20180929.xsd#IncomeTaxes" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/IncomeTaxesContingencyDetails" xlink:href="cohr-20180929.xsd#IncomeTaxesContingencyDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/IncomeTaxesDetails" xlink:href="cohr-20180929.xsd#IncomeTaxesDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/IncomeTaxesDetailsCalc2" xlink:href="cohr-20180929.xsd#IncomeTaxesDetailsCalc2" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/IncomeTaxesTables" xlink:href="cohr-20180929.xsd#IncomeTaxesTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/OtherIncomeExpenseNet" xlink:href="cohr-20180929.xsd#OtherIncomeExpenseNet" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/OtherIncomeExpenseNetDetails" xlink:href="cohr-20180929.xsd#OtherIncomeExpenseNetDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/OtherIncomeExpenseNetTables" xlink:href="cohr-20180929.xsd#OtherIncomeExpenseNetTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/QuarterlyFinancialInformationUnaudited" xlink:href="cohr-20180929.xsd#QuarterlyFinancialInformationUnaudited" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/QuarterlyFinancialInformationUnauditedDetails" xlink:href="cohr-20180929.xsd#QuarterlyFinancialInformationUnauditedDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/RestructuringChargesDetails" xlink:href="cohr-20180929.xsd#RestructuringChargesDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/RestructuringChargesNotes" xlink:href="cohr-20180929.xsd#RestructuringChargesNotes" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/RestructuringChargesTables" xlink:href="cohr-20180929.xsd#RestructuringChargesTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SegmentAndGeographicInformation" xlink:href="cohr-20180929.xsd#SegmentAndGeographicInformation" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SegmentAndGeographicInformationDetails" xlink:href="cohr-20180929.xsd#SegmentAndGeographicInformationDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SegmentAndGeographicInformationRevenueAndLongLivedAssetsByGeographicalAreasDetails" xlink:href="cohr-20180929.xsd#SegmentAndGeographicInformationRevenueAndLongLivedAssetsByGeographicalAreasDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SegmentAndGeographicInformationTables" xlink:href="cohr-20180929.xsd#SegmentAndGeographicInformationTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/ShortTermInvestments" xlink:href="cohr-20180929.xsd#ShortTermInvestments" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/ShortTermInvestmentsDetails" xlink:href="cohr-20180929.xsd#ShortTermInvestmentsDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/ShortTermInvestmentsTables" xlink:href="cohr-20180929.xsd#ShortTermInvestmentsTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPolicies" xlink:href="cohr-20180929.xsd#SignificantAccountingPolicies" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesAccountsReceivableAllowancesDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesAccountsReceivableAllowancesDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesAssetRetirementObligationsDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesAssetRetirementObligationsDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesComprehensiveIncomeLossDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesComprehensiveIncomeLossDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesEarningsPerShareDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesEarningsPerShareDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesFiscalYearBasisOfPresentationCashEquivalentsAndConcentrationOfCreditRiskDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesFiscalYearBasisOfPresentationCashEquivalentsAndConcentrationOfCreditRiskDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesIncomeTaxesDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesIncomeTaxesDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesIntangibleAssetsDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesIntangibleAssetsDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesInventoriesDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesInventoriesDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesLongLivedAssetsDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesLongLivedAssetsDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesNewAccountingPronouncementsDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesNewAccountingPronouncementsDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesPolicies" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesPolicies" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesPropertyAndEquipmentDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesPropertyAndEquipmentDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesResearchAndDevelopmentDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesResearchAndDevelopmentDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesTables" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesTables" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SignificantAccountingPoliciesWarrantyReservesDetails" xlink:href="cohr-20180929.xsd#SignificantAccountingPoliciesWarrantyReservesDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/StockRepurchases" xlink:href="cohr-20180929.xsd#StockRepurchases" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/StockRepurchasesDetails" xlink:href="cohr-20180929.xsd#StockRepurchasesDetails" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SubsequentEvents" xlink:href="cohr-20180929.xsd#SubsequentEvents" xlink:type="simple"/>

<link:roleRef roleURI="http://www.coherent.com/role/SubsequentEventsDetails" xlink:href="cohr-20180929.xsd#SubsequentEventsDetails" xlink:type="simple"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/BalanceSheetDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/BalanceSheetDetailsDetails" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_f234998c-5e05-09d0-d53e-5c44423c97c0" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccruedIncomeTaxesNoncurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesNoncurrent_39fdf2e0-cba9-5ec1-5f6b-a944b9ccb0d0" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_f234998c-5e05-09d0-d53e-5c44423c97c0" xlink:to="loc_us-gaap_AccruedIncomeTaxesNoncurrent_39fdf2e0-cba9-5ec1-5f6b-a944b9ccb0d0" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent" xlink:label="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_13bb68ff-220d-fc94-a876-04b8f3aef199" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_f234998c-5e05-09d0-d53e-5c44423c97c0" xlink:to="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_13bb68ff-220d-fc94-a876-04b8f3aef199" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_314eb579-3ee1-408c-39f2-e62f2f37befc" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_f234998c-5e05-09d0-d53e-5c44423c97c0" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_314eb579-3ee1-408c-39f2-e62f2f37befc" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredRevenueNoncurrent" xlink:label="loc_us-gaap_DeferredRevenueNoncurrent_11e98ceb-5737-f44d-6a16-2d8b64b1228d" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_f234998c-5e05-09d0-d53e-5c44423c97c0" xlink:to="loc_us-gaap_DeferredRevenueNoncurrent_11e98ceb-5737-f44d-6a16-2d8b64b1228d" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetRetirementObligationsNoncurrent" xlink:label="loc_us-gaap_AssetRetirementObligationsNoncurrent_1f4fb651-4881-fed9-af88-845715d74664" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_f234998c-5e05-09d0-d53e-5c44423c97c0" xlink:to="loc_us-gaap_AssetRetirementObligationsNoncurrent_1f4fb651-4881-fed9-af88-845715d74664" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_9a02138f-e52f-25fa-014e-0405ac9ddb27" xlink:type="locator"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_f234998c-5e05-09d0-d53e-5c44423c97c0" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_9a02138f-e52f-25fa-014e-0405ac9ddb27" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_OtherLongTermliabilitiesNoncurrent1" xlink:label="loc_cohr_OtherLongTermliabilitiesNoncurrent1_53edad20-cf90-fd37-5605-98f70b17c9e8" xlink:type="locator"/>

<link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_f234998c-5e05-09d0-d53e-5c44423c97c0" xlink:to="loc_cohr_OtherLongTermliabilitiesNoncurrent1_53edad20-cf90-fd37-5605-98f70b17c9e8" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_9b27fab9-d497-627b-4cfb-6b585220b978" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsNetNoncurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetNoncurrent_0176d7b6-3703-b24f-2db3-fb35a9f915aa" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_9b27fab9-d497-627b-4cfb-6b585220b978" xlink:to="loc_us-gaap_DeferredTaxAssetsNetNoncurrent_0176d7b6-3703-b24f-2db3-fb35a9f915aa" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_ee9e85f0-05da-4047-53be-09ca681d9b98" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_9b27fab9-d497-627b-4cfb-6b585220b978" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_ee9e85f0-05da-4047-53be-09ca681d9b98" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_DeferredCompensationPlanNoncurrent" xlink:label="loc_cohr_DeferredCompensationPlanNoncurrent_a496f82a-b64e-4ed8-afad-98f70ab3faec" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_9b27fab9-d497-627b-4cfb-6b585220b978" xlink:to="loc_cohr_DeferredCompensationPlanNoncurrent_a496f82a-b64e-4ed8-afad-98f70ab3faec" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_b4e6cca3-6c62-3e0a-6782-510b974f1199" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_cf9ed09f-3dd1-4a4b-d3fc-3b0db18c1b40" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_b4e6cca3-6c62-3e0a-6782-510b974f1199" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_cf9ed09f-3dd1-4a4b-d3fc-3b0db18c1b40" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_00b000cf-7f1d-4891-7244-daf9f6335db0" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_b4e6cca3-6c62-3e0a-6782-510b974f1199" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_00b000cf-7f1d-4891-7244-daf9f6335db0" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent" xlink:label="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_cf568899-4af8-240a-e6cf-960ccd2e6477" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_b4e6cca3-6c62-3e0a-6782-510b974f1199" xlink:to="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_cf568899-4af8-240a-e6cf-960ccd2e6477" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent" xlink:label="loc_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent_f7173c6e-6dcb-ce4b-bd07-2c0e34ab99f7" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_b4e6cca3-6c62-3e0a-6782-510b974f1199" xlink:to="loc_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent_f7173c6e-6dcb-ce4b-bd07-2c0e34ab99f7" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CustomerDepositsCurrent" xlink:label="loc_us-gaap_CustomerDepositsCurrent_ce476672-55cd-838d-bb2a-a93841526e10" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_b4e6cca3-6c62-3e0a-6782-510b974f1199" xlink:to="loc_us-gaap_CustomerDepositsCurrent_ce476672-55cd-838d-bb2a-a93841526e10" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_98f473f8-2d19-99d7-6142-37f86ccd14ec" xlink:type="locator"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_b4e6cca3-6c62-3e0a-6782-510b974f1199" xlink:to="loc_us-gaap_DeferredRevenueCurrent_98f473f8-2d19-99d7-6142-37f86ccd14ec" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_2294e6a2-7bab-43ed-d02c-bdf73b8fa561" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PrepaidTaxes" xlink:label="loc_us-gaap_PrepaidTaxes_02645454-7101-7c15-39a1-317d5d74cc69" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_2294e6a2-7bab-43ed-d02c-bdf73b8fa561" xlink:to="loc_us-gaap_PrepaidTaxes_02645454-7101-7c15-39a1-317d5d74cc69" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_OtherTaxesReceivable" xlink:label="loc_cohr_OtherTaxesReceivable_b179e388-619a-ab68-4187-42d8dc1c6c2a" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_2294e6a2-7bab-43ed-d02c-bdf73b8fa561" xlink:to="loc_cohr_OtherTaxesReceivable_b179e388-619a-ab68-4187-42d8dc1c6c2a" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherPrepaidExpenseCurrent" xlink:label="loc_us-gaap_OtherPrepaidExpenseCurrent_e934c1a2-8f4f-370a-269f-0fc41b365e68" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_2294e6a2-7bab-43ed-d02c-bdf73b8fa561" xlink:to="loc_us-gaap_OtherPrepaidExpenseCurrent_e934c1a2-8f4f-370a-269f-0fc41b365e68" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/BalanceSheetDetailsTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/Borrowings" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/BorrowingsNarrativeDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/BorrowingsShortTermBorrowingAndCurrentPortionOfLongTermDebtTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/BorrowingsSummaryOfBorrowingsDetails" xlink:type="extended">

<link:loc xlink:href="cohr-20180929.xsd#cohr_Longtermdebtmaturinginyearsevenandthereafter" xlink:label="loc_cohr_Longtermdebtmaturinginyearsevenandthereafter_385d7072-e574-9742-6943-42d8dddecc1d" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_f61bf97e-c3a5-ba72-7591-eba8e7bb6a44" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Longtermdebtmaturinginyearsevenandthereafter_385d7072-e574-9742-6943-42d8dddecc1d" xlink:to="loc_us-gaap_LongTermDebtCurrent_f61bf97e-c3a5-ba72-7591-eba8e7bb6a44" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_Longtermdebtmaturinginyeartwo" xlink:label="loc_cohr_Longtermdebtmaturinginyeartwo_ceaf3529-3873-2b12-ee42-42d8de9cf731" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Longtermdebtmaturinginyearsevenandthereafter_385d7072-e574-9742-6943-42d8dddecc1d" xlink:to="loc_cohr_Longtermdebtmaturinginyeartwo_ceaf3529-3873-2b12-ee42-42d8de9cf731" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_Longtermdebtmaturinginyearthree" xlink:label="loc_cohr_Longtermdebtmaturinginyearthree_c58fa455-c913-61ec-797a-42d8de88a945" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Longtermdebtmaturinginyearsevenandthereafter_385d7072-e574-9742-6943-42d8dddecc1d" xlink:to="loc_cohr_Longtermdebtmaturinginyearthree_c58fa455-c913-61ec-797a-42d8de88a945" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_Longtermdebtmaturinginyearfour" xlink:label="loc_cohr_Longtermdebtmaturinginyearfour_71ca20cc-cedc-6dc6-8237-42d8ddf22341" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Longtermdebtmaturinginyearsevenandthereafter_385d7072-e574-9742-6943-42d8dddecc1d" xlink:to="loc_cohr_Longtermdebtmaturinginyearfour_71ca20cc-cedc-6dc6-8237-42d8ddf22341" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_Longtermdebtmaturinginyearfive" xlink:label="loc_cohr_Longtermdebtmaturinginyearfive_e3c9d347-2b7b-9d97-afdf-42d8de9c3ba1" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Longtermdebtmaturinginyearsevenandthereafter_385d7072-e574-9742-6943-42d8dddecc1d" xlink:to="loc_cohr_Longtermdebtmaturinginyearfive_e3c9d347-2b7b-9d97-afdf-42d8de9c3ba1" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_Longtermdebtmaturinginyearsix" xlink:label="loc_cohr_Longtermdebtmaturinginyearsix_b3e50a35-8f9c-0127-42c4-42d8dd843a47" xlink:type="locator"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Longtermdebtmaturinginyearsevenandthereafter_385d7072-e574-9742-6943-42d8dddecc1d" xlink:to="loc_cohr_Longtermdebtmaturinginyearsix_b3e50a35-8f9c-0127-42c4-42d8dd843a47" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_7e14882f-7ab9-8302-20ff-24c510ab8806" xlink:type="locator"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_CurrentportionofEuroTermLoan" xlink:label="loc_cohr_CurrentportionofEuroTermLoan_8DABCAF467AB4D3A0D691DE1CFF037B3" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_7e14882f-7ab9-8302-20ff-24c510ab8806" xlink:to="loc_cohr_CurrentportionofEuroTermLoan_8DABCAF467AB4D3A0D691DE1CFF037B3" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_A1.3TermLoandue2024" xlink:label="loc_cohr_A1.3TermLoandue2024_d4879f21-9c36-4206-1113-42d8de6a74f2" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_7e14882f-7ab9-8302-20ff-24c510ab8806" xlink:to="loc_cohr_A1.3TermLoandue2024_d4879f21-9c36-4206-1113-42d8de6a74f2" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_A1.0StateofConnecticutTermLoandue2023" xlink:label="loc_cohr_A1.0StateofConnecticutTermLoandue2023_1f2d8972-98a3-fc5d-933d-42d8ddcae8bd" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_7e14882f-7ab9-8302-20ff-24c510ab8806" xlink:to="loc_cohr_A1.0StateofConnecticutTermLoandue2023_1f2d8972-98a3-fc5d-933d-42d8ddcae8bd" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_O.R.Lasertechloans" xlink:label="loc_cohr_O.R.Lasertechloans_B6E372EFF5028EA67CAE27A1FC3D550F" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_7e14882f-7ab9-8302-20ff-24c510ab8806" xlink:to="loc_cohr_O.R.Lasertechloans_B6E372EFF5028EA67CAE27A1FC3D550F" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShortTermBorrowings" xlink:label="loc_us-gaap_ShortTermBorrowings_c4493b41-4418-ed41-2f06-05ff9c61369f" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ShortTermBorrowings_c4493b41-4418-ed41-2f06-05ff9c61369f" xlink:to="loc_cohr_CurrentportionofEuroTermLoan_8DABCAF467AB4D3A0D691DE1CFF037B3" xlink:type="arc"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ShortTermBorrowings_c4493b41-4418-ed41-2f06-05ff9c61369f" xlink:to="loc_cohr_A1.3TermLoandue2024_d4879f21-9c36-4206-1113-42d8de6a74f2" xlink:type="arc"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ShortTermBorrowings_c4493b41-4418-ed41-2f06-05ff9c61369f" xlink:to="loc_cohr_A1.0StateofConnecticutTermLoandue2023_1f2d8972-98a3-fc5d-933d-42d8ddcae8bd" xlink:type="arc"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ShortTermBorrowings_c4493b41-4418-ed41-2f06-05ff9c61369f" xlink:to="loc_cohr_O.R.Lasertechloans_B6E372EFF5028EA67CAE27A1FC3D550F" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/BusinessCombinations" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/BusinessCombinationsAdditionalInformationDetails" xlink:type="extended">

<link:loc xlink:href="cohr-20180929.xsd#cohr_Totalpurchasepricetoallocate" xlink:label="loc_cohr_Totalpurchasepricetoallocate_456957f8-8d05-42ff-359c-42d8ddcad82a" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_bc66fcc7-4638-7e93-2948-b833e774a337" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Totalpurchasepricetoallocate_456957f8-8d05-42ff-359c-42d8ddcad82a" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_bc66fcc7-4638-7e93-2948-b833e774a337" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_CashconsiderationtoRofinsshareholders" xlink:label="loc_cohr_CashconsiderationtoRofinsshareholders_5a8e3ec9-ad40-25fc-39d8-42d8ddd4b2e5" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PaymentsToAcquireBusinessesGross_bc66fcc7-4638-7e93-2948-b833e774a337" xlink:to="loc_cohr_CashconsiderationtoRofinsshareholders_5a8e3ec9-ad40-25fc-39d8-42d8ddd4b2e5" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_PaymentduetocancellationofoptionsheldbyRofinemployees" xlink:label="loc_cohr_PaymentduetocancellationofoptionsheldbyRofinemployees_183c676c-5fae-d17b-3a92-42d8dd0261a9" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PaymentsToAcquireBusinessesGross_bc66fcc7-4638-7e93-2948-b833e774a337" xlink:to="loc_cohr_PaymentduetocancellationofoptionsheldbyRofinemployees_183c676c-5fae-d17b-3a92-42d8dd0261a9" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_FairvalueofpreviouslyownedRofinshares" xlink:label="loc_cohr_FairvalueofpreviouslyownedRofinshares_950213a8-1b04-3cec-b70a-42d8dc9eb00f" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Totalpurchasepricetoallocate_456957f8-8d05-42ff-359c-42d8ddcad82a" xlink:to="loc_cohr_FairvalueofpreviouslyownedRofinshares_950213a8-1b04-3cec-b70a-42d8dc9eb00f" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_Postmergerstockcompensationexpense" xlink:label="loc_cohr_Postmergerstockcompensationexpense_fea7ffbd-66bb-7f60-1650-42d8de6011fa" xlink:type="locator"/>

<link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Totalpurchasepricetoallocate_456957f8-8d05-42ff-359c-42d8ddcad82a" xlink:to="loc_cohr_Postmergerstockcompensationexpense_fea7ffbd-66bb-7f60-1650-42d8de6011fa" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/BusinessCombinationsDetails" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_93a64cae-271a-5e6b-8c83-5adf9f941142" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_Goodwill_93a64cae-271a-5e6b-8c83-5adf9f941142" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_4e5d7007-764c-d3cb-5dbd-3a33b1b3941c" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_4e5d7007-764c-d3cb-5dbd-3a33b1b3941c" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_31b59b3c-3561-f961-13ba-e3cc74150736" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_31b59b3c-3561-f961-13ba-e3cc74150736" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_de234906-4555-79c4-6c13-51f5af410421" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_de234906-4555-79c4-6c13-51f5af410421" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_95ec2852-df8b-d033-5d13-a8d506cf481d" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_95ec2852-df8b-d033-5d13-a8d506cf481d" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_5a23735a-10c2-64f7-3d5a-453792d1607d" xlink:type="locator"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_5a23735a-10c2-64f7-3d5a-453792d1607d" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_534c4147-6a9f-f763-f45b-0d025f929de9" xlink:type="locator"/>

<link:calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_534c4147-6a9f-f763-f45b-0d025f929de9" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_075b67f7-744f-57f0-72b0-182aaf115b56" xlink:type="locator"/>

<link:calculationArc order="8" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_075b67f7-744f-57f0-72b0-182aaf115b56" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_833b6d2d-a622-8759-6212-2a8447c58ff7" xlink:type="locator"/>

<link:calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_833b6d2d-a622-8759-6212-2a8447c58ff7" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_57d7961f-f1e1-2d4b-61e2-7b18314c757d" xlink:type="locator"/>

<link:calculationArc order="10" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_57d7961f-f1e1-2d4b-61e2-7b18314c757d" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_ab45d662-d92f-84fb-2ae9-0e4960fdcc79" xlink:type="locator"/>

<link:calculationArc order="11" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_ab45d662-d92f-84fb-2ae9-0e4960fdcc79" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_9481f0ea-bead-3f1d-7474-6ec0c6f5f2a6" xlink:type="locator"/>

<link:calculationArc order="12" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_9481f0ea-bead-3f1d-7474-6ec0c6f5f2a6" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLiabilitiesHeldForSale" xlink:label="loc_cohr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLiabilitiesHeldForSale_4C5F404F89D9B09B9F014A061CA71075" xlink:type="locator"/>

<link:calculationArc order="13" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_cohr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLiabilitiesHeldForSale_4C5F404F89D9B09B9F014A061CA71075" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt_73ac06cd-06ee-ff9c-c853-0c7d466897a7" xlink:type="locator"/>

<link:calculationArc order="14" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt_73ac06cd-06ee-ff9c-c853-0c7d466897a7" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_72cc2501-68a2-887c-26e3-e18106a6e94e" xlink:type="locator"/>

<link:calculationArc order="15" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_72cc2501-68a2-887c-26e3-e18106a6e94e" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_22355879-a922-e02e-8d98-a3c4d4cf8141" xlink:type="locator"/>

<link:calculationArc order="16" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_22355879-a922-e02e-8d98-a3c4d4cf8141" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetHeldForSaleCurrent" xlink:label="loc_cohr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetHeldForSaleCurrent_D59C4472D5179A3930E44A02CA32FC41" xlink:type="locator"/>

<link:calculationArc order="17" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_017de627-23c1-637c-52df-ee2eb736b728" xlink:to="loc_cohr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetHeldForSaleCurrent_D59C4472D5179A3930E44A02CA32FC41" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/BusinessCombinationsTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/CommitmentsAndContingencies" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/CommitmentsAndContingenciesOperatingLeasesDetails" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e7ae0c4b-54d0-1d15-1541-1fb5329d750c" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_5046b63b-148e-eb12-dd52-2a1e8f1e69c0" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e7ae0c4b-54d0-1d15-1541-1fb5329d750c" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_5046b63b-148e-eb12-dd52-2a1e8f1e69c0" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_483c5d20-89a2-da39-b56f-2ea722d97042" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e7ae0c4b-54d0-1d15-1541-1fb5329d750c" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_483c5d20-89a2-da39-b56f-2ea722d97042" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_b5a3356e-f555-ddd5-297a-b04afe0bfd5c" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e7ae0c4b-54d0-1d15-1541-1fb5329d750c" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_b5a3356e-f555-ddd5-297a-b04afe0bfd5c" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_6818de09-a032-5221-5ee6-896e1c2d0634" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e7ae0c4b-54d0-1d15-1541-1fb5329d750c" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_6818de09-a032-5221-5ee6-896e1c2d0634" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_56f89e4f-d247-3cf0-a749-00554ab475a6" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e7ae0c4b-54d0-1d15-1541-1fb5329d750c" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_56f89e4f-d247-3cf0-a749-00554ab475a6" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_fb0efb32-4bb1-57d0-236e-d8af81dc125f" xlink:type="locator"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e7ae0c4b-54d0-1d15-1541-1fb5329d750c" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_fb0efb32-4bb1-57d0-236e-d8af81dc125f" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/CommitmentsAndContingenciesPurchaseCommitmentsDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/CommitmentsAndContingenciesTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/ConsolidatedBalanceSheets" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_c3f7606a-e7e9-61d5-b60b-b4b059f68b26" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_us-gaap_CommonStockValue_c3f7606a-e7e9-61d5-b60b-b4b059f68b26" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_2d1b9d27-8b19-82d9-2843-5b3d292b7fbb" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_us-gaap_AdditionalPaidInCapital_2d1b9d27-8b19-82d9-2843-5b3d292b7fbb" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_04f0961a-a0bc-88cf-6658-3f950da4a458" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_04f0961a-a0bc-88cf-6658-3f950da4a458" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_065cb284-7fca-cc9b-5752-2feaf74d0011" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_065cb284-7fca-cc9b-5752-2feaf74d0011" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShorttermDebtFairValue" xlink:label="loc_us-gaap_ShorttermDebtFairValue_6bdd54ed-8fdb-7847-dd94-53b44c0aea37" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_ShorttermDebtFairValue_6bdd54ed-8fdb-7847-dd94-53b44c0aea37" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_7a72b51a-735c-1ad4-bd3f-d9bcf2d6a26d" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_AccountsPayableCurrent_7a72b51a-735c-1ad4-bd3f-d9bcf2d6a26d" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_bd3a7ae4-0e62-b7df-2312-729d1644863d" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_bd3a7ae4-0e62-b7df-2312-729d1644863d" xlink:type="arc"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_b4e6cca3-6c62-3e0a-6782-510b974f1199" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherLongTermDebtNoncurrent" xlink:label="loc_us-gaap_OtherLongTermDebtNoncurrent_a566b9af-ed15-cf94-c38e-abe51c07397a" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_OtherLongTermDebtNoncurrent_a566b9af-ed15-cf94-c38e-abe51c07397a" xlink:type="arc"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_f234998c-5e05-09d0-d53e-5c44423c97c0" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_058e01e4-b9a1-623e-29f5-1b5c79bf095a" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_CommitmentsAndContingencies_058e01e4-b9a1-623e-29f5-1b5c79bf095a" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_07da1db4-2708-4446-4250-1fdd5956185e" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_07da1db4-2708-4446-4250-1fdd5956185e" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestrictedCashCurrent" xlink:label="loc_us-gaap_RestrictedCashCurrent_2c642bd3-af0e-2712-c577-dff033ad00ba" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_RestrictedCashCurrent_2c642bd3-af0e-2712-c577-dff033ad00ba" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_3dfc2054-7ef3-a116-42e5-83130d5f5732" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_3dfc2054-7ef3-a116-42e5-83130d5f5732" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_dd7775cd-f4ab-5607-9b31-1ee98f605818" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_dd7775cd-f4ab-5607-9b31-1ee98f605818" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_7eab44cf-1ea1-ca2a-420f-21f7b5343fc3" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_InventoryNet_7eab44cf-1ea1-ca2a-420f-21f7b5343fc3" xlink:type="arc"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_2294e6a2-7bab-43ed-d02c-bdf73b8fa561" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_Currentassetsheldforsalepartofthediscontinuedoperations" xlink:label="loc_cohr_Currentassetsheldforsalepartofthediscontinuedoperations_3ffe03db-77c4-f419-c081-42d8de6a2629" xlink:type="locator"/>

<link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_cohr_Currentassetsheldforsalepartofthediscontinuedoperations_3ffe03db-77c4-f419-c081-42d8de6a2629" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_1944a381-5c4e-ce3c-9111-13ccd1c639db" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_1944a381-5c4e-ce3c-9111-13ccd1c639db" xlink:type="arc"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_Goodwill_93a64cae-271a-5e6b-8c83-5adf9f941142" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestrictedCashAndInvestmentsNoncurrent" xlink:label="loc_us-gaap_RestrictedCashAndInvestmentsNoncurrent_3ec21982-5910-da92-94e7-46475f11e9f6" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_RestrictedCashAndInvestmentsNoncurrent_3ec21982-5910-da92-94e7-46475f11e9f6" xlink:type="arc"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_9b27fab9-d497-627b-4cfb-6b585220b978" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_435f72c7-0f4e-47cb-a228-1fdf1a019a39" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_435f72c7-0f4e-47cb-a228-1fdf1a019a39" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_bce346aa-ba15-aeef-61ad-e8ce13a3f0b4" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_bce346aa-ba15-aeef-61ad-e8ce13a3f0b4" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RepaymentsOfLinesOfCredit" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_0e65f67a-86e3-c84f-fab4-e2c0fc4b175d" xlink:type="locator"/>

<link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_0e65f67a-86e3-c84f-fab4-e2c0fc4b175d" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_e5f1c7a4-b42a-8461-2001-b1f20e51b257" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_e5f1c7a4-b42a-8461-2001-b1f20e51b257" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_RepaymentsOfCapitalLeaseObligations" xlink:label="loc_cohr_RepaymentsOfCapitalLeaseObligations_886a7640-a836-c400-fa36-98f70a4f031c" xlink:type="locator"/>

<link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_cohr_RepaymentsOfCapitalLeaseObligations_886a7640-a836-c400-fa36-98f70a4f031c" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_Cashpaidtosubsidiariesminorityshareholders" xlink:label="loc_cohr_Cashpaidtosubsidiariesminorityshareholders_893ab44c-9abf-65b1-288e-42d8dddee661" xlink:type="locator"/>

<link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_cohr_Cashpaidtosubsidiariesminorityshareholders_893ab44c-9abf-65b1-288e-42d8dddee661" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_8a1490c4-32d9-5132-1fe2-2675a45abdae" xlink:type="locator"/>

<link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_8a1490c4-32d9-5132-1fe2-2675a45abdae" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_d59a921e-6301-0411-46e6-49b6a981f8a0" xlink:type="locator"/>

<link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_d59a921e-6301-0411-46e6-49b6a981f8a0" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_NetSettlementOfRestrictedCommonStock" xlink:label="loc_cohr_NetSettlementOfRestrictedCommonStock_9d6cace1-d434-2049-7139-42d8dde8823b" xlink:type="locator"/>

<link:calculationArc order="8" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_cohr_NetSettlementOfRestrictedCommonStock_9d6cace1-d434-2049-7139-42d8dde8823b" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_f19a6911-0ca9-0f7f-0ae8-f18c6d766244" xlink:type="locator"/>

<link:calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_f19a6911-0ca9-0f7f-0ae8-f18c6d766244" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_cf22d061-7c46-e185-574b-89b7ef77509e" xlink:type="locator"/>

<link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_cf22d061-7c46-e185-574b-89b7ef77509e" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ImpairmentOfLongLivedAssetsHeldForUse" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_32424e4b-3b4f-6262-5789-7226e08c0507" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_32424e4b-3b4f-6262-5789-7226e08c0507" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_DepreciationAndAmortizationNet" xlink:label="loc_cohr_DepreciationAndAmortizationNet_d3e94b98-fbd3-0676-a17b-42d8dc086f88" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_cohr_DepreciationAndAmortizationNet_d3e94b98-fbd3-0676-a17b-42d8dc086f88" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_IntangibleassetNETchangeduringtheperiod" xlink:label="loc_cohr_IntangibleassetNETchangeduringtheperiod_b49bb4ec-ac9e-36ad-2b72-98f70af92ba4" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_cohr_IntangibleassetNETchangeduringtheperiod_b49bb4ec-ac9e-36ad-2b72-98f70af92ba4" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount" xlink:label="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_d681e7b1-cc40-4557-22b2-152978425f95" xlink:type="locator"/>

<link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_d681e7b1-cc40-4557-22b2-152978425f95" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_e3eecf87-b290-4567-8a59-5b0a8e27c85b" xlink:type="locator"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_ShareBasedCompensation_e3eecf87-b290-4567-8a59-5b0a8e27c85b" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_68e10ff8-b323-b033-86bb-bb6c9af3232f" xlink:type="locator"/>

<link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_68e10ff8-b323-b033-86bb-bb6c9af3232f" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_88999971-796e-a544-2b43-0669ab932f8e" xlink:type="locator"/>

<link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_88999971-796e-a544-2b43-0669ab932f8e" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_Noncashrestructuringcharges" xlink:label="loc_cohr_Noncashrestructuringcharges_684CB1081FCBAACCBEB6A723F73FDA98" xlink:type="locator"/>

<link:calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_cohr_Noncashrestructuringcharges_684CB1081FCBAACCBEB6A723F73FDA98" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PensionExpenseReversalOfExpenseNoncash" xlink:label="loc_us-gaap_PensionExpenseReversalOfExpenseNoncash_5cadae92-a918-2590-1b7b-aa746b927ac3" xlink:type="locator"/>

<link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_PensionExpenseReversalOfExpenseNoncash_5cadae92-a918-2590-1b7b-aa746b927ac3" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherNoncashExpense" xlink:label="loc_us-gaap_OtherNoncashExpense_3943ec30-15aa-3a14-5596-f901a0dae382" xlink:type="locator"/>

<link:calculationArc order="11" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_OtherNoncashExpense_3943ec30-15aa-3a14-5596-f901a0dae382" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_dd4bfa5e-1979-c817-e8a9-371104c0d4f7" xlink:type="locator"/>

<link:calculationArc order="12" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_dd4bfa5e-1979-c817-e8a9-371104c0d4f7" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_bf3f9720-ba63-7ecd-52ae-e754a6f349db" xlink:type="locator"/>

<link:calculationArc order="13" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_bf3f9720-ba63-7ecd-52ae-e754a6f349db" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherCurrentAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_2dda25d5-7739-c1f6-acbf-76965aaf9644" xlink:type="locator"/>

<link:calculationArc order="14" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_2dda25d5-7739-c1f6-acbf-76965aaf9644" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_9c014c8e-ef65-6055-d342-3e048173d471" xlink:type="locator"/>

<link:calculationArc order="15" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_9c014c8e-ef65-6055-d342-3e048173d471" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_a8b6fe35-4809-bddf-7ef6-3144a6c89165" xlink:type="locator"/>

<link:calculationArc order="16" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_a8b6fe35-4809-bddf-7ef6-3144a6c89165" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxes" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_32a1f577-1984-0dba-8328-1c5c7b04d5c1" xlink:type="locator"/>

<link:calculationArc order="17" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_32a1f577-1984-0dba-8328-1c5c7b04d5c1" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherCurrentLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_cc375194-a38e-33da-b1f1-b2b16c2222e2" xlink:type="locator"/>

<link:calculationArc order="18" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_cc375194-a38e-33da-b1f1-b2b16c2222e2" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_5ffad1f9-ed26-c38a-cad9-7d2f16245ec2" xlink:type="locator"/>

<link:calculationArc order="19" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_5ffad1f9-ed26-c38a-cad9-7d2f16245ec2" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_41d34a64-5135-57ad-661a-9f86a4fee4f7" xlink:type="locator"/>

<link:calculationArc order="20" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_41d34a64-5135-57ad-661a-9f86a4fee4f7" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_94d761b7-b8f1-3ba3-90b8-1443c3232b73" xlink:type="locator"/>

<link:calculationArc order="21" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_94d761b7-b8f1-3ba3-90b8-1443c3232b73" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_fee12b15-6b42-6245-2e2f-ff030b98332c" xlink:type="locator"/>

<link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_fee12b15-6b42-6245-2e2f-ff030b98332c" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_f7ed6106-862d-edb5-3fd1-677e7651af64" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_f7ed6106-862d-edb5-3fd1-677e7651af64" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecurities" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecurities_9cebbd9b-269e-5a19-54b8-1c32e2660d83" xlink:type="locator"/>

<link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecurities_9cebbd9b-269e-5a19-54b8-1c32e2660d83" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_4beb4a13-125c-79a5-e70a-88872f47be70" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_4beb4a13-125c-79a5-e70a-88872f47be70" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_9d35c912-5b2d-89f7-eeb3-812a0511db5e" xlink:type="locator"/>

<link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_9d35c912-5b2d-89f7-eeb3-812a0511db5e" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_Proceedsfromsalesofdiscontinuedoperations" xlink:label="loc_cohr_Proceedsfromsalesofdiscontinuedoperations_EC7615A88CD1099401F934CCDF0BEC6C" xlink:type="locator"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_cohr_Proceedsfromsalesofdiscontinuedoperations_EC7615A88CD1099401F934CCDF0BEC6C" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleOfOtherAssetsInvestingActivities" xlink:label="loc_us-gaap_ProceedsFromSaleOfOtherAssetsInvestingActivities_24ed0e48-9c9c-5922-c409-f6dbe196e9a6" xlink:type="locator"/>

<link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_ProceedsFromSaleOfOtherAssetsInvestingActivities_24ed0e48-9c9c-5922-c409-f6dbe196e9a6" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_5eaab9ea-3795-2871-0d80-72b9662e37e6" xlink:type="locator"/>

<link:calculationArc order="8" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_5eaab9ea-3795-2871-0d80-72b9662e37e6" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_c2c196d6-13d0-2f1a-74ee-f582ca75b52c" xlink:type="locator"/>

<link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_c2c196d6-13d0-2f1a-74ee-f582ca75b52c" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_b0a3a0d3-8732-f4e7-3bda-ee235d574c3b" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_b0a3a0d3-8732-f4e7-3bda-ee235d574c3b" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_07da1db4-2708-4446-4250-1fdd5956185e" xlink:type="arc"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_b0a3a0d3-8732-f4e7-3bda-ee235d574c3b" xlink:to="loc_us-gaap_RestrictedCashCurrent_2c642bd3-af0e-2712-c577-dff033ad00ba" xlink:type="arc"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_b0a3a0d3-8732-f4e7-3bda-ee235d574c3b" xlink:to="loc_us-gaap_RestrictedCashAndInvestmentsNoncurrent_3ec21982-5910-da92-94e7-46475f11e9f6" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/ConsolidatedStatementsOfCashFlowsReconciliationOfCashCashEquivalentAndRestrictedCashReported" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:to="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2a6e77d2-a694-61f8-1c68-085fd849c780" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2a6e77d2-a694-61f8-1c68-085fd849c780" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_351eeed0-a987-88e4-c007-095f3644ffff" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2a6e77d2-a694-61f8-1c68-085fd849c780" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_351eeed0-a987-88e4-c007-095f3644ffff" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_6feed690-17e1-a928-d1c5-204f2faa570e" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2a6e77d2-a694-61f8-1c68-085fd849c780" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_6feed690-17e1-a928-d1c5-204f2faa570e" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_57e8ae74-d8b6-c629-9bee-2d0929cd3999" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2a6e77d2-a694-61f8-1c68-085fd849c780" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_57e8ae74-d8b6-c629-9bee-2d0929cd3999" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax_1d6e2363-a14e-03f2-6209-149a4c7858ba" xlink:type="locator"/>

<link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2a6e77d2-a694-61f8-1c68-085fd849c780" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax_1d6e2363-a14e-03f2-6209-149a4c7858ba" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperations" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_29cb4575-1df0-23a0-aea0-70de299da05c" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_29cb4575-1df0-23a0-aea0-70de299da05c" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperations_29cb4575-1df0-23a0-aea0-70de299da05c" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:to="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_aaae347c-fa91-e2c3-dd05-1b008b13fd0c" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:to="loc_us-gaap_GrossProfit_aaae347c-fa91-e2c3-dd05-1b008b13fd0c" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesRevenueNet" xlink:label="loc_us-gaap_SalesRevenueNet_ff017a48-8743-bfac-8af0-ca31401cb6de" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_aaae347c-fa91-e2c3-dd05-1b008b13fd0c" xlink:to="loc_us-gaap_SalesRevenueNet_ff017a48-8743-bfac-8af0-ca31401cb6de" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_a2b142e3-b3f3-b7b6-6428-5812971ab980" xlink:type="locator"/>

<link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_aaae347c-fa91-e2c3-dd05-1b008b13fd0c" xlink:to="loc_us-gaap_CostOfRevenue_a2b142e3-b3f3-b7b6-6428-5812971ab980" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_23a4428c-a5e3-3b9c-fc88-04ae5be27ab3" xlink:type="locator"/>

<link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:to="loc_us-gaap_OperatingExpenses_23a4428c-a5e3-3b9c-fc88-04ae5be27ab3" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_25ae5ce2-b413-b975-9a84-c7503d2496cf" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_23a4428c-a5e3-3b9c-fc88-04ae5be27ab3" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_25ae5ce2-b413-b975-9a84-c7503d2496cf" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_29ad42f4-24c5-90ea-4492-fdb757d66249" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_23a4428c-a5e3-3b9c-fc88-04ae5be27ab3" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_29ad42f4-24c5-90ea-4492-fdb757d66249" xlink:type="arc"/>

<link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_23a4428c-a5e3-3b9c-fc88-04ae5be27ab3" xlink:to="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_d681e7b1-cc40-4557-22b2-152978425f95" xlink:type="arc"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_23a4428c-a5e3-3b9c-fc88-04ae5be27ab3" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_32424e4b-3b4f-6262-5789-7226e08c0507" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_AmortizationofintangibleassetsotherthanCOGS" xlink:label="loc_cohr_AmortizationofintangibleassetsotherthanCOGS_f21ab003-d462-6a48-35b8-98f70a7a9fac" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_23a4428c-a5e3-3b9c-fc88-04ae5be27ab3" xlink:to="loc_cohr_AmortizationofintangibleassetsotherthanCOGS_f21ab003-d462-6a48-35b8-98f70a7a9fac" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_9b894abb-bf85-2810-9d9d-c92a9b0f56f1" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_9b894abb-bf85-2810-9d9d-c92a9b0f56f1" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InvestmentIncomeNonoperating" xlink:label="loc_us-gaap_InvestmentIncomeNonoperating_6d011e0e-8a4d-ead4-8ae2-208e1f9abb48" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_9b894abb-bf85-2810-9d9d-c92a9b0f56f1" xlink:to="loc_us-gaap_InvestmentIncomeNonoperating_6d011e0e-8a4d-ead4-8ae2-208e1f9abb48" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_7c9599ab-2a77-022c-c720-63fecff6a62c" xlink:type="locator"/>

<link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_9b894abb-bf85-2810-9d9d-c92a9b0f56f1" xlink:to="loc_us-gaap_InterestExpense_7c9599ab-2a77-022c-c720-63fecff6a62c" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_250c3b2f-7db5-7088-68cc-1dd831a2c2d7" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_9b894abb-bf85-2810-9d9d-c92a9b0f56f1" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_250c3b2f-7db5-7088-68cc-1dd831a2c2d7" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="locator"/>

<link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperations_29cb4575-1df0-23a0-aea0-70de299da05c" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_b9914cca-4860-d701-8b49-ae2910ad372f" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_b9914cca-4860-d701-8b49-ae2910ad372f" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/ConsolidatedStatementsOfStockholdersEquity" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/DefinedBenefitPlansDetails" xlink:type="extended">

<link:loc xlink:href="cohr-20180929.xsd#cohr_Totalexpectedfuturepaymentdefinedbenefitplan" xlink:label="loc_cohr_Totalexpectedfuturepaymentdefinedbenefitplan_B4310991CF29528D7720C2475E75CDE9" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_61f99baf-2e2e-7734-34d6-fdfb58ec72b1" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Totalexpectedfuturepaymentdefinedbenefitplan_B4310991CF29528D7720C2475E75CDE9" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_61f99baf-2e2e-7734-34d6-fdfb58ec72b1" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_491bdf72-e48d-d93d-15fd-298b8c0962fd" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Totalexpectedfuturepaymentdefinedbenefitplan_B4310991CF29528D7720C2475E75CDE9" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_491bdf72-e48d-d93d-15fd-298b8c0962fd" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_72f4cc60-1fab-87d2-c357-f41170f1ebec" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Totalexpectedfuturepaymentdefinedbenefitplan_B4310991CF29528D7720C2475E75CDE9" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_72f4cc60-1fab-87d2-c357-f41170f1ebec" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_0ca28599-5e6a-395d-7e18-1a21fe279b2d" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Totalexpectedfuturepaymentdefinedbenefitplan_B4310991CF29528D7720C2475E75CDE9" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_0ca28599-5e6a-395d-7e18-1a21fe279b2d" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_74e584c7-c3f7-79da-54c6-11b4a4d425a3" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Totalexpectedfuturepaymentdefinedbenefitplan_B4310991CF29528D7720C2475E75CDE9" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_74e584c7-c3f7-79da-54c6-11b4a4d425a3" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_e63be1ed-de25-918d-80d5-3ff9be220c96" xlink:type="locator"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_Totalexpectedfuturepaymentdefinedbenefitplan_B4310991CF29528D7720C2475E75CDE9" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_e63be1ed-de25-918d-80d5-3ff9be220c96" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bae25320-9d69-b27b-4684-0b60368d617f" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_89ad3af5-a7a9-a0b6-3ed0-1824210c7a90" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bae25320-9d69-b27b-4684-0b60368d617f" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_89ad3af5-a7a9-a0b6-3ed0-1824210c7a90" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_50406d00-3746-2e05-3a50-4b2bf529ff14" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bae25320-9d69-b27b-4684-0b60368d617f" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_50406d00-3746-2e05-3a50-4b2bf529ff14" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_053c4475-6836-cf00-1abe-b15f58110eab" xlink:type="locator"/>

<link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bae25320-9d69-b27b-4684-0b60368d617f" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_053c4475-6836-cf00-1abe-b15f58110eab" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_56d3b160-c01b-cfdb-dbe6-522e038983dc" xlink:type="locator"/>

<link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bae25320-9d69-b27b-4684-0b60368d617f" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_56d3b160-c01b-cfdb-dbe6-522e038983dc" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_d4ab2dfc-332f-2b61-eed0-e7768c03abb7" xlink:type="locator"/>

<link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bae25320-9d69-b27b-4684-0b60368d617f" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_d4ab2dfc-332f-2b61-eed0-e7768c03abb7" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments_a2b01ebf-3bb0-69b6-bb1a-f9cc09a597fb" xlink:type="locator"/>

<link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bae25320-9d69-b27b-4684-0b60368d617f" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments_a2b01ebf-3bb0-69b6-bb1a-f9cc09a597fb" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/DefinedBenefitPlansNotes" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/DefinedBenefitPlansTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/DeiDocument" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/DerivativeInstrumentsAndHedgingActivities" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/DerivativeInstrumentsAndHedgingActivitiesNotionalAndFairValueDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/DerivativeInstrumentsAndHedgingActivitiesTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/DescriptionOfBusiness" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/DiscontinuedOperationsAndSaleOfAssetsHeldForSale" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/DiscontinuedOperationsAndSaleOfAssetsHeldForSaleDetails" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_32c54ca2-f88f-2005-cf94-b5bd005ce559" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_b9914cca-4860-d701-8b49-ae2910ad372f" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_32c54ca2-f88f-2005-cf94-b5bd005ce559" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_6f26a1f5-a97c-1fb5-0562-a523a7daa9d9" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_32c54ca2-f88f-2005-cf94-b5bd005ce559" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_6f26a1f5-a97c-1fb5-0562-a523a7daa9d9" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_baf1e750-e749-4289-93f6-efc39cd01e57" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_6f26a1f5-a97c-1fb5-0562-a523a7daa9d9" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_baf1e750-e749-4289-93f6-efc39cd01e57" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_6ed3198a-b6ad-452b-3292-82b8bec39b76" xlink:type="locator"/>

<link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_6f26a1f5-a97c-1fb5-0562-a523a7daa9d9" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_6ed3198a-b6ad-452b-3292-82b8bec39b76" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_DisposalGroupIncludingDiscontinuedOperationOperatingExpenses1" xlink:label="loc_cohr_DisposalGroupIncludingDiscontinuedOperationOperatingExpenses1_D6A7A056FB6A532C0DEF0A05B3CC7B1C" xlink:type="locator"/>

<link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_6f26a1f5-a97c-1fb5-0562-a523a7daa9d9" xlink:to="loc_cohr_DisposalGroupIncludingDiscontinuedOperationOperatingExpenses1_D6A7A056FB6A532C0DEF0A05B3CC7B1C" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_DisposalGroupIncludingDiscontinuedOperationOtherExpenses1" xlink:label="loc_cohr_DisposalGroupIncludingDiscontinuedOperationOtherExpenses1_3F9163BAD21641BD7EC70A070D6FF53B" xlink:type="locator"/>

<link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_6f26a1f5-a97c-1fb5-0562-a523a7daa9d9" xlink:to="loc_cohr_DisposalGroupIncludingDiscontinuedOperationOtherExpenses1_3F9163BAD21641BD7EC70A070D6FF53B" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_75fb9940-bd63-976c-4153-3fd85df1949d" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_32c54ca2-f88f-2005-cf94-b5bd005ce559" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_75fb9940-bd63-976c-4153-3fd85df1949d" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_64dfb8a3-e793-00fc-3cb3-ad8751b1d684" xlink:type="locator"/>

<link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_b9914cca-4860-d701-8b49-ae2910ad372f" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_64dfb8a3-e793-00fc-3cb3-ad8751b1d684" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/DiscontinuedOperationsAndSaleOfAssetsHeldForSaleTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlans" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansDeferredCompensationPlansDetails" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_f851478e-1c36-7401-4085-25f84335d8aa" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredCompensationLiabilityCurrent" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrent_ec759f46-b168-4738-0fba-9f5b5ab469e3" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_f851478e-1c36-7401-4085-25f84335d8aa" xlink:to="loc_us-gaap_DeferredCompensationLiabilityCurrent_ec759f46-b168-4738-0fba-9f5b5ab469e3" xlink:type="arc"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_f851478e-1c36-7401-4085-25f84335d8aa" xlink:to="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_13bb68ff-220d-fc94-a876-04b8f3aef199" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredCompensationPlanAssets" xlink:label="loc_us-gaap_DeferredCompensationPlanAssets_c5e8e545-d184-736b-7221-b1f3df7f1e36" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashSurrenderValueOfLifeInsurance" xlink:label="loc_us-gaap_CashSurrenderValueOfLifeInsurance_b7606113-74da-caf3-5d0c-c03094b9e921" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredCompensationPlanAssets_c5e8e545-d184-736b-7221-b1f3df7f1e36" xlink:to="loc_us-gaap_CashSurrenderValueOfLifeInsurance_b7606113-74da-caf3-5d0c-c03094b9e921" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_MutualFunds" xlink:label="loc_cohr_MutualFunds_59e1879e-7876-5f5a-3397-98f70ad1672b" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredCompensationPlanAssets_c5e8e545-d184-736b-7221-b1f3df7f1e36" xlink:to="loc_cohr_MutualFunds_59e1879e-7876-5f5a-3397-98f70ad1672b" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansEmployeeRetirementAndInvestmentAndStockPurchasePlansDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansFairValueOfStockCompensationDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansStockCompensationExpenseDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansStockOptionPlansDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansStockOptionsAndAwardsActivityDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/EmployeeStockAwardAndBenefitPlansTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/FairValues" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/FairValuesDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/FairValuesTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/GoodwillAndIntangibleAssets" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/GoodwillAndIntangibleAssetsGoodwillDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/GoodwillAndIntangibleAssetsIntangibleAssetsDetails" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_49187b45-82fd-7060-b114-79ff249a4331" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_5d62e128-f1a1-954f-82e2-1936cb67d793" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_49187b45-82fd-7060-b114-79ff249a4331" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_5d62e128-f1a1-954f-82e2-1936cb67d793" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c3ed8a56-abe0-6418-c541-e6b647d6318a" xlink:type="locator"/>

<link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_49187b45-82fd-7060-b114-79ff249a4331" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c3ed8a56-abe0-6418-c541-e6b647d6318a" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_FiniteLivedIntangibleAssetsexcludingIPRDNet" xlink:label="loc_cohr_FiniteLivedIntangibleAssetsexcludingIPRDNet_570D797FD7DE80FED9FAC7178FA1B1DF" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_c918d4cb-4462-72da-1198-39107cb9581b" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_FiniteLivedIntangibleAssetsexcludingIPRDNet_570D797FD7DE80FED9FAC7178FA1B1DF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_c918d4cb-4462-72da-1198-39107cb9581b" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_e44a1606-1eda-278a-1c39-e2fcbf96f248" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_FiniteLivedIntangibleAssetsexcludingIPRDNet_570D797FD7DE80FED9FAC7178FA1B1DF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_e44a1606-1eda-278a-1c39-e2fcbf96f248" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_6a8745e2-e4b9-1a92-2a4b-72abaf326824" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_FiniteLivedIntangibleAssetsexcludingIPRDNet_570D797FD7DE80FED9FAC7178FA1B1DF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_6a8745e2-e4b9-1a92-2a4b-72abaf326824" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_ceebb9d8-94b3-173f-0af1-6bad40ca326c" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_FiniteLivedIntangibleAssetsexcludingIPRDNet_570D797FD7DE80FED9FAC7178FA1B1DF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_ceebb9d8-94b3-173f-0af1-6bad40ca326c" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_b5e743d1-f009-54c0-57f0-4a30eb0e9bab" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_FiniteLivedIntangibleAssetsexcludingIPRDNet_570D797FD7DE80FED9FAC7178FA1B1DF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_b5e743d1-f009-54c0-57f0-4a30eb0e9bab" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_f98b1772-f2e7-e86d-8181-c87649b7a914" xlink:type="locator"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cohr_FiniteLivedIntangibleAssetsexcludingIPRDNet_570D797FD7DE80FED9FAC7178FA1B1DF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_f98b1772-f2e7-e86d-8181-c87649b7a914" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/GoodwillAndIntangibleAssetsTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/IncomeTaxes" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/IncomeTaxesContingencyDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/IncomeTaxesDetails" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_b361a033-37cf-a2bc-6e1f-0297b90aa5a9" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsNet" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_d74724c2-178d-7f3f-8e86-5f5ba690672c" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_b361a033-37cf-a2bc-6e1f-0297b90aa5a9" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_d74724c2-178d-7f3f-8e86-5f5ba690672c" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsGross" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_40f9cbe3-f1cd-d4d3-e7be-f62e64714b00" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_d74724c2-178d-7f3f-8e86-5f5ba690672c" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_40f9cbe3-f1cd-d4d3-e7be-f62e64714b00" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals_e56405b8-dd11-954e-a13b-53d9b95e2621" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_40f9cbe3-f1cd-d4d3-e7be-f62e64714b00" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals_e56405b8-dd11-954e-a13b-53d9b95e2621" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_3541201a-a025-b00d-aec1-2cb167bdef44" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_40f9cbe3-f1cd-d4d3-e7be-f62e64714b00" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_3541201a-a025-b00d-aec1-2cb167bdef44" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsDeferredIncome" xlink:label="loc_us-gaap_DeferredTaxAssetsDeferredIncome_d5bdadc0-cf22-f4bf-e68b-7f9b7b17d502" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_40f9cbe3-f1cd-d4d3-e7be-f62e64714b00" xlink:to="loc_us-gaap_DeferredTaxAssetsDeferredIncome_d5bdadc0-cf22-f4bf-e68b-7f9b7b17d502" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsInventory" xlink:label="loc_us-gaap_DeferredTaxAssetsInventory_211f9603-61ca-7ef7-2141-bb8ed157e3f6" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_40f9cbe3-f1cd-d4d3-e7be-f62e64714b00" xlink:to="loc_us-gaap_DeferredTaxAssetsInventory_211f9603-61ca-7ef7-2141-bb8ed157e3f6" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_f7e9e6da-5d57-5f97-5d33-52f319506ef0" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_40f9cbe3-f1cd-d4d3-e7be-f62e64714b00" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_f7e9e6da-5d57-5f97-5d33-52f319506ef0" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther_5fb8f790-e7af-376b-240e-0fd4bba0c990" xlink:type="locator"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_40f9cbe3-f1cd-d4d3-e7be-f62e64714b00" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther_5fb8f790-e7af-376b-240e-0fd4bba0c990" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_DeferredTaxAssetsDepreciationAndAmortization" xlink:label="loc_cohr_DeferredTaxAssetsDepreciationAndAmortization_195852b6-4e50-7b4a-ab81-98f70aef0428" xlink:type="locator"/>

<link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_40f9cbe3-f1cd-d4d3-e7be-f62e64714b00" xlink:to="loc_cohr_DeferredTaxAssetsDepreciationAndAmortization_195852b6-4e50-7b4a-ab81-98f70aef0428" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsOther" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_91623f44-5f42-408a-f7b7-7a4698afab83" xlink:type="locator"/>

<link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_40f9cbe3-f1cd-d4d3-e7be-f62e64714b00" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_91623f44-5f42-408a-f7b7-7a4698afab83" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_46929883-d93f-69b0-5ded-4c800feeb57f" xlink:type="locator"/>

<link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_d74724c2-178d-7f3f-8e86-5f5ba690672c" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_46929883-d93f-69b0-5ded-4c800feeb57f" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="loc_us-gaap_DeferredTaxLiabilities_644ceb1c-07ef-6a89-f014-9d7b5dfbc918" xlink:type="locator"/>

<link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_b361a033-37cf-a2bc-6e1f-0297b90aa5a9" xlink:to="loc_us-gaap_DeferredTaxLiabilities_644ceb1c-07ef-6a89-f014-9d7b5dfbc918" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_DeferredTaxLiabilitiesGainsOnIissuanceOfStockBySubsidiary" xlink:label="loc_cohr_DeferredTaxLiabilitiesGainsOnIissuanceOfStockBySubsidiary_c6c9451a-9f1a-32f6-f4c1-98f709c33c32" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_644ceb1c-07ef-6a89-f014-9d7b5dfbc918" xlink:to="loc_cohr_DeferredTaxLiabilitiesGainsOnIissuanceOfStockBySubsidiary_c6c9451a-9f1a-32f6-f4c1-98f709c33c32" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_DeferredTaxLiabilitiesDepreciationAndAmortization" xlink:label="loc_cohr_DeferredTaxLiabilitiesDepreciationAndAmortization_46198935-418a-be08-4ee9-98f70a4fe949" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_644ceb1c-07ef-6a89-f014-9d7b5dfbc918" xlink:to="loc_cohr_DeferredTaxLiabilitiesDepreciationAndAmortization_46198935-418a-be08-4ee9-98f70a4fe949" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains_eb6e9256-3154-3910-e4da-85f5f1b053b1" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_644ceb1c-07ef-6a89-f014-9d7b5dfbc918" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains_eb6e9256-3154-3910-e4da-85f5f1b053b1" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_40c7d4a7-f1a1-0c55-497e-f9a3bb09604c" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_644ceb1c-07ef-6a89-f014-9d7b5dfbc918" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_40c7d4a7-f1a1-0c55-497e-f9a3bb09604c" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_684e73bc-c774-15b7-cfc4-307e06892c2e" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_684e73bc-c774-15b7-cfc4-307e06892c2e" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_77aad584-eda7-6ab9-9bf4-262b9a6dd394" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_77aad584-eda7-6ab9-9bf4-262b9a6dd394" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f75d01b7-d271-b07d-c4a7-6ae60293303d" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f75d01b7-d271-b07d-c4a7-6ae60293303d" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_15bb8413-7c16-05ff-0f24-330007bd87a4" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f75d01b7-d271-b07d-c4a7-6ae60293303d" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_15bb8413-7c16-05ff-0f24-330007bd87a4" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_40691c72-4a6d-af64-c37e-f5abe38c6165" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f75d01b7-d271-b07d-c4a7-6ae60293303d" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_40691c72-4a6d-af64-c37e-f5abe38c6165" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_67cd26b3-6ceb-499c-0dd8-da28cd1ddfc3" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f75d01b7-d271-b07d-c4a7-6ae60293303d" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_67cd26b3-6ceb-499c-0dd8-da28cd1ddfc3" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_d2250640-c0ab-3b70-41b7-136d9a4aad78" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_d2250640-c0ab-3b70-41b7-136d9a4aad78" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_36ba223a-0466-98b6-2d31-f243492419f9" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_d2250640-c0ab-3b70-41b7-136d9a4aad78" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_36ba223a-0466-98b6-2d31-f243492419f9" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_10028fc1-eee3-03f5-6f20-ff5d85e3c0b2" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_d2250640-c0ab-3b70-41b7-136d9a4aad78" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_10028fc1-eee3-03f5-6f20-ff5d85e3c0b2" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_7d48046d-7441-0899-53b0-aaa1e573540a" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_d2250640-c0ab-3b70-41b7-136d9a4aad78" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_7d48046d-7441-0899-53b0-aaa1e573540a" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/IncomeTaxesDetailsCalc2" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_CE4C300085440067563B33693F011E70_16f0a3f7-750c-3f06-7b05-d8ae2aae120b" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_CE4C300085440067563B33693F011E70_16f0a3f7-750c-3f06-7b05-d8ae2aae120b" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_CE4C300085440067563B33693F011E70_5a4be234-601b-ead6-df60-5106285cb5b9" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_CE4C300085440067563B33693F011E70_5a4be234-601b-ead6-df60-5106285cb5b9" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential" xlink:label="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_CE4C300085440067563B33693F011E70_6f58335b-7001-079c-017e-8c9f80193d1b" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_CE4C300085440067563B33693F011E70_6f58335b-7001-079c-017e-8c9f80193d1b" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_CE4C300085440067563B33693F011E70_553df36e-9753-8848-960f-086f1d52da7b" xlink:type="locator"/>

<link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_CE4C300085440067563B33693F011E70_553df36e-9753-8848-960f-086f1d52da7b" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_CE4C300085440067563B33693F011E70_bdbdc685-443d-bab4-6ccc-ce6a14aaa242" xlink:type="locator"/>

<link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_CE4C300085440067563B33693F011E70_bdbdc685-443d-bab4-6ccc-ce6a14aaa242" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_CE4C300085440067563B33693F011E70_6179e78e-0795-e810-10f3-c0eb0a943e7b" xlink:type="locator"/>

<link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_CE4C300085440067563B33693F011E70_6179e78e-0795-e810-10f3-c0eb0a943e7b" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxReconciliationTaxCreditsForeign" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxCreditsForeign_CE4C300085440067563B33693F011E70_25622969-c5f4-b122-c538-38930e13e72a" xlink:type="locator"/>

<link:calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxCreditsForeign_CE4C300085440067563B33693F011E70_25622969-c5f4-b122-c538-38930e13e72a" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense_CE4C300085440067563B33693F011E70_eeed1f64-93f9-04e3-8914-bc5f0c1cd48b" xlink:type="locator"/>

<link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense_CE4C300085440067563B33693F011E70_eeed1f64-93f9-04e3-8914-bc5f0c1cd48b" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_Reversalofcompetentauthority" xlink:label="loc_cohr_Reversalofcompetentauthority_CE4C300085440067563B33693F011E70_19b6da22-6ed6-cd2d-0a16-98f70a276553" xlink:type="locator"/>

<link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_cohr_Reversalofcompetentauthority_CE4C300085440067563B33693F011E70_19b6da22-6ed6-cd2d-0a16-98f70a276553" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_CE4C300085440067563B33693F011E70_0b1d9c48-50e9-fd05-543d-8637e0170a2a" xlink:type="locator"/>

<link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_CE4C300085440067563B33693F011E70_0b1d9c48-50e9-fd05-543d-8637e0170a2a" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxReconciliationTaxCreditsResearch" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxCreditsResearch_CE4C300085440067563B33693F011E70_dae4c6cc-5e4f-e8ac-846e-00b9cc00facc" xlink:type="locator"/>

<link:calculationArc order="11" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxCreditsResearch_CE4C300085440067563B33693F011E70_dae4c6cc-5e4f-e8ac-846e-00b9cc00facc" xlink:type="arc"/>

<link:loc xlink:href="cohr-20180929.xsd#cohr_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount" xlink:label="loc_cohr_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount_CE4C300085440067563B33693F011E70_EC864209B5B046FDA468EFDAC06CF517" xlink:type="locator"/>

<link:calculationArc order="12" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_CE4C300085440067563B33693F011E70_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:to="loc_cohr_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount_CE4C300085440067563B33693F011E70_EC864209B5B046FDA468EFDAC06CF517" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/IncomeTaxesTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/OtherIncomeExpenseNet" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/OtherIncomeExpenseNetDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/OtherIncomeExpenseNetTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/QuarterlyFinancialInformationUnaudited" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/QuarterlyFinancialInformationUnauditedDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/RestructuringChargesDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/RestructuringChargesNotes" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/RestructuringChargesTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SegmentAndGeographicInformation" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SegmentAndGeographicInformationDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SegmentAndGeographicInformationRevenueAndLongLivedAssetsByGeographicalAreasDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SegmentAndGeographicInformationTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/ShortTermInvestments" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/ShortTermInvestmentsDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/ShortTermInvestmentsTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPolicies" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesAccountsReceivableAllowancesDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesAssetRetirementObligationsDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesComprehensiveIncomeLossDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesEarningsPerShareDetails" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_223fd9c8-68e8-e433-7c40-f98b238e79de" xlink:type="locator"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_86e61cf2-b7b2-e230-65f1-5a2b152f3a30" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_223fd9c8-68e8-e433-7c40-f98b238e79de" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_86e61cf2-b7b2-e230-65f1-5a2b152f3a30" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_cee10fe8-a4bb-491c-22f6-69a723d6a718" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_223fd9c8-68e8-e433-7c40-f98b238e79de" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_cee10fe8-a4bb-491c-22f6-69a723d6a718" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesFiscalYearBasisOfPresentationCashEquivalentsAndConcentrationOfCreditRiskDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesIncomeTaxesDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesIntangibleAssetsDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesInventoriesDetails" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves" xlink:label="loc_us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves_87f7376c-2252-d305-9af9-9216bed6c446" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_7eab44cf-1ea1-ca2a-420f-21f7b5343fc3" xlink:to="loc_us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves_87f7376c-2252-d305-9af9-9216bed6c446" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InventoryWorkInProcessNetOfReserves" xlink:label="loc_us-gaap_InventoryWorkInProcessNetOfReserves_a3451b87-a72a-9fff-128b-969b95aecb3a" xlink:type="locator"/>

<link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_7eab44cf-1ea1-ca2a-420f-21f7b5343fc3" xlink:to="loc_us-gaap_InventoryWorkInProcessNetOfReserves_a3451b87-a72a-9fff-128b-969b95aecb3a" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_b077ba6e-d590-fd28-6cc4-ab52e924ed70" xlink:type="locator"/>

<link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_7eab44cf-1ea1-ca2a-420f-21f7b5343fc3" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_b077ba6e-d590-fd28-6cc4-ab52e924ed70" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesLongLivedAssetsDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesNewAccountingPronouncementsDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesPolicies" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesPropertyAndEquipmentDetails" xlink:type="extended">

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_fe5a8e8b-5934-3dc5-9dae-7d40983185cf" xlink:type="locator"/>

<link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_1944a381-5c4e-ce3c-9111-13ccd1c639db" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_fe5a8e8b-5934-3dc5-9dae-7d40983185cf" xlink:type="arc"/>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5551841b-83e0-4644-fca8-d4027d932c0a" xlink:type="locator"/>

<link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_1944a381-5c4e-ce3c-9111-13ccd1c639db" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5551841b-83e0-4644-fca8-d4027d932c0a" xlink:type="arc"/>

</link:calculationLink>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesResearchAndDevelopmentDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesTables" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SignificantAccountingPoliciesWarrantyReservesDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/StockRepurchases" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/StockRepurchasesDetails" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SubsequentEvents" xlink:type="extended"/>

<link:calculationLink xlink:role="http://www.coherent.com/role/SubsequentEventsDetails" xlink:type="extended"/>

</link:linkbase>

6 Subsequent Filings that Reference this Filing

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 8/29/22  Coherent Corp.                    10-K        6/30/22  117:15M
 7/01/22  Coherent Corp.                    8-K:1,2,3,5 7/01/22   14:1.8M                                   Donnelley … Solutions/FA
12/27/21  Coherent Inc.                     10-K/A     10/02/21   12:1.4M                                   Toppan Merrill/FA
11/30/21  Coherent Inc.                     10-K       10/02/21  135:16M
 2/01/21  Coherent Inc.                     10-K/A     10/03/20   16:2M                                     Toppan Merrill/FA
12/01/20  Coherent Inc.                     10-K       10/03/20  139:16M

↑Top

Filing Submission 0000021510-18-000029 – Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

Coherent Inc – ‘10-K’ for 9/29/18 – ‘EX-101.CAL’

On: Tuesday, 11/27/18, at 4:15pm ET · For: 9/29/18 · Accession #: 21510-18-29 · File #: 1-33962

Annual Report — Form 10-K — Sect. 13 / 15(d) – SEA’34Filing Table of Contents

‘EX-101.CAL’ — XBRL Calculations — cohr-20180929_cal

This Exhibit is an XBRL XML File.

6 Subsequent Filings that Reference this Filing

Annual Report — Form 10-K — Sect. 13 / 15(d) – SEA’34
Filing Table of Contents