## SIGNATURES 

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. 

Date: November 26, 2019 

COHERENT, INC. /s/ JOHN R. AMBROSEO By: John R. Ambroseo President and Chief Executive Officer 

## POWER OF ATTORNEY 

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints John R. Ambroseo and Kevin S. Palatnik, and each of them individually, as his attorney-in-fact, each with full power of substitution, for him in any and all capacities to sign any and all amendments to this annual report on Form 10-K, and to file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that said attorney-in-fact, or his or her substitute, may do or cause to be done by virtue hereof. 

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated: 

/s/ JOHN R. AMBROSEO John R. Ambroseo (Director and Principal Executive Officer) 

/s/ KEVIN S. PALATNIK Kevin S. Palatnik (Principal Financial and Accounting Officer) 

/s/ BEVERLY KAY MATTHEWS Beverly Kay Matthews (Director) 

/s/ MICHAEL R. MCMULLEN Michael R. McMullen (Director) 

/s/ JAY T. FLATLEY Jay T. Flatley (Director) 

/s/ PAMELA FLETCHER Pamela Fletcher (Director) 

/s/ SUSAN M. JAMES Susan M. James (Director) 

/s/ GARRY W. ROGERSON Garry W. Rogerson (Director) 

/s/ STEVE SKAGGS Steve Skaggs (Director) 

/s/ SANDEEP VIJ Sandeep Vij (Director) 

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