FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

AMBROSEO JOHN 		2. Issuer Name and Ticker or Trading Symbol

COHERENT INC [ COHR ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Pres. and CEO
(Last)          (First)          (Middle)

PATRICK HENRY DRIVE 		3. Date of Earliest Transaction (MM/DD/YYYY)

11/13/2018
(Street)

SANTA CLARA, CA 95054
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   11/13/2018     M    5500   (1) A $0.00   132917   I   Family Trust  
Common Stock   11/13/2018     F    2727   (2) D $123.26   130190   I   Family Trust  
Common Stock   11/13/2018     M    34250   (1) A $0.00   164440   I   Family Trust  
Common Stock   11/13/2018     A    34250   (1) (3) A $0.00   198690   I   Family Trust  
Common Stock   11/13/2018     F    33963   (2) D $123.26   164727   I   Family Trust  
Common Stock   11/13/2018     G   V 7400   D $0.00   157327   I   Family Trust  
Common Stock   11/13/2018     A    11472   (4) A $0.00   16466   (5) D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units   $0.00   11/13/2018     M         5500    11/13/2018   11/13/2018   Common Stock   5500   $0.00   78169   D    
Performance Restricted Stock Units   $0.00   11/13/2018     M         34250      (6) 11/13/2018   Common Stock   34250   $0.00   43919   D    
Performance Restricted Stock Units   $0.00   11/13/2018     A      22499         (7) 11/13/2021   Common Stock   22499   $0.00   22499   D    

Explanation of Responses:
(1)  Released shares issued to family trust.
(2)  Represents shares withheld to satisfy minimum tax withholding obligations for released restricted stock units.
(3)  Additional shares acquired pursuant to the maximum achievement of the performance criteria beyond the target number, as described in footnote (5) on Table II.
(4)  On November 13, 2018 the Reporting Person was granted 11,472 Restricted Stock Units which will vest in three equal installments on each of November 13, 2019, November 13, 2020 and November 13, 2021.
(5)  Includes 16,466 Restricted Stock Units.
(6)  This Performance Restricted Stock Unit award vested on the three year anniversary of the grant based on the relative performance of the underlying stock versus the Russell 2000 Index for the 90 trading days on and prior to November 13, 2018 versus the same 90 trading day period ending November 13, 2015. The number of shares in the table reflects the target number of achieved RSUs. The actual range of RSUs was 0-200% of the target number, depending upon the achievement results at the measurement date.
(7)  This Performance Restricted Stock Unit award vests after the three year anniversary of the grant based on the relative performance of the underlying stock versus the Russell 1000 Index for the 90 trading days on and prior to November 13, 2021 versus the same 90 trading day period ending November 13, 2018. The number of shares in the table reflects the number of RSUs at target. The actual range of RSUs is 0-200% of the target number, depending upon what achievement, if any, results at the measurement date.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
AMBROSEO JOHN
PATRICK HENRY DRIVE
SANTA CLARA, CA 95054 		X
Pres. and CEO

Signatures
/s/ Rhonda Fassbender, pursuant to Power of Attorney 11/15/2018
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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