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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Sechrist Paul F   2. Issuer Name and Ticker or Trading Symbol COHERENT INC [COHR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) EVP Worldwide Sales & Services (Last) (First) (Middle) 5100 PATRICK HENRY DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 12/01/2017 (Street) SANTA CLARA, CA 95054 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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               8,816 (1) I Family Trust Common Stock 12/01/2017   S   900 (2) D $ 279.1511 (3) 7,916 I Family Trust Common Stock 12/01/2017   S   1,612 (2) D $ 280.0448 (4) 6,304 I Family Trust Common Sock 12/01/2017   S   1,306 (2) D $ 280.8286 (5) 4,998 I Family Trust Common Stock 12/01/2017   S   1,200 (2) D $ 282.6825 (6) 3,798 I Family Trust Common Stock 12/01/2017   S   800 (2) D $ 284.9513 (7) 2,998 I Family Trust Common Stock 12/01/2017   S   400 (2) D $ 285.76 (8) 2,598 I Family Trust

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction 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 (Month/Day/Year)

7. Title and Amount of Underlying Securities (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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Sechrist Paul F 5100 PATRICK HENRY DRIVE SANTA CLARA, CA 95054			EVP Worldwide Sales & Services

Signatures

/s/ Paul Sechrist		12/05/2017
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Holding reflects exempt transfer of Shares by Reporting Person from a Direct Holding to an Indirect Holding in the Sechrist Family Trust of which the Reporting Person is a Trustee.
(2)	Sold Pursuant to a Rule 10b5-1 sales plan adopted on August 31, 2017.
(3)	Represents the weighted average sales price for the shares. The range of prices for such sales was $278.54 to $279.44. The reporting person will provide upon request full information regarding the number of shares sold at each separate price.
(4)	Represents the weighted average sales price for the shares. The range of prices for such sales was $279.54 to $280.49. The reporting person will provide upon request full information regarding the number of shares sold at each separate price.
(5)	Represents the weighted average sales price for the shares. The range of prices for such sales was $280.55 to $281.27. The reporting person will provide upon request full information regarding the number of shares sold at each separate price.
(6)	Represents the weighted average sales price for the shares. The range of prices for such sales was $282.56 to $282.87. The reporting person will provide upon request full information regarding the number of shares sold at each separate price.
(7)	Represents the weighted average sales price for the shares. The range of prices for such sales was $284.37 to $285.34. The reporting person will provide upon request full information regarding the number of shares sold at each separate price.
(8)	Represents the weighted average sales price for the shares. The range of prices for such sales was $285.48 to $286.31. The reporting person will provide upon request full information regarding the number of shares sold at each separate price.
Remarks: This report is filed as form 1 of 2 to report related transactions that occurred on December 1, 2017.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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