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<PAGE> EXHIBIT 23.1 INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in this Registration Statement of Coherent, Inc. on Form S-8 of our report dated November 1, 1999, appearing in the Annual Report on Form 10-K of Coherent, Inc. for the year ended October 2, 1999. /s/ DELOITTE & TOUCHE LLP Deloitte and Touche LLP San Jose, California September 13, 2000
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