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Method of forming a refractive index grating in an optical waveguide

  • US 5,377,288 A
  • Filed: 11/03/1992
  • Issued: 12/27/1994
  • Est. Priority Date: 04/06/1990
  • Status: Expired due to Term
First Claim
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1. A method of forming a refractive index grating in an optical waveguide comprising positioning the optical waveguide against a first face of a block of refractive material and directing a coherent beam of optical radiation at a first wavelength at the block so that a standing wave field is formed within the optical waveguide by a first portion of the beam propagating through the block directly to the first face and a second portion reflected at a second face of the block, said standing wave field is maintained until a refractive index grating reflective at a second wavelength longer than the first is formed.

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