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Method and apparatus for writing grating structures using controlled phase delay between beams

  • US 20060147811A1
  • Filed: 02/27/2006
  • Published: 07/06/2006
  • Est. Priority Date: 05/29/1998
  • Status: Abandoned Application
First Claim
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1. A method of writing a grating structure with at least one of predetermined amplitude, period and phase properties in a photosensitive waveguide, the method comprising:

  • providing at least two light beams which overlap in an overlap region to form an interference pattern;

    moving the photosensitive waveguide through the overlap region; and

    modulating the phase of at least one of the light beams relative to the phase of the other light beams using a non-mechanical beam modulator so that the interference pattern appears to move through the overlap region, the apparent movement being variably controlled in response to the movement of the photosensitive waveguide such that a grating structure is written with the at least one of predetermined amplitude, period and phase properties.

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