Method and apparatus for recording an optical grating in a...

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G - Physics

02

B

G02B 5/18 (2006.01) G02B 6/02 (2006.01) G02B 6/10 (2006.01) G02B 6/124 (2006.01) G02B 6/12 (2006.01) G02B 6/34 (2006.01)

Patent

CA 2377208

A method and an apparatus for recording optical gratings in a photosensitive medium are provided. The invention uses a phase mask in combination with a scanning of the recording light beam. The phase mask, or alternatively the photosensitive medium, is translated along a direction parallel to the scanning of the light beam, so that the period of the recorded grating may be focally adjusted. To ensure a proper recording efficiency over a large range, an appropriately selected wavefront curvature is provided in the light beam. The method of the invention is particularly advantageous for the recording of superimposed grating components in a photosensitive medium.

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