Ring interferometer configuration for writing gratings

G - Physics – 02 – B

Patent

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G02B 5/18 (2006.01) G02B 6/136 (2006.01) H01S 3/081 (2006.01)

Patent

CA 2238983

A method and apparatus is disclosed for creating a structure, such as a grating (45) in a photosensitive material (40). The method and apparatus relies upon creating at least two coherent beams of light (33, 38) and reflecting them, in a counter propagating manner, around a series of reflective elements (35, 37) along substantially equivalent paths so that the coherent beams interfere at a structure staging area (45). The structure staging area can then be utilised to create grating structures or the like having improved qualities.

Cette invention concerne un procédé et un appareil de création d'une structure, du type réseau de diffraction (45) sur un matériau photosensible (40). Ledit procédé, en association avec ledit appareil, consiste à créer au moins deux faisceaux de lumière cohérente (33, 38) et à provoquer leur réflexion, dans des sens de propagation contraires, autour d'une série d'éléments réflecteurs (35, 37) le long de trajectoires sensiblement équivalentes de façon à ce que les faisceaux cohérents interfèrent au niveau d'une zone d'organisation de ladite structure (45). Cette zone d'organisation de la structure peut ensuite servir à produire les structures de réseau de diffraction ou analogues à caractéristiques améliorées.

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