G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 6/12 (2006.01) G02B 5/18 (2006.01) G02B 6/34 (2006.01)
Patent
CA 2331487
Process for writing Bragg gratings, apparatus for using this process and Bragg grating devices obtained by this process. According to the invention, a Bragg grating is written in a light guide (36) by transferring the interference pattern between two light beams (28, 30) with the same wavelength and coherent with each other but with an angular offset, directly into the substrate due to a photosensitivity phenomenon within the same said substrate, this interference pattern being transferred in the substrate in the form of a modulation of the refraction index of this substrate. At least one of the said light beams is divided into at least two sub-beams offset in phase with respect to each other.
Selon l'invention, pour inscrire un réseau de Bragg dans un guide de lumière (36) on transfère directement dans le substrat, par un phénomène de photosensibilité utilisé au sein même dudit substrat, la figure des interférences entre deux faisceaux lumineux (28, 30) angulairement décalés, de même longueur d'onde et cohérents, cette figure d'interférences étant transférée, dans le substrat, sous la forme d'une modulation d'indice de réfraction de ce substrat. Au moins l'un des faisceaux est divisé avec une lame de phase (42) en au moins deux sous-faisceaux présentant un décalage de phase l'un par rapport à l'autre.
Ferdinand Pierre
Magne Sylvain
Martinez Christophe
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