Phase mask for machining optical fibers, and its fabrication...

G - Physics – 02 – B

Patent

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Details

G02B 6/136 (2006.01) G02B 5/26 (2006.01) G03F 1/00 (2006.01) G03F 7/00 (2006.01)

Patent

CA 2264843

The invention relates to an optical fiber-processing phase mask which enables a phase mask with a groove pitch varying in a position-dependent manner to be easily obtained by electron beam writing, and its fabrication method. In the optical fiber-processing phase mask comprising on one surface of a transparent substrate a repetitive pattern of grooves (26) and strips (27) located in a grating form, so that an optical fiber is irradiated with diffracted light according to the repetitive pattern to make a diffraction grating in said optical fiber by an interference fringe of diffracted light of different orders, a plurality of patterns (A1 to A3) having a linearly or nonlinearly increasing or decreasing pitch are juxtaposed, with a constant width ratio between the grooves (26) and the strips (27). The phase mask is fabricated by carrying out writing while the groove-and-strip patterns with a different pitch are juxtaposed.

L'invention porte sur un masque de phase utilisé dans le façonnage de fibres optiques, et sur la facilité de traçage par faisceau d'électrons du masque de phase dont le pas des sillons creux varie en fonction des positions. D'un côté d'un substrat transparent sont formés une pluralité de motifs (A1-A3) répétitifs de type grilles constitués de sillons (26) et de nervures (27), la lumière réfractée par les motifs étant projetée sur une fibre optique de façon à y former une grille par les lignes d'interférence produites par les lumières réfractées de différents ordres. Le pas des sillons augmente ou diminue linéairement ou non linéairement, le rapport de la largeur entre les sillons (26) et les nervures (27) restant constant. Pour fabriquer ce masque de phase, on dispose une pluralité de motifs de sillons (26) et de nervures (27) de pas différents et on effectue le traçage par faisceau d'électrons.

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