Diffraction grating element

Details Diffraction grating element Diffraction grating element

G - Physics

02

B

G02B 5/18 (2006.01) G02B 6/34 (2006.01)

Patent

CA 2473911

The present invention provides a diffraction grating element that allows the temperature control mechanism to be dispensed with or simplified. The diffraction grating element of the present invention comprises a transparent plate having a first surface and a second surface that are substantially parallel with one another; and a diffraction grating which is formed on a first surface side with respect to the second surface and is substantially parallel with the first surface. At any temperature within a temperature range -20°C to +80°C, the sum of the rate of change in the period per unit length of the diffraction grating with respect to a temperature change, and the temperature coefficient of the refractive index of a medium that surrounds the diffraction grating element is 0.

L'invention concerne un élément de réseau de diffraction permettant de simplifier ou d'éliminer un mécanisme de commande de température. L'élément de réseau de diffraction de l'invention comprend une plaque transparente présentant une première surface et une seconde surface sensiblement parallèles l'une par rapport à l'autre; et un réseau de diffraction formé sur un premier côté de surface par rapport à la seconde surface, et sensiblement parallèle à la première surface. A une température quelconque, comprise dans la plage de température allant de 20 DEG C à +80 DEG C, la somme du taux de changement dans la longueur période par unité du réseau de diffraction par rapport à la température de changement, et du coefficient de température de l'indice de réfraction d'un support entourant l'élément du réseau de diffraction est égale à zéro.

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