Optical interference filter

G - Physics – 02 – B

Patent

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G02B 5/28 (2006.01)

Patent

CA 2285466

An optical interference filter having high transmissivity at first and second passbands. The interference filter comprises a first stack having a plurality of dielectric layers, a second stack having a plurality of dielectric layers, and a spacer interposed between the first and second stacks. Each of the dielectric layers included in the first and second stacks have optical thicknesses which vary quadratically. The dielectric layers have alternating high and low refractive indices.

L'invention concerne un filtre d'interférences optiques offrant une transmissivité élevée sur des première et seconde bandes passantes. Ledit filtre comprend une première pile composée de plusieurs couches diélectriques, une seconde pile également composée de plusieurs couches diélectriques, et une pièce d'espacement entre ces piles. Chaque couche diélectrique desdites piles a une épaisseur optique à variation quadratique. Les couches électriques alternent les indices de réfraction élevés et peu élevés.

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