Notch filter system

G - Physics – 02 – B

Patent

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Details

G02B 5/20 (2006.01) G02B 5/18 (2006.01) G02B 5/26 (2006.01)

Patent

CA 2679449

A notch filter system, where multiple filter passes of a light signal may be effected for removing a target spectral component from the light signal, is provided. Advantageously, the notch filter system may be tunable. A cascade notch filter system is provided which includes multiple notch filters arranged in a cascade, each of the filters having spectral filtering characteristics and being disposed in the path of the light signal at an appropriate filter angle so that the target spectral component is filtered out of the light signal as the light signal passes therethrough. A multipass notch filter system is provided which includes a notch filter having spectral filtering characteristics, and an optical assembly for directing the light signal for multiple filter passes through the filter at an appropriate angle, so that the target spectral component is filtered out of the light signal as the light signal passes through the filter.

L'invention concerne un système de filtre coupe-bande dans lequel de multiples passages de filtre d'un signal lumineux peuvent être effectués pour éliminer une composante spectrale cible du signal lumineux. De façon avantageuse, le système de filtre coupe-bande peut être accordable. L'invention propose un système de filtre coupe-bande en cascade dans lequel de multiples filtres coupe-bande sont disposés en une cascade. Chaque filtres présente des caractéristiques de filtrage spectral et est disposé sur le trajet du signal lumineux à un angle de filtre approprié pour que la composante spectrale cible soit éliminée par filtrage du signal lumineux à mesure que le signal lumineux traverse le filtre. L'invention concerne un système de filtre coupe-bande à multiples passages qui comprend un filtre coupe-bande présentant des caractéristiques de filtrage spectral ainsi qu'un ensemble optique permettant de diriger le signal lumineux pour qu'il traverse de multiples fois le filtre à un angle approprié, de telle sorte que la composante spectrale cible est éliminée par filtrage du signal lumineux à mesure que le signal lumineux traverse le filtre.

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