Filter with preselected attenuation/wavelength characteristic

Details Filter with preselected attenuation/wavelength characteristic Filter with preselected attenuation/wavelength characteristic

H - Electricity

01

S

H01S 3/00 (2006.01) G02B 6/124 (2006.01) G02B 6/34 (2006.01) H01S 3/10 (2006.01) H04B 10/17 (2006.01)

Patent

CA 2137082

A filter with a preselected attenuation/ wavelength characteristic, in which spatially separated parts of the filter attenuate different wavelengths, said spatially-separated parts having different attenuation characteristics whereby to attenuate different wavelengths in a predetermined manner to provide a selected attenuation/wavelength characteristic. In one arrangement said in- terference type filter includes a grating, the pitch of which varies spatially. In one instance, the means to determine the proportion of the radiation subject to interference comprises a grating of spatially-varying effectiveness, but alternatively the means to change the proportion of radiation subject to interference may comprise an attenuation filter, the attenuation effect of the attenu- ation layer (23) varying spatially. In another arrangement, said filter may include means to separate received radiation into a spa- tially-disposed spectrum, and means (54) is provided to attenuate different parts of the spatially-disposed spectrum in such a manner as to provide said selected attenuation/wavelength characteristic.

Un filtre, qui possède des caractéristiques présélectionnées en matière d'affaiblissement/longueur d'ondes, comporte des parties séparées dans l'espace chargées d'affaiblir différentes longueurs d'ondes et dotées de caractéristiques d'affaiblissement différentes et prédéterminées. Dans une variante, ce filtre du type antiparasite comporte un treillis, dont le pas varie dans l'espace. Dans un cas, le dispositif devant déterminer la proportion du rayonnement soumis à un brouillage comprend un treillis à efficacité variable dans l'espace mais, dans d'autres cas, le dispositif devant modifier la proportion du rayonnement soumis à ce brouillage peut comporter un filtre d'affaiblissement dont l'effet de la couche d'affaiblissement (23) varie dans l'espace. Dans une autre variante, ce filtre peut comporter un dispositif permettant de scinder le rayonnement reçu en un spectre réparti dans l'espace, et on a prévu un dispositif (54) chargé d'affaiblir différentes parties de ce spectre réparti dans l'espace de façon à offrir ces caractéristiques présélectionnées d'affaiblissement/longueur d'ondes.

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