Optical devices having a wavelength-tunable dispersion...

G - Physics – 01 – J

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G01J 3/18 (2006.01) G01J 3/44 (2006.01) G02B 5/18 (2006.01) G02B 27/10 (2006.01)

Patent

CA 2422747

A spectrometer (20) has a source of illumination radiation (21) having a plurality of spectral wavelengths, a bandpass filter (14), a dispersive beamsplitter (28), an illumination radiation rejection filter (34), and a spectrograph (32) each tunable in correspondences to a selected one of the plurality of spectral wavelengths of the source of illumination radiation. Any one of the tunable elements can comprise a holographic volume dispersion distraction grating and a mirror, both having fixed orientation displacement with respect to each other and being rotable for tuning around an avis corresponding to the interaction of the two planes coincident with the surfaces of said mirror and said grating.

L'invention concerne un spectromètre (20) comprenant une source de rayonnement (21) lumineux qui présente une pluralité de longueurs d'ondes spectrales, un filtre (14) passe-bande, un diviseur (28) de faisceau dispersif, un filtre (34) éliminant le rayonnement lumineux et un spectrographe (32), qui peuvent tous être réglés sur une longueur d'onde spectrale sélectionnée de la source de rayonnement lumineux. Un ou plusieurs de ces éléments réglables peuvent comprendre un réseau de diffraction holographique à dispersion en volume et un miroir, qui présentent une décalage et une orientation fixe l'un par rapport à l'autre et peuvent être réglés par pivotement autour d'un axe correspondant à l'intersection des deux plans qui coïncident avec les surfaces du miroir et du réseau.

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