Dyson-type imaging spectrometer having improved image...

G - Physics – 01 – J

Patent

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Details

G01J 3/18 (2006.01) G01J 3/28 (2006.01)

Patent

CA 2742493

The invention relates to a Dyson-type imaging spectrometer that includes an input port (1) extending in a direction X, an output port, a diffraction array (4) including a set of streaks on a concave substrate, an optical system including a lens (2), said lens having a first planar surface (8) and a second convex surface (3), the convex surface of the lens and the concave surface of the diffraction array being concentric, wherein said optical system is capable of receiving a light beam from an input port and of directing the same towards the diffraction array, and of receiving a beam diffracted by the diffraction array and of forming a spectral image of said diffracted beam in a plane (7) of the output port, wherein said spectral image can be spatially resolved in an extension direction X of the image of the input port. According to the invention, the diffraction array (4) includes a set of nonparallel and non-equidistant streaks and/or the substrate of the diffraction array is nonspherical so as to form an image of the input port in the output plane having an improved image quality and very small distortions.

L'invention concerne un spectromètre imageur de type Dyson comprenant un port d'entrée (1) s'étendant selon une direction X, un port de sortie, un réseau de diffraction (4) comprenant un ensemble de traits sur un support concave, un système optique comprenant une lentille (2), ladite lentille comprenant une première face plane (8) et une seconde face convexe (3), la face convexe de la lentille et la face concave du réseau de diffraction étant concentriques, ledit système optique étant apte à recevoir un faisceau lumineux provenant du port d'entrée et à le diriger vers le réseau de diffraction et à recevoir un faisceau diffracté par le réseau de diffraction et à former une image spectrale dudit faisceau diffracté dans un plan (7) du port de sortie, ladite image spectrale étant apte à être résolue spatialement dans une direction d'extension X' de l'image du port d'entrée. Selon l'invention, le réseau de diffraction (4) comprend un ensemble de traits non parallèles et non équidistants et/ou le support du réseau de diffraction est asphérique de manière à former une image du port d'entrée dans le plan de sortie dont la qualité image est améliorée et à très faibles distorsions.

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