G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/00 (2006.01) G01J 3/18 (2006.01) G02B 5/18 (2006.01)
Patent
CA 2280531
An optical system for focusing an incident light so as to obtain a linear output (as a function of the wavelength, or of the order of diffraction, or of the grating spacial frequency or of the inverse of the index of refraction) comprises a diffraction grating and a lens, or a group of lenses, having a f-Sin(.theta.) characteristic, where f is the effective focal length of the lens, or group of lenses, and .theta. is an output angle of the light exiting from the diffraction grating. Therefore, a light incident on the diffraction grating reaches the lens, or the group of lenses, and results in a linear output. Using the present invention in a spectrometer reduces the time consuming calibration process required and renders it easier because of the linear output between wavelength and pixels positions. The lens, or.group of lenses, has a diffractive, refractive or reflective property, or any combination thereof. The incident light can be a collimated, converging or diverging beam. The diffraction grating can be a plane, concave or convex grating.
Institut National D'optique
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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