Dispersion-compensating diffraction grating

Details Dispersion-compensating diffraction grating Dispersion-compensating diffraction grating

G - Physics

02

B

88/0.1

G02B 5/18 (2006.01) G02B 27/00 (2006.01)

Patent

CA 1321497

ABSTRACT A transmission grating is used to reduce chromatic aberration in an optical system, wherein the system's chromatic dispersion is offset and substantially canceled by the grating's diffraction-induced dispersion. The grating comprises a Fresnel-type pattern of microscopic facets molded directly into one of the system's refractive optical surfaces. The facets would typically have a profile height of around 4.10-5 inch and a profile width of at least 10-3 inch. In its primary intended application, the invention would function to improve the optical performance of a Fresnel lens used to concentrate direct sunlight into a piped daylight illumination system. For this application, about a ten-fold reduction in chromatic dispersion would be attained with only about a 2% loss in optical efficiency. 57

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