Optical: systems and elements – Diffraction – From grating
Patent
1990-06-13
1992-11-03
Arnold, Bruce Y.
Optical: systems and elements
Diffraction
From grating
359571, 359742, 359565, G02B 518, G02B 308
Patent
active
051610574
ABSTRACT:
A transmission grating is used to reduce chromatic aberration in a Fresnel lens, wherein the lens 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 the lens surface. The facets would typically have a profile height of around 4.multidot.10.sup.-5 inch and a profile width of at least 10.sup.-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.
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Arnold Bruce Y.
Shafer R. D.
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