Optical element employing aspherical and binary grating optical

Details Optical element employing aspherical and binary grating optical Optical element employing aspherical and binary grating optical

1990-02-06

1991-09-03

Arnold, Bruce Y.

Optical: systems and elements

Having significant infrared or ultraviolet property

Lens, lens system or component

359356, 359565, 359571, 359728, 359771, G02B 302, G02B 308, G02B 518, G02B 934

Patent

active

050447068

ABSTRACT:
An optical element (12) has aspherical (14) and binary grating (16) optical surfaces. In the preferred embodiment, the optical element (12) is a positive meniscus optical element made of germanium having a useful spectral bandpass in the infrared wavelength region. A telescope (100) includes a first positive meniscus optical element (102), having a convex aspherical surface (104) and a concave binary grating surface (106). A first negative meniscus optical element (107) having a concave binary grating surface (108) and a concave aspherical surface (110) is employed. Next is a positive power lens (112), followed by a second negative meniscus lens (118). In the preferred embodiment, the first negative meniscus optical element (107) and the positive power lens (112) are affixed to a common housing (124), which is removable from the telescope system. Removal of the housing (124) converts the telescope (100) system from a wide-field-of-view telescope (100) to a narrow-field-of-view telescope (40).

REFERENCES:
patent: 3572903 (1971-03-01), Hofmann
patent: 3904281 (1975-09-01), Jampolsky
patent: 4293196 (1981-10-01), Hilbert
patent: 4787722 (1988-11-01), Claytor
patent: 4881805 (1989-11-01), Cohen
patent: 4950057 (1990-08-01), Shirayanagi
Swanson et al, "Infrared Application of Diffractive Optical Elements,"SPIE Proceedings, vol. 885, 1988, Paper No. 22.

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