Catadioptric infrared lenses

Details Catadioptric infrared lenses Catadioptric infrared lenses

1986-07-10

1987-12-22

Corbin, John K.

350 14, 350443, 350444, G02B 1708, G02B 1314

Patent

active

047143070

ABSTRACT:
An apochromatic catadioptric lens is provided which can operate in the 3 to 5 and the 8 to 12 micron wavebands. The lens comprises a primary mirror having an opening and a Mangin secondary mirror for directing light of the required wavebands through the opening. In the light paths between the primary mirror and Mangin secondary mirror are a pair of refracting lens elements of optically transmissive materials different from each other and from that of the Mangin secondary mirror. Preferably, the Mangin secondary mirror is of germanium, the refracting lens element of the pair nearer the Mangin secondary mirror is of zinc sulphide and the refracting lens element of the pair further from the Mangin secondary mirror is of zinc selenide. The invention also extends to an afocal telescope of non-Galilean form incorporating such a lens.

REFERENCES:
patent: 3507556 (1970-04-01), Shimizu
patent: 3632190 (1972-01-01), Shimizu
patent: 4061420 (1977-12-01), Kaprelian et al.
patent: 4188091 (1980-02-01), Fujii
patent: 4403836 (1983-09-01), Mihara
patent: 4600265 (1986-07-01), Norrie

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