Counter-Counter Optical Device (U)

Details Counter-Counter Optical Device (U) Counter-Counter Optical Device (U)

1984-04-13

1999-06-29

Buczinski, Stephen C.

Optical: systems and elements

Glare or unwanted light reduction

With absorption means

356351, 356352, 359589, 25033901, 250216, 250225, G02B 2700, G02B 528, G01B 902, G01J 502

Patent

active

059176547

ABSTRACT:
Two Fabry-Perot interference filters are used as tandum polarizers for a h-power laser beam counter measure in an optical scene. The scene radiation is directed on one polarizer; one plane of polarization of the laser beam is transmitted thereby and the other scene radiation is reflected to the other polarizer. The other polarizer transmits the other plane of polarization of the laser beam and reflects the other scene radiation to a photodetector, such as an image intensifier, infrared imager, television camera tube, or a human eye. The laser beam transmitted by the polarizers is trapped by absorbers and cannot harm the photodetector.

REFERENCES:
patent: 3792916 (1974-02-01), Sarna
patent: 4487478 (1984-12-01), Jackson
Jenkins et al., Fundamentals Of Optics, 4th Ed., 1976, Mcgraw-Hill, p.498.

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