Broadband optical limiter with sacrificial mirror to prevent irr

Details Broadband optical limiter with sacrificial mirror to prevent irr Broadband optical limiter with sacrificial mirror to prevent irr

1990-12-24

1992-10-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359297, H01J 314, G02F 100

Patent

active

051534258

ABSTRACT:
A broadband optical limiter for use in combination with a sensor system is operative to prevent irradiation of the sensor system by laser radiation of unknown wavelengths having intensity levels sufficient to damage or disable the sensor system. The broadband optical limiter is further operative to throughput, with minimal optical distortion at wide angle fields of view, electromagnetic radiation in the operating spectral band(s) of the sensor system. The broadband optical limiter includes a flat or spherically shaped sacrificial mirror that is operative to reflect electromagnetic radiation in the operating spectral band(s) of the sensor system and to be optically machined, i.e., vaporized, by focused laser radiation of unknown wavelengths having intensity levels sufficient to damage or disable the sensor system to create a reflective dead spot. The reflective dead spot prevents the focused laser radiation from being throughputted to the sensor system. The broadband optical limiter further includes optical components to focus incident electromagnetic and laser raidation onto the sacrificial mirror, to turn incident electromagnetic and laser radiation out of the field of view of the sensor system, and to turn electromagnetic radiation reflected by the sacrificial mirror back into the field of view of the sensor system.

REFERENCES:
patent: 3455627 (1969-07-01), Letter
patent: 3602576 (1971-08-01), Kohler et al.
patent: 3734592 (1973-05-01), Sztankay et al.
patent: 4719342 (1988-01-01), Cohn et al.
patent: 4917481 (1990-04-01), Koechner

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