Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-12-09
1996-02-27
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
359 7, 359 15, 359308, 250226, H01J 314, H01J 516, H01J 4014
Patent
active
054951011
ABSTRACT:
A passive broadband sensor protection and enhancement system and technique. ncident light is focused with a cylindrical lens on the optical axis into an intense light strip onto the input face of a photorefractive crystal which may include optional anti-reflection coatings on the input and output face. A broadband high reflection coating proximate to the input face reflects all radiation from approximately 0.68 out to at least 1.5 micrometers wavelength and light exiting includes a transmitted beam and beam fan. A weak holographic grating is used to seed the beam fan, such that is fanned out of the optical path in a direction determined by the c-axis, dominant electro-optic coefficient, and charge carriers participating in the photorefractive process. The transmitted beam contains only incoherent radiation as input to a sensitive detector resulting in broadband multiline protection from the visible spectrum for substantially all pulsewidths and cw lasers, with enhanced time response and interaction length.
REFERENCES:
patent: 5073075 (1991-12-01), Sharp et al.
patent: 5369511 (1994-11-01), Amos
patent: 5449904 (1995-09-01), Miller et al.
Salamo Gregory J.
Sharp Edward J.
Shultz John J.
Wood Gary L.
Bashore Alain L.
Lane Anthony T.
Lee Milton W.
Steady Jacqueline M.
The United States of America as represented by the Secretary of
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