Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-04-13
1998-08-18
Henry, Jon W.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 28, 359 7, 359577, 372 32, G01J 350, G01J 328, G03H 102, G02B 2700
Patent
active
057960968
ABSTRACT:
Substantial improvements in photorefractive device lifetimes are provided by control of electron migration which results in the decay of gratings in photorefractive materials due to diffusion and other effects. A new class of photorefractive devices using compensating electronic and ionic gratings having relatively low efficiency but nonetheless usable gratings is provided by arranging the gratings to be reflective in a wavelength band outside the photo-excitation band of the photorefractive material, as by using an infrared operating wavelength. Longer lifetimes in high efficiency gratings are achieved by constant or periodic illumination of photorefractive materials to assure uniform charged distribution of electrons and maintenance of the ionic backbone grating.
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Leyva Victor
Mao Xiaoping
Miller, Jr. Harold Everett
O'Connor Arthur Bruce
Rakuljic George Anthony
Accuwave Corporation
Henry Jon W.
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