Spatial light modulator device and a conoscopic holography system of large dynamic range including such a modulator device
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United States of America Patent
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Mar 1, 1994
Grant Date -
N/A
app pub date -
Jul 29, 1991
filing date -
Jul 27, 1990
priority date (Note) -
Expired
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Abstract
The invention relates to a spatial light modulator device comprising a photo-refractive crystal addressed by means of a write light beam and a read light beam. The crystal is placed in the cavity of an interferometer system having a transmittivity-optical path length characteristic of steep slope so as to give rise to a dynamic range of maximum transmittivity variation for minimum variation in the refractive index or optical path length of the photo-refractive crystal. The device is applicable to conoscopic holography systems of large dynamic range and to pattern recognition in real time.
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