Interferometric/feedback spatial light modulation system and met

Details Interferometric/feedback spatial light modulation system and met Interferometric/feedback spatial light modulation system and met

1987-12-21

1989-08-08

LaRoche, Eugene R.

350354, 350353, G02F 101

Patent

active

048546771

ABSTRACT:
A spatial light modulator and associated method are disclosed which achieve an intensity-to-intensity spatial transformation between a noncoherent input beam and a coherent output beam. An intermediate intensity-to-phase modulator provides a coherent, spatially phased modulated readout beam that is combined with a coherent reference beam in an interferometer to yield the desired coherent, spatially intensity modulated output beam. The interferometer also produces a feedback beam with a spatial intensity modulation complementary to that of the input and output beams. The feedback beam is combined with the input beam in a feedback loop that significantly improves the system's response time, and can also enhance the linearity of its transfer characteristic.

REFERENCES:
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patent: 4750834 (1988-06-01), Fateley
Bilenko et al., "Use of Low-Inertia Semiconductor Structures to Modulate Radiation in a Submillimeter Laser Interferometer", Inserum of Exp. Tech., vol. 21, No. 6, pp. 1575-1577, Jun. 1979.
Bleha, "Progress in Liquid Crystal Light Values", Laser Focus/Electro-Optics, Oct. 1983, pp. 111-120.
Glenn D. Craig, "Wide-Brightness-Range Video Camera", NASA Tech. Briefs, Fall 1985, p. 52.
D. Psaltis, J. Yu, A. Marrakchi and A. R. Tanguay, Jr., "Photorefractive Incoherent-to Coherent Optical Conversion", SPIE, vol. 465, Spatial Light Modulators and Applications (1984), pp. 2-8.
David Casasent, "Spatial Light Modulators", Proceedings of the IEEE, vol. 65, No. 1, Jan. 1977, pp. 143-157.

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