Multiple quantum well electrically/optically addressed spatial l

Optical: systems and elements – Optical modulator – Light wave temporal modulation

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

382211, G02F 103, G06K 976

Patent

active

058447091

ABSTRACT:
A multiple quantum well spatial light modulator combines both optically addressed and electrically addressed portions on a single wafer. The electrically and optically addressed portions may be physically distinct or combined. To fabricate the modulator, a portion of an optically addressed multiple quantum well spatial light modulator is configured as an electrically addressed portion by pixellating that portion of the multiple quantum well wafer. The frequency of the applied voltage to the electrically addressed portion is increased such that the voltage switches faster than both the dark and illuminated screening time. The electrically and optically addressed portions may be combined or positioned side-by-side. The spatial light modulator has applications in a wide variety of low-cost, high performance pattern recognition systems. In one system, a first infrared beam impinges the electrically addressed portion of the modulator and picks up the pattern electrically written thereon (i.e., the template image). A second infrared beam impinges the optically addressed portion of the modulator and picks up the pattern written thereon by a white light writing beam (i.e., sample image). The first and second infrared beams then pass through a lens, where the beams are Fourier transformed in the plane of an optically addressed spatial light modulator (OASLM). The correlation hologram formed on the OASLM is read out by a third infrared beam and detected using a photodiode array. In a second system, the lens and OASLM are replaced with a parabolic reflector which reflects the first and second infrared beams onto the optically addressed portion of the modulator.

REFERENCES:
patent: 5040140 (1991-08-01), Horner
patent: 5086483 (1992-02-01), Capps
patent: 5119443 (1992-06-01), Javidi et al.
patent: 5151822 (1992-09-01), Hekker et al.
patent: 5412499 (1995-05-01), Chiu et al.
patent: 5528702 (1996-06-01), Mitsuoka et al.
patent: 5600485 (1997-02-01), Iwaki et al.
patent: 5637883 (1997-06-01), Bowman et al.
C.L. Adler et al., Dynamic White Light Holography Using and Optically Addsed Multiple Quantum Well Spatial Light Modulator, Optical Communications, vol. 114, p. 375 (Feb. 15, 1995).
S.R. Bowman et al., High-Resolution Spatial Light Modulators Using GaAs/AlGaAs Quantum Wells, Applied Physics Letters, vol. 65, p. 956 (No. 8, Aug. 22, 1994).
W.S. Rabinovich et al., Intrinsic Multiple Quantum Well Spatial Light Modulators, Applied Physics Letters, vol. 66, p. 1044 (No. 9, Feb. 27, 1995.
A. Partovi et al., Cr-Doped GaAs/AlGaAs Semi-Insulating Multiple Quantum Well Photorefractive Devices, Applied Physics Letters, vol. 62, p. 464 (No. 5, Feb. 1, 1983).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Multiple quantum well electrically/optically addressed spatial l does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multiple quantum well electrically/optically addressed spatial l, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple quantum well electrically/optically addressed spatial l will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2400054

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.