Optical information processor employing a phase type spatial lig

Details Optical information processor employing a phase type spatial lig Optical information processor employing a phase type spatial lig

1995-02-03

1996-11-26

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 72, 359 93, G02F 11335

Patent

active

055791360

ABSTRACT:
In an optical information processor, phase-type spatial modulation of light is achieved by placing a twisted nematic liquid crystal cell between two polarizers, such that a direction of alignment of liquid crystal molecules at an input side of the liquid crystal cell is parallel to a transmission access of a first one of the polarizers, and such that a direction of alignment liquid crystal molecules at an output side of the liquid crystal cell is parallel to a transmission access of a second one of the polarizers. Also, phase modulation which is substantially free from amplitude variations can be realized by placing two twisted nematic liquid crystal cells between two polarizers. In such an arrangement, a direction of alignment of the liquid crystal molecules at an input side of a first liquid crystal cell is parallel to a transmission access of a first polarizer, and a direction of alignment of liquid crystal molecules at an output side of the first liquid crystal cell is perpendicular to a direction of alignment of the liquid crystal molecules at an input side of the second liquid crystal cell. The direction of alignment of the liquid crystal molecules of the second liquid crystal cell is perpendicular to a transmission access of the second polarizer. The two liquid crystal cells have identical drive voltages applied thereto, and have identical retardations and twist angles. However, the twist angle of the first liquid crystal cell is in an opposite direction to that of the second liquid crystal cell.

REFERENCES:
patent: 5044732 (1991-09-01), Kimura et al.
Barnes et al., "Phase . . . Correlation Systems", SPIE, Optical Pattern Recognition II, vol. 1134, 1989, pp. 204-208.
Barnes et al., "Phase-Only . . . Television", Applied Optics, vol. 28, No. 22, Nov. 15, 1989, pp. 4845-4852.
Konforti et al., "Phase-Only . . . Modulators", Optics Lett., vol. 13, No. 3, Mar. 1988, pp. 251-253.
Patent Abstracts of Japan, vol. 3, No. 127 (E-146) Oct. 23, 1979, JP 54-104857.
Lu et al., "Theory and design of the liquid crystal TV as an optical spatial phase modulator", Optical Engineering, vol. 29, No. 3, Mar. 1990, pp. 240-246.
Barnes et al., "Optoelectronic determination of binary phase-only filters for optical correlation", Optical Engineering, vol. 31, No. 9, Sep. 1991, p. 1936.
Yocky et al., "Simple measurement of the phase modulation capability of liquid crystal phase-only light modulators", Optik, vol. 84, No. 4, Apr. 1990, pp. 140-144.

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