Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-11-20
1993-10-26
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 73, 359 43, G02F 113, G02F 1133, G02F 11335
Patent
active
052571238
ABSTRACT:
An optical modulating device comprises a polarizer, an analyzer and liquid crystals positioned between the polarizer and the analyzer. The device controls the birefringence of the liquid crystals by applying an electric field to the liquid crystals so as to change the polarization of light of the device. The device further comprises a rotatable halfwave plate which is positioned between the liquid crystals and the analyzer or between the liquid crystals and the polarizer in such a manner that the optical axis of the halfwave plate will be rotated around the optical axis of light coming into the optical modulating device. The device varies the rotational angle of the halfwave plate in accordance with the temperature of the liquid crystals or the environment thereof.
REFERENCES:
patent: 4413915 (1983-11-01), Besson
patent: 4711530 (1987-12-01), Nakanowatari et al.
patent: 4838663 (1989-06-01), Lagerwall et al.
Noel A. Clark, et al., "Submicrosecond Bistable Electro-Optic Switching in Liquid Crystals," Applied Physics Letter, vol. 36, No. 11, pp. 899-901 (Jun. 1980).
Mitsutake Hideaki
Shingaki Junko
Canon Kabushiki Kaisha
Parker Kenneth
Sikes William L.
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