Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-03-21
1992-09-15
Miller, Stanley D.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 74, 359 87, G02F 1135, G02F 11333, G02F 11334
Patent
active
051482983
ABSTRACT:
A spatial light modulator providing an improved contrast, has a laminated structure of multiple layers including typically a photoconductive layer, an optical modulation layer, and a pair of electrode layers interposing the photoconductive and optical modulation layers. The thickness of at least one of the electrode layers having a predetermined relationship with a wavelength of light incident to the one of the electrode layers for writing or reading-out information into or from the spatial light modulator. The electrode layer may further comprise an electrode member and an intermediate layer disposed between the electrode member and an adjacent layer laminated adjacent to the one of the electrode layers, the electrode member having a first refractive index, the adjacent layer having a second refractive index, and the intermediate layer having a third refractive index determined to be in between the first and second indices, the thickness of the intermediate layer having an another predetermined relationship with the wavelength of the light incident to the one of the electrode layers for writing or reading-out information into or from the spatial light modulator. The intermediate layer may be a single layer-member or multiple layer-members having different refractive indices each other.
REFERENCES:
patent: 4124278 (1978-11-01), Grinberg et al.
patent: 4127322 (1978-11-01), Jacobson et al.
patent: 4272157 (1981-06-01), Collins, Jr. et al.
patent: 4432611 (1984-02-01), Wei
patent: 5076670 (1991-12-01), Sayyah
"Reflection mode spatial light modulator using polymer-dispersed liquid crystal and BSO crystal" by Takizawa et al., Applied Physics Society, Autumn 1989.
T. D. Beard, W. P. Bleha, and S. Wong, "ac liquid-crystal light valve" Applied Physics Letter, vol. 22, No. 3, Feb. 1, 1973.
Preprint for the 50th Meeting of the Japan Society of Applied Physics, p. 762, 3 papers 28p-ZD-5 through 7 are introduced.
Konno Toshio
Ohkouchi Nozomu
Shigeta Masanobu
Shimizu Shigeo
Takenaka Hiromitsu
Gross Anita Pellman
Meller Michael N.
Miller Stanley D.
Victor Company of Japan
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