Photoactivated electric field effects in nematic liquid crystals serve as reversible nearly real‐time techniques for recording phase‐type holograms. In a sandwich‐type cell, a photoconductive coating separates one conductive electrode from the liquid‐crystal layer, which is operated below the threshold voltage for dynamic scattering. In CdS cells, transient first‐order diffraction efficiencies of 10–30% are obtained within 0.1–0.2 sec from visible light exposures of less than 1 μJ/cm2. A 10‐μW/cm2 Ar‐ion laser interference pattern of 40 cycle/mm produced a steady‐state first‐order diffraction efficiency of 8% in a 13‐μm thickness of MBBA in a cell operated at 4‐V dc. Resolutions up to 100 cycle/mm are observed for this thickness of liquid crystal.
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1 October 1971
Research Article|
October 01 1971
Transparent Phase Images in Photoactivated Liquid Crystals
J. D. Margerum;
J. D. Margerum
Hughes Research Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265
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T. D. Beard;
T. D. Beard
Hughes Research Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265
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W. P. Bleha, Jr.;
W. P. Bleha, Jr.
Hughes Research Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265
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S. ‐Y. Wong
S. ‐Y. Wong
Hughes Research Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265
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Appl. Phys. Lett. 19, 216–218 (1971)
Article history
Received:
June 24 1971
Citation
J. D. Margerum, T. D. Beard, W. P. Bleha, S. ‐Y. Wong; Transparent Phase Images in Photoactivated Liquid Crystals. Appl. Phys. Lett. 1 October 1971; 19 (7): 216–218. https://doi.org/10.1063/1.1653891
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