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A new real-time non-coherent to coherent light image converter - The hybrid field effect liquid crystal light valveA new, high-performance device has been developed for application to real-time coherent optical data processing. The new device embodies a CdS photoconductor, a CdTe light-absorbing layer, a dielectric mirror, and a liquid crystal layer sandwiched between indium-tin-oxide transparent electrodes deposited on optical quality glass flats. The noncoherent image is directed onto the photoconductor; this reduces the impedance of the photoconductor, thereby switching the ac voltage that is impressed across the electrodes onto the liquid crystal to activate the device. The liquid crystal is operated in a hybrid field effect mode. It utilizes the twisted nematic effect to create a dark off-state and the optical birefringence effect to create the bright on-state. The liquid crystal modulates the polarization of the coherent read-out light so an analyzer must be used to create an intensity modulated output beam.
Document ID
19750053047
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Grinberg, J.
Jacobson, A.
Bleha, W.
Miller, L.
Fraas, L.
Boswell, D.
Myer, G.
(Hughes Research Laboratories Malibu, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
June 1, 1975
Publication Information
Publication: Optical Engineering
Volume: 14
Subject Category
Instrumentation And Photography
Accession Number
75A37119
Funding Number(s)
CONTRACT_GRANT: NAS5-23192
Distribution Limits
Public
Copyright
Other

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