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Optical Engineering

A New Real-Time Non-Coherent to Coherent Light Image Converter The Hybrid Field Effect Liquid Crystal Light Valve
Author(s): Jan Grinberg; Alex Jacobson; William Bleha; Leroy Miller; Lewis Fraas; Donald Boswell; Gary Myer
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Paper Abstract

A 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 indiumtin-oxide transparent electrodes deposited on optical quality glass flats. The non-coherent image is directed onto the photoconductor; this reduces the impedance of the photoconductor, thereby switching the ac vol-tage 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 (voltage off the liquid crystal) 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. Performance figures for the device include: Resolution 100 lines/mm; Input Sensitivity 160 iW/cm2 at 525 nm; Time Response on: 10. msec; off: 15 msec; Contrast >100 : 1 ; Aperture 1 inch by 1 inch.

Paper Details

Date Published: 1 June 1975
PDF: 1 pages
Opt. Eng. 14(3) 143217 doi: 10.1117/12.7971871
Published in: Optical Engineering Volume 14, Issue 3
Show Author Affiliations
Jan Grinberg, The Hughes Research Laboratories (United States)
Alex Jacobson, The Hughes Research Laboratories (United States)
William Bleha, The Hughes Research Laboratories (United States)
Leroy Miller, The Hughes Research Laboratories (United States)
Lewis Fraas, The Hughes Research Laboratories (United States)
Donald Boswell, The Hughes Research Laboratories (United States)
Gary Myer, The Hughes Research Laboratories (United States)

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