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Proceedings Paper

Design And Performance Of High-Speed Optically-Addressed Spatial Light Modulators
Author(s): W. Li; T. Kuo; G. Moddel; K. M. Johnson
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Paper Abstract

Optically-addressed spatial light modulators (OASLMs) utilizing a hydrogenated amorphous silicon photodiode as the photosensor and a ferroelectric liquid crystal as the modulator show great promise in high-speed, high-contrast spatial light modulation. We present the initial design, modelling, and performance of such devices. The devices are driven by a square-wave voltage, such that write and read operations take place under reverse bias, and an erase operation occurs under forward bias. Under continuous write-beam illumination the optical modulation is determined by the photoconductivity of the photosensor under forward bias. During chopped write-beam illumination the modulation is produced by the photocurrent produced under reverse bias. We find an increase in the contrast with reduced bias voltage, which is explained in terms of a series capacitance effect. Several polarization-based logic gates are described which utilize a single OASLM devices.

Paper Details

Date Published: 22 August 1988
PDF: 8 pages
Proc. SPIE 0936, Advances in Optical Information Processing III, (22 August 1988); doi: 10.1117/12.946919
Show Author Affiliations
W. Li, University of Colorado (United States)
T. Kuo, University of Colorado (United States)
G. Moddel, University of Colorado (United States)
K. M. Johnson, University of Colorado (United States)

Published in SPIE Proceedings Vol. 0936:
Advances in Optical Information Processing III
Dennis R. Pape, Editor(s)

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