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Proceedings Paper

Efficiency of liquid-crystal light valves as polarization rotators
Author(s): Neil Collings; Wei Xue; Giancarlo Pedrini
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Paper Abstract

Liquid crystal light valves (LCLVs) have found application in many proposed and demonstrated optical computing systems. In many cases the polarization state of the illumination is used to encode information, e.g., symbolic substitution and neural networks. In these applications it is often desired that two linear and orthogonal states of polarization result from the devices used. This is the form of polarization coding used in this paper. Any deviations from these desired polarization states will results in signal crosstalk within the system. Typically, the light reflected from the light valve is elliptically polarized. By adjusting the drive conditions or setting the light valve at a fixed azimuth, the degree of ellipticity can be minimized. However, the rotation of the major axis is usually less than 90 degree(s). The authors characterize three different types of LCLVs based on twisted nematic, aligned nematic, and ferroelectric (smectic C) liquid crystals. The optical activity and birefringence of the devices as a function of write light intensity are being studied. System crosstalk resulting from any deviations from the desired characteristics is discussed.

Paper Details

Date Published: 1 September 1991
PDF: 8 pages
Proc. SPIE 1505, Optics for Computers: Architectures and Technologies, (1 September 1991); doi: 10.1117/12.47004
Show Author Affiliations
Neil Collings, Univ. of Neuchatel (Switzerland)
Wei Xue, Univ. of Neuchatel (Switzerland)
Giancarlo Pedrini, Univ. of Neuchatel (Switzerland)

Published in SPIE Proceedings Vol. 1505:
Optics for Computers: Architectures and Technologies
Guy J. Lebreton, Editor(s)

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