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SPATIAL LIGHT MODULATORS

Ambiguities in measuring the physical parameters for twisted-nematic liquid crystal spatial light modulators

[+] Author Affiliations
Jeffrey A. Davis, David B. Allison, Kevin G. D’Nelly, Michael L. Wilson

San Diego State University, Department of Physics, San Diego, California?92182

Ignacio Moreno

Universitad de Valencia, Departamento de Optica, 46100 Burjassot, Spain

Opt. Eng. 38(4), 705-709 (Apr 01, 1999). doi:10.1117/1.602113
History: Received Feb. 20, 1998; Revised July 6, 1998; Accepted Oct. 30, 1998
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Abstract

There is great interest in using commercially available twisted-nematic liquid crystal displays as programmable spatial light modulators. Proper use of such displays, particularly as phase-only filters for optical correlators or as diffractive optical elements, requires knowledge of the physical parameters of the device including the twist angle, the birefringence, and the orientation of the director axes. A simple experimental technique was published for evaluation of these parameters. When we used this technique, however, we found a number of different sets of values that satisfied the experimental data. We demonstrate that additional measurements at different wavelengths can resolve these ambiguities and provide valuable information about the wavelength dependence of the birefringence. © 1999 Society of Photo-Optical Instrumentation Engineers.

© 1999 Society of Photo-Optical Instrumentation Engineers

Citation

Jeffrey A. Davis ; David B. Allison ; Kevin G. D’Nelly ; Michael L. Wilson and Ignacio Moreno
"Ambiguities in measuring the physical parameters for twisted-nematic liquid crystal spatial light modulators", Opt. Eng. 38(4), 705-709 (Apr 01, 1999). ; http://dx.doi.org/10.1117/1.602113


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