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Proceedings Paper

Full-complex modulation spatial light modulator using two coupled-mode modulation liquid crystal televisions
Author(s): Danny Roberge; Luiz Goncalves Neto; Yunlong Sheng
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Paper Abstract

We obtain electrically switchable optical complex amplitude modulations with two commercial twisted nematic liquid crystal televisions (LCTV's) which are in the phase/amplitude coupled modulation modes. The condition for the full complex modulation is that one of the coupled mode LCTV's provides the fill range of 2(pi) phase modulation. A look-up table encoding method is proposed that permits to compensate and correct the coupling and nonlinearity in the modulations of the individual LCTV's. A simple wedged share plate interferometer is proposed to measure the phase modulation. Based on the theory of the twisted nematic LCTV, experimental adjustments for the phase-mostly and amplitude modulation LCTV's is presented. Optical Fresnel and Fourier complex amplitude holograms and optical complex amplitude correlation filters are shown.

Paper Details

Date Published: 28 March 1995
PDF: 9 pages
Proc. SPIE 2490, Optical Pattern Recognition VI, (28 March 1995); doi: 10.1117/12.205800
Show Author Affiliations
Danny Roberge, COPL/Univ. Laval (Canada)
Luiz Goncalves Neto, COPL/Univ. Laval (Canada) and CNPq (Brazil)
Yunlong Sheng, COPL/Univ. Laval (Canada)

Published in SPIE Proceedings Vol. 2490:
Optical Pattern Recognition VI
David P. Casasent; Tien-Hsin Chao, Editor(s)

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