Full-complex modulation spatial light modulator using two coupled-mode modulation liquid crystal televisions

Danny Roberge; Luiz Goncalves Neto; Yunlong Sheng

doi:10.1117/12.205800

28 March 1995 Full-complex modulation spatial light modulator using two coupled-mode modulation liquid crystal televisions

Danny Roberge, Luiz Goncalves Neto, Yunlong Sheng

Author Affiliations +

Proceedings Volume 2490, Optical Pattern Recognition VI; (1995) https://doi.org/10.1117/12.205800
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

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.

Citation Download Citation

Danny Roberge, Luiz Goncalves Neto, and Yunlong Sheng "Full-complex modulation spatial light modulator using two coupled-mode modulation liquid crystal televisions", Proc. SPIE 2490, Optical Pattern Recognition VI, (28 March 1995); https://doi.org/10.1117/12.205800

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