Neto LG, Roberge D, Sheng Y. Full-range, continuous, complex modulation by the use of two coupled-mode liquid-crystal televisions.
APPLIED OPTICS 1996;
35:4567-76. [PMID:
21102875 DOI:
10.1364/ao.35.004567]
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Abstract
Switchable, continuous, complex-amplitude modulation is demonstrated with two cascaded, twisted nematic liquid-crystal televisions (LCTV's), both operating in phase- and amplitude-coupled modulation modes. The condition for full-range complex modulation is that one of the LCTV's must provide a 2π-range phase modulation. A look-up table encoding method is proposed that permits the compensation of phase-amplitude coupling and nonlinearity in the two individual LCTV modulations. Experimental techniques for determining the LCTV-device parameters, for maximizing the phase-mostly modulation range and the amplitude-mostly modulation contrast, and for testing the complex-amplitude modulation are developed. Optical complex-amplitude Fresnel holograms are shown.
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