A twisted nematic liquid-crystal television (LCTV) has been used together with Twyman?"Green type interferometers to measure and compensate the phase distortion of a wave front. The twisted nematic LCTV has been operated as a phase-only modulator, and its phase retardation ability has been doubled in these experiments. The phase function of a phase object has been measured in different arrangements of the experimental setup.
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Dou et al. (1996) studied this question.
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