We present a closed-loop adaptive-optics system that uses a liquid-crystal television (LCTV) as a phase retarder. The system consists of a LCTV inserted into one leg of a Mach-Zehnder interferometer so that one measures the wave-front function by analyzing the interferogram using a video CCD camera and a computer and corrects the wave-front distortion by placing the conjugate function on the LCTV. Experimental results are presented.
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Dou et al. (1995) studied this question.
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