A spatial filtering technique has been demonstrated for contrast enhancement. Coherent light transmitted through a liquid crystal device is Fourier transformed. Undeviated (or deviated) light is spatially filtered at the Fourier transform plane, giving a high-contrast positive (or negative) image. The method is applicable to any type of liquid crystal whose light-deviating properties depend upon external stimuli.
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Caulfield et al. (1971) studied this question.
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