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Liquid crystal light valve using bulk mono-crystalline Bi12SiO20 as the photoconductive material

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Abstract

The substrates which close the cell are, respectively, a glass plate and the bulk photoconductive BSO crystal (2 mm thick). The nematic liquid crystal (pentylcyanobiphenil PCB, 15 μm thick) is aligned by obliquely evaporating a thin film of silicon monoxide. Two transparent electrodes are layered to apply a longitudinal ac voltage. Information writing on the light valve is obtained with a source whose output wavelength corresponds to the optimum spectral sensitivity range of the BSO (λw≃450 nm). Visualization of the 2-D field distribution is obtained on the readout beam with crossed polarizers. Electrical behavior of the light valve under ac voltage operation is explained in terms of space charge limited currents through the BSO. The equivalent electrical circuit of the light valve will be derived from the BSO electrical impulse response under uniform illumination.

© 1981 Optical Society of America

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