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A new photoelectric reorientation effect for the realization of highly sensitive photorefraction in liquid crystals

The present investigations concern a new molecular reorientation effect in nematic liquid crystals consisting of discotic molecules. The effect occurs under the combined application of DC-electrical fields and low power optical waves and has a very huge photosensitivity. An illumination with intensities as low as 10/sup -5/ W/cm/sup 2/ is sufficient for a strong photo-induced reorientation process which indicates a rather large nonlinear optical coefficient.