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Infrared to visible Image conversion using four-wave mixing in a liquid crystal film

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Abstract

Infrared-to-visible image conversion via holographic processes1 or Bragg diffraction2 in a four- wave mixing geometry has been successfully demonstrated. Requirements for good image reproduction and resolution include the proper combination of material parameters (nonlinearity, absorption length, response times), phase-matching conditions, and geometry. In recent studies3 we have quantitatively shown that thin films (≈100 μm) of nematic liquid crystal possess extraordinarily large thermal nonlinearity for efficient degenerate four- wave mixing with nanosecond laser pulses. We report the first demonstration of IR-to-visible image conversion using the thermal nonlinearity of nematic film.

© 1985 Optical Society of America

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