Abstract

The dependence of the optimal electric biasing field and the diffraction efficiency on the thickness of the nematic thin film through the degenerate four-wave-mixing process is investigated. For relatively low optical pumps, the optimal bias monotonically increases with thickness, while corresponding diffraction efficiency increases at first and then decays for a thickness even less than 150 μm, which is well within the phase-matching regime. For stronger the pumps, the optimal bias can be doubly valued, and the curve of optimal bias versus thickness shows a closed loop. This behavior is unique to liquid crystals. The main mechanism is due to the twist effect of molecular orientation in addition to the scattering loss. Both the numerical and experimental results show these peculiar phenomena.

© 1993 Optical Society of America

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Quasi-static electric-field-enhanced degenerate four-wave mixing in a nematic liquid-crystal film

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