Abstract

A new two-wave-mixing interaction with gain through a Bi12SiO20 liquid-crystal light valve is presented. We show that the diffraction of a pump beam in the direction of a weak signal leads to a net amplification of the signal beam, with no need for a phase shift between the interference pattern and the induced index grating. A two-wave-mixing gain of 10 and a 150-ms response time are obtained with a 8.8-µm-thick liquid-crystal layer, a total intensity of the interacting beams of only 200 µW/cm2, and an ac external voltage of ±6 V. Image amplification is also demonstrated.

© 1997 Optical Society of America

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