Phase conjugation of low-power optical beans using liquid-crystal light valves

A real-time hologram generated in the liquid-crystal layer of a leaky-mirror silicon light valve is read by the same low-intensity beams used to record it. For a particular geometry, one of the diffracted beams propagating away from the device is the optical phase conjugate of one of the original beams, thus permitting correction of pathpropagation aberrations. Experimental results show correction of tilt, focusing error, and random phase aberrations.