Abstract
We propose an optical circuit unit consisting of two beam splitters and two Ba- TiO3 phase conjugate mirrors (PCMs). The reflective gain of a PCM is up to 260% using r42 electrooptic coefficient. Circuits of this type can be connected in cascade because of the high gain. An input beam goes to the first PCM (PCM1) through the beam splitter, and its amplified reflected beam is led to the second PCM (PCM2). As the two PCMs are connected by the two beam splitters, a feedback loop is constructed between them. PCM1 forms a phase conjugate (PC) image of the input in the mask plane, and PCM2 forms a PC image of this PC image, that is, it reconstructs the original in the output plane. Because of the beam splitters a beam passes back and forth between the two PCMs. In the mask plane, the PC image by PCM1 and the original image by PCM2 coincide although they propagate in opposite directions. Controlling transmittance of the mask, we can perform a nonlinear operation to the input image with this feedback system.
© 1989 Optical Society of America
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