Abstract
Current research and development in optical imaging, computing, communication and signal processing and switching have focused considerable efforts on highly efficient nonlinear optical and electro-optical materials. In combination with novel nonlinear optical processes and cw or pulsed lasers covering a wide spectral range, several useful practical devices have been developed. In particular, optical switching elements and logic gates1,2, infrared-to-visible image converter, real time image correlators, image or beam amplifiers3, nonlinear guided wave structures, optical memory devices (e.g., associative memory by phase conjugation4) and various beam steering and beam combining devices5 have been proposed and demonstrated. Concommitant to these device developments, optimization procedures and system requirement considerations have narrowed the "ideal" nonlinear optical materials to a few classes, such as semiconductors, photorefractive crystals and organic materials6. Several of these materials are still in the research phase, although they have been shown to possess many desirable characteristics (such as high speed and low energy requirements).
© 1988 Optical Society of America
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