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After a brief overview on basic analog optical operations we present image amplifiers being realized by two- and four-wave mixing in photorefractive BaTiO3. We summarize some optical operations with photorefractive elements and present for the first time an image transmitting optical feedback system with gain by a phase-conjugating mirror.
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A. Herden, H. Klumb, F. Laeri, T. Tschudi, J. Albers, "Analog Optical Computing," Proc. SPIE 0700, 1986 Intl Optical Computing Conf, (8 January 1987); https://doi.org/10.1117/12.936956