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We describe several ways to use photorefractive phase conjugators as thresholding elements for optical associative memories. The first involves background illumination of the crystal of a self-pumped phase conjugator. The second method uses a photorefractive phase conjugator designed so that its reflectivity increases with increasing signal strength. The third method uses semi-self-pumped phase conjugators in which one pump is externally provided as a thresholding reference and the other is self-induced as an oscillation beam. Two examples are the double phase conjugate mirror and a new type of phase conjugator based on injection of a counterpropagating pump beam into a unidirectional ring resonator.
Mark Cronin-Golomb andAmnon Yariv
"Phase Conjugate Mirrors As Thresholding Elements For Optical Associative Memories", Proc. SPIE 0700, 1986 Intl Optical Computing Conf, (8 January 1987); https://doi.org/10.1117/12.936993
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Mark Cronin-Golomb, Amnon Yariv, "Phase Conjugate Mirrors As Thresholding Elements For Optical Associative Memories," Proc. SPIE 0700, 1986 Intl Optical Computing Conf, (8 January 1987); https://doi.org/10.1117/12.936993