A photorefractive oscillation between two cascaded passive phase conjugate mirrors (2C-PPCM) with intracavity phase and amplitude modulation and multimode fibers is described. The two semilinear PPCM’s operate via four wave mixing in BaTiO3 crystals. A single beam pumps only one PPCM and generates all other self-starting beams of the two PPCM’s
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Fischer et al. (1986) studied this question.
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