Abstract
The sytem we investigated is called phase-conjugate ring-resonator (PCR). It consists of a Sagnac interferometer and a phase-conjugate mirror (PCM) realized by four-wave mixing in a photorefractive BaTiO3-crystal. Since the PCM provides nonlinear gain and high amplification, the PCR forms a nonlinear, active feedback system with a large image plane and a high resolution [1].
© 1990 Optical Society of America
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