Abstract

Continuous-wave phase conjugation of an image-bearing beam is demonstrated using a single-domain crystal of BaTiO3 and nothing else. The device operates by four-wave mixing using the photorefractive effect but without any external pumping beams or external mirrors. The customary pumping beams are derived from the incident beam and are internally reflected inside the crystal adjacent to an edge. The device is self-starting and has a phase-conjugate reflectivity of 30%. Imaging applications are discussed.

© 1982 Optical Society of America

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