Abstract

We report measurements on spatial and temporal properties of a cw phase-conjugate resonator (PCR) based on the photorefractive crystal BaTiO3 and pumped with millwatt power levels from a He–Ne or a Kr+-ion laser. In the absence of an intracavity aperture, the output beam is observed to be elongated in the direction of the crystal c axis by means of preferential self-defocusing of the beam by the highly anisotropic photorefractive effect in BaTiO3. When the coherence length of the pump laser is much smaller than the round-trip distance in the PCR, the time constants for buildup and decay of the PCR power are found to be much larger than those of the photorefractive response.

© 1982 Optical Society of America

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