Abstract

We report the observation of self-pumped phase conjugation by means of internal reflection in a photorefractive medium produced by a series of intense nanosecond pulses. Nanosecond pulses from a YAG laser ranging in intensity from 9 × 10⁴ to 9 × 10⁵ W/cm² were used. The crystal was rhodium-doped strontium barium niobate. The conjugate signal began with the first pulse, and the time to reach 63% of its equilibrium value scaled as I⁻². The equilibrium reflectivity was 29%. A similar cw experiment with the 514-nm line of an argon laser produced a response time that scaled as I^−1.1.

© 1990 Optical Society of America

Mutually pumped phase conjugation in photorefractive strontium barium niobate: theory and experiment

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