Abstract

We report the beam-coupling properties of a cobalt-doped oxygen-reduced n-type barium titanate crystal in the 0° and 45° crystallographic orientations. Oxygen reduction improved the response time of the 0°-cut crystal by a factor of ~4.5 without diminishing the beam-coupling gain. The 45°-cut crystal has a peak gain of ~38.7 cm⁻¹, a response time of ~21 ms, and a photorefractive sensitivity of 3.44 cm³/kJ. We infer from response time measurements an equivalent percentage change in the dc dielectric constant and the mobility with respect to crystallographic orientation.

© 1992 Optical Society of America

Self-pumped phase conjugation and four-wave mixing in 0°- and 45°-cut n-type BaTiO₃:Co

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