Abstract

We present two-beam coupling experiments in the nanosecond regime at 1.06 ?m , using photorefractive BaTiO<sub>3</sub>:Rh. The maximum observed exponential gain coefficient is 14.2 cm<sup>-1</sup> . No intensity-dependent electron–hole competition and no strong saturation of the photoionized charge carriers are observed for intensities of less than 20MW cm<sup>-2</sup> . The energy required for recording the photorefractive grating is not significantly different in the nanosecond and the cw regimes.

© 1997 Optical Society of America

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