Abstract

We discuss the writing of a photorefractive grating with pulses much shorter than the diffusion time of photoexcited charge carriers and compare the results with experiments performed in reduced KNbO₃ crystals. From the grating-spacing dependence of the observed buildup time and diffraction efficiency we show that the lifetime of the photoexcited electrons is approximately 4 ns and that the mobility of these electrons before trapping is 0.4 ± 0.2 cm²/(V s).

© 1992 Optical Society of America

Photorefractive effect in crystals with a nonlinear recombination of charge carriers: theory and observation in KNbO₃

D. Fluck, P. Amrhein, and P. Günter
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High photorefractive sensitivity at 860 nm in reduced rhodium-doped KNbO₃

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Photorefractive charge compensation at elevated temperatures and application to KNbO₃

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