Abstract

A finite-difference technique was used to model photorefractive grating formations in sillenite crystals under nonstationary recording conditions of applied ac electric fields. These numerical results predict the magnitude, spatial distribution, and temporal evolution of the space-charge field at large modulations. The modulation-index-dependence of the magnitude of the fundamental component of the space-charge field was well described by the correction function f(m) = [1 − exp(−am)]exp(m). The value of the correction parameter a was correlated with crystal parameters and external conditions. These results were generalized to other crystal parameters and expressed as analytical functions that approximate the numerical solutions.

© 1992 Optical Society of America

Modulation dependence of the photorefractive response with moving gratings: numerical analysis and experiment

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Photorefractive response at high modulation depths in Bi₁₂TiO₂₀

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J. Opt. Soc. Am. B 9(8) 1449-1453 (1992)

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J. Opt. Soc. Am. B 6(4) 634-638 (1989)

Fundamental space-charge fields for applied alternating electric fields in photorefractive materials

A. Grunnet-Jepsen, C. H. Kwak, I. Richter, and L. Solymar
J. Opt. Soc. Am. B 11(1) 124-131 (1994)