1 September 1986 Simplified Band Transport Model Of The Photorefractive Effect
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Abstract
The simplified band transport model of the photorefractive effect in which the material responds linearly to local changes in light intensity modulation ratio (fringe contrast) is examined in detail. The validity of the model for cosinusoidal grating formation is first discussed with reference to frequency and time dependence. The "hopping" model of the photorefractive effect is then considered. It is shown that, although physically distinct from the band trans-port model, the hopping model may be considered as a special case of the band transport equations. Results of a numerical simulation of the band transport model are presented that illustrate the validity of the linear in modulation approximation. The band transport model is then extended to describe non-plane-wave interactions and to include a tensor static permittivity. Features of this extended model are emphasized by some experimental results. These results show the effect of nonuniform beam intensity profiles on apparent time constants as measured in four-wave mixing experiments using photorefractive Bi12SiO20-
R. Jaura, R. Jaura, T. J. Hall, T. J. Hall, P. D. Foote, P. D. Foote, } "Simplified Band Transport Model Of The Photorefractive Effect," Optical Engineering 25(9), 251068 (1 September 1986). https://doi.org/10.1117/12.7973956 . Submission:
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