Abstract
We analytically solve charge-transport equations for a photorefractive crystal with shallow and deep traps. We predict that, if shallow traps can accumulate a high density of charge, the photorefractive trap density and space-charge field will be strong functions of light intensity and the photoconductivity will scale sublinearly with intensity. We show that, depending on light intensity and grating spacing, shallow-trap charge gratings form either in phase or out of phase with the light pattern. As shallow traps thermally depopulate in the dark, the space-charge field either partially decays or partially develops for a few seconds. The amount of decay increases as grating spacing increases in Bi12SiO20 and as grating spacing decreases in BaTiO3.
© 1991 Optical Society of America
Full Article | PDF ArticleCorrections
Parviz Tayebati and Daniel Mahgerefteh, "Theory of the photorefractive effect for Bi12SiO20 and BaTiO3 with shallow traps: errata," J. Opt. Soc. Am. B 9, 177-177 (1992)https://opg.optica.org/josab/abstract.cfm?uri=josab-9-1-177
More Like This
D. Fluck, P. Amrhein, and P. Günter
J. Opt. Soc. Am. B 8(10) 2196-2203 (1991)
P. Tayebati
J. Opt. Soc. Am. B 9(3) 415-419 (1992)
M. H. Garrett, J. Y. Chang, H. P. Jenssen, and C. Warde
J. Opt. Soc. Am. B 9(8) 1407-1415 (1992)