Abstract
The properties of laser-induced gratings were characterized in doped LiNbO3 crystals using small-angle scattering pattern analysis, the analysis of erasure decay patterns, and two-beam mixing. The results show the usefulness of each of these types of experimental techniques in obtaining different types of information about the photorefractive response of the material. The samples investigated included crystals doped with copper, erbium, magnesium, and hydrogen. The results obtained on a series of Mg-doped crystals showed a strong increase in the charge relocation rate at high concentration levels resulting in a decrease in the grating modulation depth. The results of the two-beam mixing experiments are consistent with increased conductivity in the samples with high Mg concentrations.
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