We report on the study of photorefractive properties of as-grown nominally pure lithium niobate and tantalate crystals using whispering gallery mode (WGM) resonators. The photorefractive effect manifests itself as a dynamic modification of the spectrum of the resonator, which includes the relative motion of various families of WGMs in the frequency space. We have observed the effect in near (7800.3em0exnm) as well as in the far (15500.3em0exnm) infrared. Our experiments support the conclusion that the photorefractivity does not have a distinct red boundary. We show that the maximum saturated refractive index change in the infrared is of the same order of magnitude as in the visible light.
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Savchenkov et al. (2006) studied this question.
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