We report on the study of near-infrared photorefractivity in highly Mg doped as-grown congruent LiNbO3 forming a whispering gallery mode resonator. The resonator is pumped with 780nm light. We have observed a change of the ordinary index of refraction of the material exceeding 8×10−5. We show that the basic features of the photorefraction in this type of crystal is different from the photorefraction in nominally pure as-grown congruent LiNbO3 and explain the origin of this difference.
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Savchenkov et al. (2006) studied this question.
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