Light-induced photorefraction changes in nonstoichiometric lithium niobate crystals

Sergey M. Kostritskii; O. G. Sevostyanov

doi:10.1117/12.239205

29 April 1996 Light-induced photorefraction changes in nonstoichiometric lithium niobate crystals

Sergey M. Kostritskii, O. G. Sevostyanov

Proceedings Volume 2795, Nonlinear Optics of Liquid and Photorefractive Crystals; (1996) https://doi.org/10.1117/12.239205
Event: Nonlinear Optics of Liquid and Photorefractive Crystals, 1995, Ai-Danil, Crimea, Ukraine

Abstract

The results of the detailed investigation of influence of the composition compound variation on photorefractive effect in nominally pure LiNbO₃ crystals at continuous-wave illumination are reported. The investigation indicates clear photorefraction amplitude (Delta) n_s increase with the growth of the light intensity J for any studied crystals. The main result of our investigation consists in discovering of a direct linear correlation between (delta) ((Delta) n_s)/(delta) J and density N of such intrinsic defects as Nb_Li. This effect is independent from the accidental iron contamination. Therefore at low J the (Delta) n_s value decreases with growth N while at high J the opposite dependency is observed. The threshold intensity value of such transformation correlates with the crystal optical quality. It has been established that these photorefraction changes are connected with the light induced absorption on the secondary centers caused by the existence of the metastable small polarons at room temperature during illumination.

Citation Download Citation

Sergey M. Kostritskii and O. G. Sevostyanov "Light-induced photorefraction changes in nonstoichiometric lithium niobate crystals", Proc. SPIE 2795, Nonlinear Optics of Liquid and Photorefractive Crystals, (29 April 1996); https://doi.org/10.1117/12.239205

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