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Proceedings Paper

Light-induced photorefraction changes in nonstoichiometric lithium niobate crystals
Author(s): Sergey M. Kostritskii; O. G. Sevostyanov
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Paper 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) ns 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) ns)/(delta) J and density N of such intrinsic defects as NbLi. This effect is independent from the accidental iron contamination. Therefore at low J the (Delta) ns 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.

Paper Details

Date Published: 29 April 1996
PDF: 12 pages
Proc. SPIE 2795, Nonlinear Optics of Liquid and Photorefractive Crystals, (29 April 1996); doi: 10.1117/12.239205
Show Author Affiliations
Sergey M. Kostritskii, Kemerovo State Univ. (Russia)
O. G. Sevostyanov, Kemerovo State Univ. (Russia)


Published in SPIE Proceedings Vol. 2795:
Nonlinear Optics of Liquid and Photorefractive Crystals
Gertruda V. Klimusheva; Andrey G. Iljin, Editor(s)

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