This article is cited in 2 papers

Nonlinear optical phenomena

Manifestation of a photorefractive effect in Raman spectra of lithium niobate crystals of different compositions

N. V. Sidorov^a, P. G. Chufyrev^a, M. N. Palatnikov^a, N. N. Mel'nik^b, Yu. A. Zheleznov^c, V. Yu. Khomich<sup>c

a</sup> Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials Kola Science Centre of the Russian Academy of Sciences
^b P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
^c Institute of Problems of Electrophysics of the Russian Academy of Sciences, Moscow

Abstract: The ordering of structural units in a cation sublattice and the photorefractive properties of lithium niobate single crystals of different compositions: nominally pure with different [Li]/[Nb] ratios and doped with non-photorefractive cations Mg²⁺, Gd³⁺, and Y³⁺, are studied by their Raman spectra. It is shown that at low concentrations of Mg²⁺, Gd³⁺, and Y³⁺, the magnitude of the photorefractive effect is determined by the ordering of the structural units of the cation sublattice. It is found for the first time that the intensity of a Raman line corresponding to the bridge valence vibrations of oxygen atoms in the NbO₆ octahedra is sensitive to the dipole ordering of the cation sublattice.

PACS: 42.65.Dr, 42.65.Hw, 42.70.Mp

Received: 09.06.2004

 English version: Quantum Electronics, 2004, 34:12, 1177–1179

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