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A model is proposed for photo-and thermally induced processes in lithium niobate crystals. The model is based on the presence of structural defects formed as a result of departure of the crystal composition from stoichiometry. Defects of the type Nb Li -Nb Li are introduced and the influence of oxidation-reduction heat treatment on the optical characteristics of the crystals is analyzed.
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Akhmadullin et al. (1998) studied this question.
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