Two-photoactive-center model applied to photorefractive self-focusing in biased LiNbO3 - Archive ouverte HAL Access content directly
Journal Articles Physical Review A : Atomic, molecular, and optical physics [1990-2015] Year : 2010

Two-photoactive-center model applied to photorefractive self-focusing in biased LiNbO3

Abstract

We propose a time-dependent, three-dimensional numerical model where iron impurities and polarons are both considered photoactive centers to explain beam self-trapping in biased lithium niobate crystal. It shows that the intensity-dependent behavior reported experimentally is due to the competition between the drift current and the nonlinear photovoltaic current. For low light intensity, beam self-focusing occurs, while beam-splitting is observed at a higher intensity level.
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hal-00476907 , version 1 (11-05-2021)

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F. Devaux, J. Safioui, M. Chauvet, R. Passier. Two-photoactive-center model applied to photorefractive self-focusing in biased LiNbO3. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2010, 81 (1), pp.013825. ⟨10.1103/PhysRevA.81.013825⟩. ⟨hal-00476907⟩
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