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Quantum Electronics

Role of the local response of a photorefractive medium in the formation of a spatial screened soliton

S. A. Asselborn, Наталия Дмитриевна Кундикова, I V Novikov

Published Sep 30, 2008• 0 citations
Publisher

Abstract

The propagation of intensity-modulated laser radiation in a barium—sodium niobate crystal is studied in an external electric field. The possibility of controlling a nonlinear local response of the crystal is demonstrated. It is shown experimentally that the conditions of formation of a one-dimensional spatial soliton can be changed by varying the nonlinear response of the crystal.

DOI
10.1070/qe2008v038n09abeh013734

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Soviet Journal of Quantum Electronics•Dec 31, 1988•1 citation
The propagation of intensity-modulated laser radiation in a barium—sodium niobate crystal is studied in an external electric field. The possibility of controlling a nonlinear local response of the crystal is demonstrated. It is shown experimentally that the conditions of formation of a one-dimensional spatial soliton can be changed by varying the nonlinear response of the crystal.
The propagation of a light beam in a photorefractive crystal in an alternating meander electric field is studied. A nonlinear equation is obtained for a spatial charge field formed in the crystal upon modulation of the light intensity synchronously with the applied electric field. It is established theoretically that the spatial charge field has two components, which make contributions to different mechanisms of a photoresponse providing self-focusing and the appearance of spatial solitons, as well as the trajectory self-bending. The conditions are found at which the soliton regime is realised and parameters affecting this regime in a greater extent are determined.
A theoretical model is constructed for four-wave mixing in a photorefractive crystal where a transmission grating is formed by the drift–diffusion nonlinearity mechanism in the absence of an external electrostatic field and the response of the medium is nonlinear in respect of the modulation parameter. A comparison is made with a model in which the response of the medium is linear in respect of the modulation parameter. Theoretical models of four-wave and two-wave mixing are also compared with experiments.