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Quantum Electronics and Laser Science Conference

Photoinduced phase profiles by a dark stripe and a circular dark spot intensity distributions in a photorefractive Bi/sub 12/TiO/sub 20/ crystal

G. S. García Quirino, Marcelo David Iturbe Castillo, J. J. Sánchez-Mondragón, Serguei I. Stepanov

Published Jun 7, 1996• 0 citations
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Abstract

Summary form only given. We present experimental results on the interferometric analysis of the photoinduced phase changes produced by a 1D dark stripe and a 2D dark circular spot intensity distributions. These kind of intensity distributions are typical for dark spatial soliton generation.

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Experimental observation of one dimensional (1D) and two dimensional (2D) bright and dark spatial soliton propagation has been reported in photorefractive media [1,2]. The experiments were performed under externally applied dc field, which clearly sets some particular direction in the plane perpendicular to the axis of soliton propagation. In this paper we present experimental results on the interferometric analysis of the photoinduced phase changes produced by a 1D dark stripe and a 2D dark circular spot intensity distributions These kind ot intensity distributions are typical for dark spatial soliton generation.
It is known that two-wave coupling in photorefractive crystal may result in an intensity-dependent phase shift as well as energy transfer between the two waves without phase crosstalk. In a sense, this kind of phase shift is similar to the intensity-dependent refractive-index effects in Kerr media. Consequently, optical bistability can be established in an optical cavity with a photorefractive crystal. We formulate the model and get the expected bistable transmission with numerical simulations. Several cases, including that of the codirectional coupling and the contradirectional coupling, are considered. The effects of the photorefractive crystal’s distribution absorption and the spatial phase shift between the index grating and the light interference pattern in the crystal on the nonlinear transmission characteristics have also been studied. It is interesting to note that the output of the pumping wave is dependent on the cavity intensity and thus shows bistable behavior with respect to the cavity input as well.