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Photorefractive gratings can be induced by laser illumination. They have been observed so far using optical methods. In this paper we report the direct measurement of the space charge distribution associated with such a grating, using the pressure wave propagation method. The wavefront of a pressure wave travelling through the sample acts as a virtual probe sensitive to electrical charge or field. The photorefractive grating was produced by means of a spatial distribution of linear polarization of laser light.
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Shlensky et al. (1992) studied this question.
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