We present experimental and theoretical results of photorefractive one-dimensional self-focusing in an Fe-doped crystal. The self-focusing is investigated by Z-scan experiments with and without an applied electric field. We observe the strongest focusing effect for a ratio of the beam peak intensity to the so-called dark intensity (the intensity at which photoconductivity is equal to the conductivity in the dark). The good agreement between the presented theory and experiment in the Z-scan technique allows the precise determination of dark intensity, the photovoltaic field, and the electric field inside the crystal.
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