Photoinduced currents responsible for the photorefractive process in reduced and oxidized LiNbO3 : Fe crystals have been investigated in the spectral range between 1.5 and 4.0 eV. Optical erasure has also been studied by measuring the decay of a photoinduced phase grating during illumination with incoherent light. In comparison to optical absorption these spectra yield information on energy levels of photorefractive centers.
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Kurz et al. (1975) studied this question.
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