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    Nonlinear response of photorefractive lithium tantalate and niobate at acoustic frequencies

    An amplification of the intensity of pump oscillations is observed experimentally at frequencies from 100 Hz to 1 kHz during photoinduced light scattering and holographic-type parametric scattering in photoref...

    P. A. Prudkovskii, O. V. Skugarevskii in Journal of Experimental and Theoretical Ph… (1997)