A new method for characterization of periodically poled crystals is developedbased on spontaneous parametric down-conversion. The method is demonstrated oncrystals of Y:LiNbO3, Mg:Y:LiNbO3 with non-uniform periodically poledstructures, obtained directly under Czochralski growth procedure and designedfor application of OPO in the mid infrared range. Infrared dispersion ofrefractive index, effective working periods and wavelengths of OPO weredetermined by special treatment of frequency-angular spectra of spontaneousparametric down-conversion in the visible range. Two-dimensional mapping viaspontaneous parametric down-conversion is proposed for characterizing spatialdistribution of bulk quasi-phase matching efficiency across the input window ofa periodically poled sample.
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