The crystals with scheelite structure such as BaWO₄, SrMoO₄ are well-known Raman crystals, which are widely used in experimental studies and practical applications. Such non-linear optical materials with cubic nonlinearity and high SRS gain coefficient when being doped with Nd³⁺ ions can be also used as active medium and self-SRS shifter, simultaneously.

At present work the optical homogeneity of the crystals grown by Czochralski method and modified Stepanov technique was investigated. The values of anomalous birefringence were calculated and dependence of the thermal stresses on growth conditions was studied. The pictures of thermal stresses distribution along crystal boule were drawn and correlation with the crystal-melt interface form was shown. The photoelastic constants for the materials were experimentally estimated and the values of thermal stresses were obtained for different crystallization conditions.

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