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Neodymium gallium perovskite single crystals grown with the Czochralski method were examined with several complementary X-ray methods. By means of X-ray diffraction topography and reciprocal space diagram the structural perfection and crystal homogeneity of the studied wafers were determined. Additionally, the results of the X-ray reflectometry investigations of the surface perfection after the mechanochemical treatment are presented.

The results of experimental investigations on single crystal growth of lithium niobate for optical purposes are reported. The crystals were grown by the Czochralski method with the use of induction heated equipment type CGS-2 made by Spexon. The thermal system consisted of platinum crucible and active platinum afterheater.To determine the homogeneity and optical quality of single crystals the distribution of birefringence and of refractive indices n0 and ne were measured. Samples of active elements were prepared and their conoscopic images were checked. On the basis of these elements the electrooptic modulators were made for which extinction ratio and Vwere measured. Optoelectronic structures with cut-off effect on lithium niobate substrates were also prepared for straight and V waveguides. The waveguides were obtained by Ti in-diffusion.