Abstract
Gadolinium calcium oxide borate GdCa4O(BO3)3 melts congruently, and single crystals with diameters of up to 35 mm and lengths of up to 70 mm were grown by the Czochralski method. Deformation of the crystal structure was observed. X-ray topography and conoscopic and polariscopic investigations revealed the core situated in the central part of the crystal, which was not visible with the naked eye. The relative (b/bav) difference in the lattice parameter b in the core region compared with the neighboring crystal areas was evaluated to be on the order of 9.6 × 10−4. Outside of the core region the mean value of the lattice parameter is constant, while fluctuations in spatial distribution of the Bragg angle were discovered. The effect of growth instabilities causes a certain deformation of the growth plane (interface). However, it did not disturb optical properties, and was quite a good crystalline area to yield a considerable second harmonic (532 nm) power in laser experiments.
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