Abstract
Striations and sectors in the KTP crystals grown from high-temperature tungsten-containing solutions were optically observed. Inhomogeneous distribution of tungsten across the striae and the boundary between the sectors was revealed in an SEM by electron probe microanalysis using a multiple linescan method. It was concluded that the striations in the crystals result from the unequal incorporation of tungsten during the growth process, caused by temperature fluctuations. Experiments to create induced striations in KTP crystals were performed in order to evaluate the temperature fluctuation amplitude below which no striae are optically distinguished. It was established that the striae are already scarcely visible when the fluctuation amplitude is 0.12°oC.
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