非コングルエント組成LiNbO_3単結晶とLiTaO_3単結晶の耐光損傷特性(<特集>LN,LT結晶の育成と光損傷)

概要

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LiNbO_3 single crystals with various [Li]/[Mb] ratios were grown by the Czochralski method from melts having compositions varying between 45.5-58.0 mol% Li_2O. From X-ray topography and X-ray rocking curves, the crystal quality of off-congruent crystals was lower than that of the congruent crystal. The optical damage resistance decreases as the crystal composition approaches the stoichiometric value. Also, LiTaO_3 single crystals with low and high purity raw materials and doped with MgO were grown by the Czochralski method. The behavior of the photo-induced birefringence changes were similar to the LN crystal cases, but their damage resistances were weaker than that of LN crystals of the same grade.
日本結晶成長学会の論文
1993-09-25