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利用助熔剂提拉法 ,分别从掺入 11mol%K2 O的同成份LiNbO3 熔体中和从掺入 19mol%K2 O的化学配比LiNbO3 熔体中生长出高质量近化学计量比LiNbO3 单晶。对这两种从不同配比熔体中生长的晶体进行光谱分析表明 ,与同成份比LiNbO3 相比较 ,其紫外吸收边出现明显蓝移 ,OH红外吸收峰的位置和线宽也都有显著的变化。室温极化反转测试显示 ,两种晶体的矫顽场分别为 4.4kV/mm和 0 .8kV/mm。根据所得测量结果 ,估计两种晶体中Li2 O的含量分别为 49.6mol%和 49.9mol%。其中从掺 19mol%K2 O化学配比LiNbO3 熔体中生长出的LiNbO3 单晶的Li2 O含量已非常接近 5 0mol%的化学配比。进一步优化生长工艺 ,获得成份均匀、大尺寸化学计量比晶体的工作正在进行中。
High-quality near-stoichiometric LiNbO3 single crystals were grown from the same composition LiNbO3 melt doped with 11mol% K2O and the stoichiometric LiNbO3 melt doped with 19mol% K2O, respectively, using a flux pulling method. Spectral analysis of these two kinds of crystals grown from different melt mixtures showed that there was a significant blue shift in the UV absorption edge compared with LiNbO3 with the same composition, and the location and line width of the OH infrared absorption peak were also significant Variety. The room temperature polarization inversion test showed that the coercive fields of the two crystals were 4.4 kV / mm and 0.8 kV / mm, respectively. Based on the measurement results obtained, the contents of Li2O in both crystals were estimated to be 49.6 mol% and 49.9 mol%, respectively. The Li 2 O content of LiNbO 3 single crystal grown from melt doped with 19 mol% K 2 O stoichiometry LiNbO 3 has very close to 50 mol% stoichiometry. Further optimization of the growth process to obtain a uniform composition, large-size stoichiometry than the work of the crystal is in progress.