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在同成分LiTaO3熔体中掺入一定剂量的K2O,采用顶部籽晶提拉法生长掺镁近化学计量比LiTaO3晶体。对晶体分别进行光谱分析,畴结构和抗光损伤阈值的测定。结果表明:与同成分掺镁LiTaO3晶体相比较,其紫外吸收边出现明显蓝移,红外吸收峰变弱。腐蚀晶片的晶相显微镜观察结果表明:掺镁近化学剂量比晶体的畴结构是较为规则的六边形;晶体的抗光致散射能力明显提高。
In the same composition LiTaO3 melt doped with a certain dose of K2O, the top of the crystal pulling growth Mg-doped nearly stoichiometric LiTaO3 crystals. Spectral analysis of the crystal, domain structure and light damage threshold determination. The results show that: compared with the same composition MgO doped LiTaO3 crystal, there is a clear blue shift of the UV absorption edge, and the infrared absorption peak becomes weaker. The results of the phase microscope observation of the eroded wafer show that the domain structure of Mg-doped near-chemical dose is more regular hexagonal than that of the crystal, and the anti-photodissociation ability of the crystal is obviously improved.