【作者】 赵业权； 贾宝申； 张学锋； 申岩； 刘立人；

【Author】 ZHAO Yequan~1 JIA Baoshen~1 ZHANG Xuefeng~1 SHEN Yan~1 LIU Liren~2 (1 School of Astronautics,Harbin Institute of Technology,Harbin 15001; 2.Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

【机构】 哈尔滨工业大学航天学院； 中国科学院上海光学精密机械研究所；

【摘要】 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。更多还原

【Abstract】 Near-stoichiometric lithium tantalite （LiTaO₃）crystals doped with MgO were grown by the top-seed solution pulling method in congruent melt with the addition of K₂O.The crystals were characterized by measurement of the ultraviolet absorption edge,ability of photodamage resistance,infrared spectra and the domain structure analysis.The results show that compared with the congruent crystal with the same dopant,the ultraviolet absorption edge of the near-stoichiometric crystals has a blue shift towards a shorter wavelength and the inflated absorption peak becomes weaker.The domain structure of near-stoichiometric LiTaO₃ crystals is hexagonal,and the photodamage resistance of the crystals is greatly improved.更多还原