【作者】 王义杰； 于海涛； 刘威；

【Author】 WANG Yi-jie YU Hai-tao LIU Wei (Applied Science College,Harbin University of Science and Technology,Harbin 150080,China)

【机构】 哈尔滨理工大学应用科学学院；

【摘要】 采用提拉法生长4种不同[Li]/[Nb]比（0．94, 1．05,1．20,1．38）的 Ce（0．1％（质量分数））：Mn（0．05％（质量分数））：LiNbO₃晶体和掺镁量为5％（摩尔分数）的 Mg：Ce（0．1％）：Mn（0．015％）：LiNbO₃晶体．测试晶体红外光谱,[Li]/[bib]为1．2和1．38的 Ce：Mn：LiNbO₃ 晶体 OH^-吸收峰移到3466cm^-1,这是化学计量比的标志吸收峰．Mg（5％（摩尔分数））Ce：Mn：LiNbO₃晶体 OH^- 吸收峰移到3535cm^-1,这是 Mg²⁺达到阈值浓度的标志吸收峰．以锂空位模型解释 OH—吸收峰移动机理．采用光斑畸变法测试晶体抗光损伤能力,采用二波耦合光路测试晶体的指数增益系数、响应时间、计算载流子浓度．随着[Li]/[Nb]比增加,这些数据指标增加．[Li]/[Nb] 为1．38,Cc：Mn：LiNbO₃晶体是化学计量比,它的指数增益系数比 Ce：Mn：LiNbO₃晶体提高1倍,响应速度和抗光损伤能力提高1个数量级以上,是性能最为优良的光折变晶体材料之一．更多还原

【Abstract】 In this paper,four Ce（0.1mass %）:Mn（0.015 mass %）:LiNbO₃ crystals with various Li/Nb ratios（0.94, 1.05,1.20,1.38）and Mg:Ce（0.1 mass %）:Mn（0.015 mass %）:LiNbO₃crystals with doping Mg²⁺（5 mol %）were grown by Czochralski method.The infrared spectra of the crystals were measured.The results show that the O（?） absorption peaks of Ce:Mn:LiNbO₃ with Li/Nb ratio of 1.2 and 1.38 shift to 3466cm^-1,which is the marker peak of the stoichiometric LiNbO₃.The marker peak at 3535 cm^-1of MgO threshold value is revealed in Mg（5mol%）:Ce:Mn: LiNbO₃ crystal.The mechanism of the O（?）absorption peak was disscussed by the Li-vacancy model The optical damage resistant properties were measured by faclua-distoritium method.The exponential gain coefficient,the response time and the effect carrier concentration of the crystal were measured by the two-wave coupling experiment.The results show that these measured parameters are increase with the increase of Li/Nb ratio,and the exponential gain coefficient of Ce:Mn: LiNbO₃ crystal with Li/Nb ratio of 1.38 is two times larger than that of the congruent crystal.In particular,the response time and photodamage resistant ability of stoichiometric Ce:Mn:LiNbO₃ crystal are one order of magnitude higher than that of other crystals.The stoichiometric Ce:Mu:LiNbO₃ crystal is an excellent photorefractive material.更多还原