Mg：Zn：LiNbO3晶体光损伤和倍频性能的研究  

Study on the Photo Damage and Second Harmonic Generation Property of Mg:Zn:LiNbO_3 Crystals

作　　者：毕建聪[1] 刘波[1] 李春亮[1] 徐玉恒[2] 尹红[3] 

机构地区：[1]哈尔滨理工大学化学与环境工程学院,黑龙江哈尔滨150040 [2]哈尔滨工业大学应用化学系,黑龙江哈尔滨150001 [3]四川压电与声光技术研究所,重庆400060

出　　处：《压电与声光》2009年第3期408-410,413,共4页Piezoelectrics & Acoustooptics

摘　　要：以Czochralski技术生长Mg(3%)∶Zn∶(x%)∶LiNbO3(x=1,2,3)(摩尔分数)。测试晶体光损伤阈值,Mg(3%)∶Zn(3%)∶LiNbO3晶体光损伤阈值比LiNbO3晶体提高了2个数量级以上。测试晶体红外光谱Mg(3%)∶Zn(3%)∶LiNbO3晶体OH-吸收峰位置由LiNbO3的3 482 cm-1移到3 532 cm-1,即晶体掺杂达到阈值浓度。采用角度匹配,测试晶体的倍频转换效率。激光功率密度很高时,晶体出现暗迹,倍频转换效率下降,暗迹是由倍频光引起,与基频光无关。氧化的晶体可以减弱暗迹。对晶体光损伤阈值的增强,OH-吸收峰的移动,暗迹产生的机理进行阐述和研究。Mg（3 %） ： Zn（x%） ： LiNbO3 （x= 1,2,3） crystals have been grown by Czochralski method. By testing the crystalg photo damage thresholds,we found that the threshold of Mg（3%） ： Zn（3%） ： LiNbO3 increases over two orders of magnitude than that of LiNbO3 crystal. The OH^- absorption band of Mg（3%） ： Zn（3%） ： LiNbO3 shifted from 3 482 cm^-1 to about 3 532cm^-1 when doping concentration reaches the threshold. The second harmonic generation （SHG） property of the crystals was investigated by the angle matching. It was found that when the laser power density was high, there would be dark spatial solitons in crystal, and the conversion efficiency of the second harmonic generation will decline. The dark spatial solitons were caused by SHG light and had nothing to do with the fundamental frequency light. Oxidation of the crystal can decrease the dark spatial solitons. The crystal optical damage threshold increase,the OH^- absorption peak shift and the mechanism of dark spatial solitons were also discussed in this article.

关 键 词：Mg:Zn:LiNbO3^-晶体 光损伤 倍频 

分 类 号：O734[理学—晶体学]