不同Li/Nb比Mg:In:Fe:LiNbO_3晶体的光折变性能研究  

Study on Photorefractive Properties of Mg:In:Fe:LiNbO_3 Crystals with Various Li/Nb Ratios

作　　者：王佳[1] 王锐[1] 刘维海[1] 刘新荣[1] 

机构地区：[1]哈尔滨工业大学应用化学系,哈尔滨150001

出　　处：《人工晶体学报》2006年第5期1012-1015,共4页Journal of Synthetic Crystals

基　　金：哈尔滨市科技攻关项目(2005AA5CG058)

摘　　要：采用提拉法生长了不同L i/Nb比(L i/Nb=0.85,0.94,1.05,1.20,1.38)的Mg:In:Fe:L iNbO3(LN)单晶。测试了Mg:In:Fe:LN晶体的红外透射光谱,紫外吸收光谱,抗光致散射能力,响应时间和指数增益系数。实验结果显示:L i/Nb=0.85晶体的OH-吸收峰在3481 cm-1附近,L i/Nb=0.94、1.05、1.20的晶体的OH-吸收峰在3505 cm-1附近,而L i/Nb=1.38晶体的OH-吸收峰有三个,分别在3466 cm-1、3481 cm-1和3518 cm-1附近。随着L i/Nb比的增大,晶体的紫外吸收边发生紫移,抗光致散射能力增强,响应速度加快,指数增益系数增大。结果表明:L i/Nb=1.38的晶体是性能最为优良的光折变晶体材料。Mg： In： Fe ： LiNbO3 crystals with various Li/Nb ratios （ Li/Nb = 0.85,0.94,1.05,1.20,1.38） have been grown by Czoehralski technique. The infrared transmittance spectra, the absorption spectra, photo scattering resistance ability, response time and exponential gain coefficient were measured. The results show that the OH^- absorption peak of the crystal with Li/Nb =0.85 is near 3481cm^-1, the OH^- absorption peak of the crystals with Li/Nb =0.94,1.05,1.20 moved to 3505cm^-1 ,While the crystal with Li/Nb =1.38 have three peaks： 3466cm^-1,3481cm^-1and 3518cm^-1. With the Li/Nb ratios increasing,the absorption edge shift to the violet ,photo scattering resistance ability ,response speed and exponential gain coefficient improved. The results show that the crystal with Li/Nb = 1.38 is the more excellent photorefractive material.

关 键 词：Mg:In:Fe:LiNbO3 晶体 抗光致散射能力 响应时间 指数增益系数 

分 类 号：O734[理学—晶体学]