Ti:Fe:LiNbO_3晶体的生长及其光折变性能的研究  

Growth and Photorefractive Effect of Ti and Fe Co-doped LiNbO_3 Crystal

作　　者：董斌[1] 徐良瑛[1] 束碧云[1] 肖兵[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》1998年第3期296-302,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金!69577021

摘　　要：采用熔体提拉法生长了不同掺杂浓度的Ti：Fe：LiNbO3晶体．研究了掺杂杂质离子浓度变化对晶体光折变性能的影响，测定了晶体经热化学还原处理前后的透射谱．用ESR方法证实，未经还原处理时，Ti：Fe：LiNbO3晶体中Ti离子以Ti4+形式存在．与Fe：LiNbO3和Ti：LiNbOa相比，Ti、Fe复合掺杂，通过电荷补偿效应，使未经还原处理的晶体中Fe2+增加，从而使光吸收增强；可以通过改变Ti、Fe掺杂浓度的方法来控制晶体中Fe2+离子的浓度，达到控制并改善晶体光折变性能的目的．本文还对Ti：Fe：LiNbO3晶体的全息性能进行了研究，测得Ti：Fe：LiNbO3晶体响应时间缩短，衍射效率高达90％以上．Ti：Fe：LiNbO3晶体是一种优质的光折变材料．Ti and Fe co-doped LiNbO3 crystals were grown from the melt by Czochralski method. Theinfluence of different doping concentration on photorefractive effect was studied, the optical transmission spectra before and after reduction treatment were measured too. It was confirmed byESR method that Ti ion exists in untreated Ti: Fe: LiNbO3 crystals in the form of Ti4+. Itwas supposed that the Fe2+ concentrations increase in untreated Ti: Fe: LiNbO3 crystal due tocharge compensation effect. Without reduction treatment, the concentration of Fe2+ in crystalscan be controlled by Ti dopping. The diffraction efficiency, which can be high up to over 90.00%,was also measured by using two-wave coupling technique. Ti: Fe: LiNbO3 crystal is a good newphotorefractive material.

关 键 词：提拉法 晶体生长 光折变效应 

分 类 号：O782.5[理学—晶体学] O734.2