高级检索
无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Ti:Fe:LiNbO3晶体的生长及其光折变性能的研究

董斌; 徐良瑛; 束碧云; 肖兵   

  1. 中国科学院上海硅酸盐研究所; 上海 200050
  • 收稿日期:1997-05-19 修回日期:1997-06-23 出版日期:1998-06-20 网络出版日期:1998-06-20

Growth and Photorefractive Effect of Ti and Fe Co-doped LiNbO3 Crystal

DONG Bin; XU Liang-Ying; SHU Bi-Yun; XIAO Bing   

  1. Shanghai Institute of Cerumics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1997-05-19 Revised:1997-06-23 Published:1998-06-20 Online:1998-06-20

PDF (PC)

1023

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：LiNbO3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．

关键词: Ti：Fe：LiNbO3, 提拉法晶体生长, 透射谱, 衍射效率, 光折变效应

Abstract: Ti and Fe co-doped LiNbO3 crystals were grown from the melt by Czochralski method. The influence of different doping concentration on photorefractive
effect was studied, the optical transmission spectra before and after reduction treatment were measured too. It was confirmed by ESR method that Ti
ion exists in untreated Ti: Fe: LiNbO3 crystals in the form of Ti4+. It was supposed that the Fe2+ concentrations increase in untreated Ti: Fe:
LiNbO3 crystal due to charge compensation effect. Without reduction treatment, the concentration of Fe2+ in crystals can 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 new photorefractive material.

Key words: Ti: Fe: LiNbO3 crystal, crystal pulling, transmission spectrum, diffraction efficiency, photorefraction

中图分类号: