%0 Journal Article
%T SYUDY ON THE MICRO-MECHANISM OF MG-DOPED LITUIUM NIOBATE CRYSTALS AGAINST PHOTOREFRACTION<br>掺镁铌酸锂晶体抗光折变微观机理研究
%A KONG Yong-Fa
%A LI Bing
%A CHEN Yun-lin
%A HUANG Zi-Heng
%A CHEN Shao-Lin
%A ZHANG Ling
%A LIU Shi-Guo
%A XU Jing-Jun
%A <br>孔勇发
%A 阎文博
%J 红外与毫米波学报
%D 2003
%I Science Press
%X The ultraviolet-visible and infrared absorption spectra of Fe 2O 3 and MgO co-doped lithium niobate (LiNbO 3) crystals were studied. It was found that some Fe 2+ ions were still in Li-sites though Fe 3+ ions changed their site occupation from Li-sites to Nb-sites while the doping concentration of MgO was above the threshold (the first threshold). Defect chemical analysis shows that the amount of Fe 2+ ions will decrease as the doping concentration of Mg increases, and when the doping concentration reaches a suitable value (the second threshold) all Fe 2+ ions in Li-sites will diminish. It is expected that LiNbO 3 crystal doped with the second threshold will have an excellent ability to resist laser induced optical damage. This phenomenon is called as double thresholds effect.
%K Mg doped lithium niobate crystal
%K anti-photorefraction
%K micro-mechanism
%K absorption spectra<br>掺镁
%K 铌酸锂晶体
%K 抗光折变
%K 微观机理
%K 吸收光谱
%K 双阈值效应
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=D3B4F771D1A06062008B4D0A2EF05996&aid=98B17577CF7CA9B3&yid=D43C4A19B2EE3C0A&vid=BC12EA701C895178&iid=CA4FD0336C81A37A&sid=1371F55DA51B6E64&eid=1AE5323881A5ECDC&journal_id=1001-9014&journal_name=红外与毫米波学报&referenced_num=3&reference_num=15