红外与毫米波学报, 2003, 22 (1): 40, 网络出版: 2006-05-10
掺镁铌酸锂晶体抗光折变微观机理研究
SYUDY ON THE MICRO-MECHANISM OF MG-DOPED LITUIUM NIOBATE CRYSTALS AGAINST PHOTOREFRACTION
掺镁铌酸锂晶体 抗光折变 微观机理 吸收光谱. Mg doped lithium niobate crystal anti-photorefraction micro-mechanism absorption spectra.
摘要
研究了掺镁掺铁铌酸锂晶体的紫外、可见及红外光谱,首次发现当掺镁量超过通常所说的阈值(第一阀值)时,Fe3+离子和部分Fe2+离子的晶格占位由锂位变为铌位,但仍有部分Fe2+离子留在锂位. 晶体缺陷化学分析表明,继续增加掺镁量,占锂位的Fe2+离子数将逐渐减少;当掺镁量达到另一个适当的值(第二阀值)时,全部Fe2+都占铌位,晶体的抗光折变能力空前提高,这种现象称作双阈值效应.
Abstract
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.
孔勇发, 李兵, 陈云琳, 黄自恒, 陈绍林, 张玲, 刘士国, 许京军, 阎文博, 刘宏德, 王岩, 谢翔, 张万林, 张光寅. 掺镁铌酸锂晶体抗光折变微观机理研究[J]. 红外与毫米波学报, 2003, 22(1): 40. 孔勇发, 李兵, 陈云琳, 黄自恒, 陈绍林, 张玲, 刘士国, 许京军, 阎文博, 刘宏德, 王岩, 谢翔, 张万林, 张光寅. SYUDY ON THE MICRO-MECHANISM OF MG-DOPED LITUIUM NIOBATE CRYSTALS AGAINST PHOTOREFRACTION[J]. Journal of Infrared and Millimeter Waves, 2003, 22(1): 40.
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