红外飞秒激光诱导Ce^(3+)掺杂闪烁晶体的上转换发光研究  

Upconversion Luminescence of Ce^(3+) Doped Scintillator Crystals by Femtosecond Laser Irradiation

作　　者：汪晨[1] 杨旅云[1] 董永军[1] 徐军[1] 陈丹平[1] 邱建荣[2] 

机构地区：[1]中国科学院上海光学精密机械研究所 [2]浙江大学材料科学与工程学院,杭州310027

出　　处：《人工晶体学报》2007年第3期526-530,共5页Journal of Synthetic Crystals

基　　金：国家973(NO.2006CB806000b)资助项目

摘　　要：本文研究了红外飞秒激光照射下Ce3+掺杂的YAP和LSO两种闪烁晶体的上转换发光现象。实验发现在飞秒激光泵浦下,这两种晶体的荧光均来自于Ce3+离子的5d-4f跃迁。荧光强度与泵浦光功率之间的依赖关系揭示了Ce3+:YAP和Ce3+:LSO晶体的上转换过程皆由三光子吸收过程所主导。分析表明,Ce3+:YAP和Ce3+:LSO晶体中的三光子吸收是三光子同时吸收。Ultraviolet and visible upconversion luminescence was demonstrated in trivalent cerium doped YAlO3 crystal （Ce^3＋ -YAP） and Lu2SiO5 crystal （Ce^3＋ ：L SO） under focused infrared femtosecond laser irradiation. The fluorescence spectra show that the upconverted luminescences come from the 5d-4f transitions of the electrons in trivalent cerium ions. The dependence of luminescence intensity of trivalent cerium on infrared pumping power reveals that the conversions of infrared radiation are dominated by three-photon excitation process. It is suggested that the simultaneous absorption of three infrared photons pumps the Ce^3＋ ion into upper 5d level, which quickly nonradiatively relax to lowest 5d level. Thereafter, the ions radiatively return to the ground states,leading to the characteristic emission of Ce^3＋.

关 键 词：超快激光 闪烁晶体 多光子过程 上转换 

分 类 号：O734[理学—晶体学]