红外飞秒激光诱导Ce^3+掺杂闪烁晶体的上转换发光研究
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2007
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Resumo |
本文研究了红外飞秒激光照射下Ce^3+ 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Ce^3+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Ce^3+:YAP和Ce^3+: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,Ce^3+:YAP和Ce^3+:LSO晶体中的三光子吸收是三光子同时吸收. abstract {Ultraviolet and visible upconversion luminescence was demonstrated in trivalent cerium doped YAlO<sub>3</sub> crystal (Ce:YAP) and Lu<sub>2</sub>SiO<sub>5</sub> crystal (Ce<sup>3+</sup>:LSO) 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<sup>3+</sup> ion into upper 5 d level, which quickly nonradiatively relax to lowest 5 d level. Thereafter, the ions radiatively return to the ground states, leading to the characteristic emission of Ce<sup>3+</sup>.} |
Identificador | |
Idioma(s) |
中文 |
Fonte |
汪晨;杨旅云;董永军;徐军;陈丹平;邱建荣.红外飞秒激光诱导Ce^3+掺杂闪烁晶体的上转换发光研究,人工晶体学报,2007,36(3):526-530 |
Palavras-Chave | #光学材料;晶体 #超快激光 #闪烁晶体 #多光子过程 #上转换 |
Tipo |
期刊论文 |