分析化学(期刊)
杂质
Crystal(编程语言)
光谱学
猝灭(荧光)
拉曼光谱
发射光谱
离子
吸收光谱法
材料科学
兴奋剂
激光器
化学
谱线
荧光
光学
天文
程序设计语言
有机化学
物理
量子力学
光电子学
色谱法
计算机科学
作者
Masahiko Ito,C. Goutaudier,Y. Guyot,Kheirréddine Lebbou,Tsuguo Fukuda,G. Boulon
标识
DOI:10.1088/0953-8984/16/8/029
摘要
Ca1−XYbXF2+X crystals were grown by two different methods: simple melting under CF4 atmosphere and the laser heated pedestal growth (LHPG) method under Ar atmosphere. Spectroscopic characterization (absorption, emission, Raman spectroscopy and decay curves) was carried out to identify Stark levels of Yb3+ transitions in the different crystallographic sites of the cubic structure in Ca1−XYbXF2+X crystals. The Yb3+ concentration dependence of the experimental decay time was analysed by using concentration gradient fibre in order to understand involved concentration quenching mechanisms. Under Yb3+ ion infrared pumping, self-trapping and up-conversion non-radiative energy transfer to unexpected rare earth impurities (Er3+, Tm3+) has been observed in the visible region and interpreted by a limited diffusion process within the Yb3+ doping ion subsystem towards impurities. The main parameters useful for a theoretical approach of laser potentiality have been given as τrad = 2.05 ms, N0 = 7.47 × 1021 cm−3 (32 mol%) and Nm = 6.39 × 1021 cm−3 (26.5 mol%).
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