中文题目: SiO_2对Yb~(3+)离子在磷酸盐玻璃中扩大Stark分裂的作用
外文题目: Effect of SiO2 on the Stark splitting enlargement of Yb3+ in phosphate glass
作者: 王朋; 王超; 胡丽丽; 张丽艳
刊名: 物理学报
年: 2016 卷: 65 期: 5 文章编号：57801
中文关键词:
Stark分裂; 磷酸盐玻璃
英文关键词:
Yb3+-material; Stark splitting; phosphate glass
SOLID-STATE LASER; SATURABLE ABSORBER; TEMPERATURE
中文摘要:
基于传统磷酸盐玻璃组分, 通过引入SiO_2获得了改性的PS系列玻璃, 并研究了Yb~(3+)在PS系列玻璃中下能级Stark分裂及其光谱性质. 通过对该系列玻璃的吸收光谱、荧光光谱以及拉曼光谱的表征与分析确定了荧光光谱中最大波长处峰的属性. 结果表明: SiO_2的引入显著增大了Yb~(3+)下能级Stark分裂, 20 mol% SiO_2可将Stark分裂值从670 cm~(-1)提高到771 cm~(-1). 同时, 改进的磷酸盐玻璃光谱性能没有出现预期的降低现象, 反而得到了一定的改善. 实验证

英文摘要:
Up to now, high-energy large-scale Yb3+ laser has still faced to the fact that no proper gain media are available, though researchers made a more than ten year effort for it. Yb: fluorophosphate glass is the only material used in a laser system, reaching an output of more than 10 TW. As is well known, the thermal blocking of Yb3+ laser is a bottleneck in laser operation, which is closely related to the Stark splitting of Yb3+ in a gain medium. Conventional Yb: phosphate glass has the advantages in Yb3+ concentration, lifetime and cross section over silicate glass, however, its small Stark splitting is the main drawback that induces difficulties in realizing laser output at room temperature. Yb:phosphate glass will be a good gain medium for high power Yb3+ laser if the Stark splitting is improved. This study focuses on the enlargement of the Yb3+ Stark splitting in phosphate glass by introducing SiO2, thereby achieving a large Stark splitting property compared with the phosphate glass. The glass 60P(2)O(5)-7.5Al(2)O(3)-15K(2)O-17.5BaO-1Yb(2)O(3) is used as the base glass, and the modified glass denoted as PS is obtained by doping a certain amount of SiO2. Such a glass is prepared by the conventional melting-quenching method. Lorentz fitting is performed to the absorption and fluorescence spectra for determining the Stark splitting scheme. Raman spectrum is used for the auxiliary judgment of the attributions of the different spectroscopic bands. Then the results are confirmed by the barycenter law of Yb3+ ion. Investigations show that the addition of SiO2 can enlarge the Stark splitting obviously from the original 670 to 771 cm(-1) in PS3. Scalar crystal field parameter N-J and asymmetry degree around Yb3+ are also increased due to SiO2 incorporation. Meanwhile, spectroscopic properties of PS series glasses, such as fluorescence effective line width (Delta lambda(eff)) and fluorescence lifetime (tau(f)), are moderately enhanced. The glass transition temperature is improved greatly, which is very valuable for high power Yb3+ laser. These results suggest that the introduction of a second network former is an effective way to enlarge the Stark splitting of Yb3+ in phosphate glass. Next, our investigation will focus on preparing the high-homogeneity SiO2 modified phosphate glasses and the corresponding laser experiments.


文献类型: 期刊论文
正文语种: Chinese
收录类别: SCIEI
DOI: 10.7498/aps.65.057801


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