Sc掺杂Nd:CaF_2激光晶体的结构及其光谱性能参数

Structure and Spectral Property of Sc Doped Nd:CaF_2 Laser Crystals

采用温度梯度法生长了0.5at%Nd、xat%Sc:CaF_2(x=0,2,5,8)系列晶体,测试了晶体的吸收光谱、荧光光谱和荧光寿命。研究发现发射强度和荧光寿命随着Sc^(3+)离子浓度的增加而提高。通过改变Sc^(3+)离子的浓度发现,当掺杂5at%Sc^(3+)时可以获得最大的吸收截面为1.42×10^(–20) cm^2。另外,掺入Sc^(3+)使共掺晶体在吸收光谱796 nm处产生新峰。综上,通过调节Sc^(3+)离子浓度,可以改变Nd^(3+)离子的局域结构,优化晶体的光谱性能。

0.5 at% Nd, xat% Sc：CaF2 single crystals（x=0, 2, 5, 8） were fabricated via the temperature gradient technique in this work. The absorption spectra, fluorescence spectra and fluorescence lifetime of 0.5 at% Nd, xat% Sc：CaF2 single crystals were investigated. Both fluorescence intensity and fluorescence lifetime were found to be enhanced with the increase of Sc^（3＋） ion doping concentration. In addition, by optimizing the Sc^（3＋） content, 0.5 at% Nd, 5 at% Sc：CaF2 yielded the largest absorption cross section of 1.42′10^（–20） cm^2. Moreover, a new peak were observed at 796 nm with the Sc^（3＋） ion doped in 0.5 at% Nd：CaF2 crystals. Above all, the concentration of Sc^（3＋） ion can regulate local structure of Nd^（3＋） ion and optimize its crystalline spectral properties.