Energy-transfer processes in Yb:Tm-doped KY3F10, LiYF4, and BaY2F8 single crystals for laser operation at 1.5 and 2.3 μm
Energy-transfer processes in Yb:Tm-doped KY3F10, LiYF4, and BaY2F8 single crystals for laser operation at 1.5 and 2.3 μm
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DOI：
10.1103/physrevb.61.5280
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发表时间：
2000-02-15
影响因子：
3.7
通讯作者：
Tkachuk, AM
中科院分区：
文献类型：
--
作者：
Braud, A;Girard, S;Tkachuk, AM
本文定量研究了不同Tm：Yb掺杂氟化物晶体中的能量传递过程。已经检查的三种基质晶体（KY 3F 10、LiYF 4和BaY 2F 8）之间的比较清楚地表明，在KY 3F 10中Yb->Tm能量转移的效率大于在LiYF 4或BaY 2F 8中。的能量转移参数的依赖性上的共掺杂剂的浓度已被实验测量，并与迁移辅助的能量转移模型的基础上计算的结果进行比较。利用这些能量转移参数和速率方程模型，我们对Tm离子H-3（4）-->F-3（4）和H-3（4）-->H-3（5）激光跃迁的阈值分别进行了理论计算。激光实验在1.5 μ m Yb：Tm：LiYF 4，然后导致激光阈值与理论推导的很好的协议。基于这些结果，Yb和Tm掺杂剂浓度的典型值的激光腔和泵模式的优化值，最后得出最小化的阈值泵浦功率约1.5和2.3 μ m的激光跃迁。
Energy-transfer processes have been quantitatively studied in various Tm:Yb-doped fluoride crystals. A comparison between the three host crystals which have been examined (KY3F10, LiYF4, and BaY2F8) shows clearly that the efficiency of the Yb-->Tm energy transfers is larger in KY3F10 than in LiYF4 or BaY2F8. The dependence of the energy-transfer parameters upon the codopant concentrations has been experimentally measured and compared with the results calculated on the basis of migration-assisted energy-transfer models. Using these energy-transfer parameters and a rate equation model, we have performed a theoretical calculation of the laser thresholds for the H-3(4)-->F-3(4) and H-3(4)-->H-3(5) laser transitions of the Tm ion around 1.5 and 2.3 mu m, respectively. Laser experiments performed at 1.5 mu m in Yb:Tm:LiYF4 then led to laser threshold values in good agreement with those derived theoretically. Based on these results, optimized values for the Yb and Tm dopant concentrations for typical values of laser cavity and pump modes were finally derived to minimize the threshold pump powers for the laser transitions around 1.5 and 2.3 mu m.