Enhanced emission of 2.9μm from Ho3+/pr3+ co-doped LiYF4 crystal excited by 640nm

• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2013,（5）
• 页码范围: 362-366
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11801-013-3101-8

摘要

The use of Pr3+ co-doping for great enhancement of mid-infrared (mid-IR) emissions at 2.9 μm and 2.4 μm is investigated in the Ho3+/pr3+ co-doped LiYF4 crystals.With the introduction of Pr3+ ions,the fluorescence lifetime of Ho3+:5I7level is 2.15 ms for Ho3+/pr3+co-doped crystal,and the lifetime for Ho3+ singly doped crystal is 17.70 ms,while the lifetime of Ho3+:5I6 level decreases slightly from 2.11 ms for Ho3+:LiYF4 to 1.83 ms for Ho3+/pr3+:LiYF4.It is also demonstrated that the introduction of Pr3+ greatly increases the mid-infrared emission of Ho3+:5I6→5I7 which depopulates the Ho3+:5I7 level,while it has little influence on the Ho3+:5I6 level,which is beneficial for greater population inversion and laser operation.The analysis on the decay curves of the 2.0 μm emissions in the framework of the Inokuti-Hirayama model indicates that the energy transfer from Ho3+ to Pr3+ is mainly from electric dipole-dipole interaction.The calculated efficiency of energy transfer from Ho3+:5I7 to pr3+:3F2 level is 87.53％ for Ho3+/Pr3+ (1.02％/0.22％)co-doped sample.Our results suggest that the Ho3+/pr3+ co-doped LiYF4 single crystals may have potential applications in mid-IR lasers.