KMgF_3∶Eu^(2+)晶体中Eu^(2+)的受激发射研究

Study on Stimulated Emission of Eu^(2+) in Crystal KMgF_3∶Eu^(2+)

二价铕离子(Eu2+)在KMgF3晶体中产生窄带线状发射,峰值位于360 nm。依据自身建立的激发态能量损耗模型,预测了4f7(6P7/2)→4f7(8S7/2)跃迁实现受激发射的可能性。采用ASE技术测得了KMgF3∶Eu2+晶体360 nm发射的光学增益,得到净光学增益系数g=(11.4±3.2)cm-1,实验证实了理论预测。晶体退火或掺杂敏化离子Gd3+或Ce3+可以改善Eu2+的增益效果。

The line emission peak of Eu^2＋ ion in crystal KMgF3 is at 360 nm. The probability of stimulated emission on 4f^7（^8P7/2）→4f^7 （^8S7/2） transition was predicted with a four-level decay model of Eu^2＋ ^6P7/2 excited states proposed by the authors. Optic gain and net gain coefficient （g=11.4±3. 2）cm^-1 of 360 nm emission in crystal KMgF3 ：Eu^2＋ were measured by ASE method, and the predication was proved by experiment. The net gain coefficient can be increased by annealing or doping crystal KMgF3 ： Eu^2＋ with Gd3^＋ or Ce^3＋.