为了对Yb∶YAG晶体荧光性能进行调控以使其更好地应用于高能脉冲型激光器, 结合密度泛函理论和晶体场理论, 对掺杂调控后的Yb∶YAG晶体的电子结构、光谱学性质进行了理论计算, 分析了不同粒子掺杂和占据格位情况下Yb∶YAG晶体的荧光性能, 并在此基础上计算配方完成晶体生长实验、制备样品进行荧光性能测试验证。结果表明, 通过以上过程掌握了Yb∶YAG晶体荧光寿命等参数的调控方法, 共掺Cr后的Yb∶YAG荧光寿命可以从1.18 ms降低至0.94 ms。该研究为Yb∶YAG晶体实现高能脉冲激光应用奠定了理论和实验基础。

In order to tune the fluorescence performance of Yb∶YAG crystal to be better applied in high-energy pulse lasers, based on density functional theory and crystal field theory, the electronic structure and spectroscopic properties of doped Yb∶YAG crystal were theoretically calculated. The fluorescence properties of Yb∶YAG crystal under the different types and occupation sites of particle doping were analyzed. According to the theoretical results, the crystal growth experiment was carried out, and the samples were prepared to verify the fluorescence performance. The results shows that, the tuning methods of Yb∶YAG crystal fluorescence lifetime and other parameters are mastered through the above process, that is, the fluorescence lifetime of Yb∶YAG co-doped with Cr decreases from 1.18 ms to 0.94 ms. This work lays a theoretical and experimental foundation for Yb∶YAG crystal to realize the application of high-energy pulsed laser.