Yb离子抽运动力学及脉冲储能特性研究

从准三能级Yb离子的能级结构出发，建立了Yb离子的抽运和激光速率方程，结合解析和数值方法，研究了Yb激光介质的抽运动力学过程，包括抽运激发效率、最低抽运强度、激光能量提取效率等关键参数.比较了三类典型的Yb激光介质性能：Yb:S-FAP,Yb:YAG以及Yb:FP-glass.以放大自发辐射(ASE)为设计判据，重点研究了脉冲储能型Yb激光器的设计准则，包括增益介质的厚度与掺杂浓度.最后利用此模型给出了基于Yb:S-FAP以及Yb:YAG的100J级二极管抽运固体激光器(DPSSL)的总体设计参数.将对基于Yb激光介质的脉冲储能型DPSSL的设计提供有益的参考. 关键词： Yb离子 速率方程 抽运动力学 二极管抽运固体激光器

Investigation on pumping dynamics and pulsed energy storage performance of Yb ions

Based on the energy structure of quasi-three-level Yb-ion, the pumping and lasing rate equations are set up. The pumping dynamics of Yb-ion is investigated analytically and numerically, which includes the pumping excitation efficiency, the minimum pumping intensity, and the stored energy extraction efficiency. The laser performances of three typical Yb-doped laser materials are compared, i.e., Yb:S-FAP, Yb:YAG and Yb:FP-glass. Based on the criterion of amplified spontaneous emission (ASE), the design principles of pulsed energy-storage Yb lasers are investigated specifically, which includes the optimum thickness and doping concentration of the gain medium. Finally, based on our model, the baseline parameters are presented for a 100J-class diode-pumped solid-state laser based on either Yb:S-FAP or Yb:YAG. This paper would be helpful for designing the pulsed energy-storage Yb-based DPSS lasers.