不同参数条件下端面抽运Yb^(3+):KGd(WO_4)_2激光系统的优化

Optimization of an End-Pumped Yb^(3+)…KGd(WO_4)_2 Laser with Different Parametrical Conditions

Yb^(3+)…KGd(WO4)2激光器是近年来得到广泛关注的新型固体激光光源,具有吸收和发射截面大、荧光谱线宽、激光阈值低等突出特点。对此三能级激光系统进行微观动力学理论分析,在探讨了不同的晶体切割方向、抽运光偏振方向和激光偏振方向的吸收和发射特性的基础上研究了Yb^(3+)…KGd(WO_4)_2激光器输出特性随晶体长度和输出耦合镜反射率的变化规律,得到了Yb^(3+)…KGd(WO_4)_2激光器的最佳构成条件,即:晶体切割方向平行于g轴,抽运光偏振方向平行于m轴,激光偏振方向平行于p轴。

Yb3＋：KGd（WO4 ）2 laser is a new solid-state laser source which has been paid much attention in the recent years. It is characterized with the high absorption and emission cross-section, broad fluorescent linewidth and low laser threshold. The microcosmic kinetic of three energy-level laser system is theoretically analyzed. After investigating the absorptive and emission features with the different crystal cuttings, pump and laser polarization directions, the relationship between the output characteristics of a Yb3＋ ： KGd（WO4 ）2 laser and the crystal length as well as the reflectance of the output coupler is analyzed. Finally, the optimum conditions for a real Yb3＋ ： KGd （WO4）2 laser have been obtained as： crystal cut-direction parallel to g axis, pump polarization direction parallel to rn axis and laser polarization direction parallel to p axis.