LDA侧面泵浦固体激光器泵浦结构参数优化

为LDA侧面泵浦Nd∶YAG棒状固体激光器的优化设计、参数选取及后续试验提供了理论依据和参考,建立了环形侧面泵浦棒状介质泵浦光场分布数值计算模型，研究了LDA侧面泵浦固体Nd∶YAG激光器泵浦光场的分布特点。模拟分析了LDA的bar间距、玻璃管厚度、激光晶体半径等几个主要泵浦结构参数对泵浦光场分布的影响。通过对不同泵浦参数下泵浦光分布特性的数值计算，优化了LDA侧面泵浦固体激光器的泵浦结构参数，优化后的仿真结果表明:在泵浦距离为2 mm条件下，晶体直径为4 mm，玻璃管套筒厚度为1 mm，冷却水层厚度为1 mm时，泵浦光在晶体中心处强度相对值为40.8%，在晶体轴心附近分布比较均匀，且均匀分布区域相对较大。

Optimization of pump structure parameters in LDA side-pumped solid state laser

The numerical model for pump light distribution of laser diode array( LDA) side-pumped laser rod was set up, the characteristics of pump light distribution in crystal of Nd∶YAG were analyzed in detail based on that model.The analysis results could be theoretical guidance for optimization in LDA side-pumped solid state laser designing, optimization and experiment. Several parameters which may influence the pump light distribution were discussed, such as the distance between bars, the thickness of glass tube and the radius of laser rod. Based on these numerical analyses, the pump parameters of LDA side pumped solid state laser were optimized.The optimized analyzing results show that while the rod diameter is 4 mm,the bar distance is 0.4 mm,the glass tube thickness is 1 mm and the water thickness is 1 mm under the circumstance of 2 mm pump distance, we could obtain that the relative pump intensity in the center of the crystal is 40.8%,and the distribution near the axis of crystal is a relatively large homogeneous area.