高功率LD侧面单向泵浦激光模块的理论研究

Theoretical Study of High Power LD Unidirectional Side-Pumped Laser Module

构建了一种激光二极管(LD)侧面单向泵浦激光模块的理论模型。综合光线追迹和有限元仿真方法,推导了该模型下泵浦效率及晶体内光场分布均匀性的计算公式,数值分析了LD切向位移量、径向角度偏离度及晶体吸收系数等因素对泵浦效率和光场分布均匀性的影响。研究结果表明:随着吸收系数的增加,光场分布的均匀性呈现逐渐下降趋势;通过优化LD切向位移量和径向角度偏离量,仿真获得了高达93%的泵浦效率。研究成果对高功率LD侧面单向泵浦激光模块的优化设计和实验研究具有一定的参考价值。

In this paper,a theoretical model on LD unidirectional side-pumped laser module has been constructed.Combining ray tracing and finite element simulation method,these calculation formulae on pump efficiency and distribution uniformity of light field in the crystal were derived.The effects of LD tangential displacement,radial angle deviation and crystal absorption coefficient on the pump efficiency and the uniform distribution of pump light in the crystal were also numerically analyzed.The results show that,with the increase of absorption coefficient,the distribution uniformity of light field in the crystal will decrease gradually.Maximum pump efficiency up to 93%can be achieved by optimizing the deviation of LD displacement and radial angle.The research results have certain reference value for optimization design and experimental study of the high power LD unidirectional side-pumped laser module.