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半导体激光器抽运耦合系统是固体激光器的重要组成部分。非成像系统空心透镜导管构成的耦合系统非常适用于大功率的半导体抽运阵列。为了给出透镜导管耦合系统的最佳结构,需要研究抽运光束在耦合系统内及输出面的分布。利用几何光学理论,在三维空间内,建立了空心透镜导管中抽运光束传播的数学模型,推导了光束传播的三维轨迹方程;在全三维光线追迹的理论分析基础上,开发了模拟透镜导管耦合系统传输光线的3D计算机仿真软件;通过该软件可以自动获得全部抽运光线在透镜导管耦合系统中的真实传输路径及在耦合系统输出端面的分布。最后探讨了抽运光束通过空心透镜导管耦合系统后的能量转换效率。计算结果表明,空心透镜导管的能量转换效率可以达到96.08%以上。
Semiconductor laser pumping coupling system is an important part of solid-state lasers. Non-imaging system Hollow lens catheter coupling system is ideal for high-power semiconductor pumping array. In order to give the best structure of the lens-tube coupling system, it is necessary to study the distribution of the pumping beam in the coupling system and the output surface. Based on the theory of geometrical optics, a mathematical model of pumping beam propagation in a hollow lens tube was established in three-dimensional space, and the three-dimensional trajectory equation of beam propagation was deduced. Based on the theoretical analysis of full three-dimensional ray tracing, a simulated lens catheter 3D computer simulation software that transmits light through the coupling system. The software can automatically obtain the real transmission path of all the pumping light in the lens catheter coupling system and the distribution at the output end of the coupling system. Finally, the energy conversion efficiency of the pump beam passing through the hollow lens catheter coupling system is discussed. The calculation results show that the energy conversion efficiency of the hollow lens catheter can reach more than 96.08%.