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利用光线追迹法为12 kW激光二极管(LD)阵列抽运的Yb∶YAG激光器设计了一套空心导管型耦合系统并开展了耦合实验,以研究大功率LD阵列端面抽运结构的高效耦合技术及模拟设计方法。基于LD结构和发光特性,以高斯型微激射元为基本单位建立单条LD和LD阵列光源模型,设计了由透镜和镀银板构成的抽运光汇聚传输系统。实验结果表明,该耦合系统实现了对抽运光的高效耦合,且强度分布与模拟结果一致。该耦合系统传输损耗低,反射板的反射率为94%时耦合效率达92.3%;输出光束具有良好的传输性能,有效抽运区域接近理论值,且增益介质表面分布均匀,满足实验要求。
A hollow catheter-type coupling system and a coupling experiment were designed for the Yb: YAG laser with a 12 kW laser diode (LD) array by ray tracing method. The coupling experiment was carried out to study the efficient coupling technology of the end-pumped structure of high power LD array And simulation design method. Based on the LD structure and the luminescence properties, a single LD and LD array light source model was established based on the Gaussian-type microphotoelement. The pumping light convergence transmission system was designed with lens and silver-plated plate. Experimental results show that the coupled system achieves efficient coupling of pumping light, and the intensity distribution is consistent with the simulation results. The coupling system has a low transmission loss and a coupling efficiency of 92.3% when the reflectance of the reflector is 94%. The output beam has good transmission performance, the effective pumping area is close to the theoretical value, and the surface of the gain medium is evenly distributed to meet the experimental requirements.