中国激光, 2009, 36 (1): 51, 网络出版: 2009-02-10   

高效大功率激光二极管阵列端面抽运耦合系统

High Power Laser Diode Arrays End-Pumped Efficient Coupling System
作者单位
中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
摘要
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。
Abstract
In order to study the efficient coupling system and its stimulation method for the end-pumped structure of high power laser diode (LD) arrays, a hollow duct coupling system for 12 kW LD pumped Yb∶YAG laser was designed by ray tracing method. Based on the LD bar’s structure and beam parameters, the source models about LD bar and array were simulated by arranging emitters with Gaussian beam. In the coupling system, two lenses and silver-coated flat reflectors were used to concentrate pumping radiations. The experimental results have confirmed that the coupling system achieve a high efficiency and the energy distribution is agreed well with the theoretical analysis. The coupling efficiency of the system is 92.3% on the condition of 94% reflectivity of reflectors. The coupling beam shows excellent propagation characteristics and large uniform pump field on the surface of gain medium which meet the requirement of the Yb∶YAG laser very well.

段文涛, 蒋东镔, 蒋学君, 蒋新颖, 徐美健, 於海武. 高效大功率激光二极管阵列端面抽运耦合系统[J]. 中国激光, 2009, 36(1): 51. Duan Wentao, Jiang Dongbin, Jiang Xuejun, Jiang Xinying, Xu Meijian, Yu Haiwu. High Power Laser Diode Arrays End-Pumped Efficient Coupling System[J]. Chinese Journal of Lasers, 2009, 36(1): 51.

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