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微柱阵列和透镜导管组成的耦合系统在激光二极管阵列(LDA)抽运的全固态高能量激光器中起着重要的作用,其光束耦合性能直接影响激光器的最终输出能量和光束质量。为了设计微柱阵列和透镜导管耦合系统的最佳结构参数,需要研究抽运光在耦合系统内部以及在激光晶体端面的分布。利用几何光学理论,对LDA的发射光线经微柱阵列和透镜导管的传输进行三维空间追迹,并计算其能量传输效率和光束整形效果。比较了六面体导管和渐细圆台形导管的耦合性能。仿真分析结果表明,六面体导管需要长度较大,能量传输效率略高,而圆台形导管可以较短,耦合整形后的光斑更接近圆形。
The coupling system consisting of a microcolumn array and a lens tube plays an important role in all-solid-state high-energy lasers driven by a laser diode array (LDA), and the beam coupling performance directly affects the laser’s final output energy and beam quality. In order to design the optimum structural parameters of the microcolumn array and the lens catheter coupling system, it is necessary to study the distribution of the pump light inside the coupling system and at the end face of the laser crystal. Using the theory of geometrical optics, the emission of LDA was traced through the micro-column array and the lens tube in three-dimensional space, and the energy transfer efficiency and the beam shaping effect were calculated. The coupling performance of hexahedron and tapered truncated cone catheter was compared. The simulation results show that the length of the hexahedron catheter is larger and the energy transmission efficiency is slightly higher. However, the truncated cone catheter can be shorter and the coupled light spot can be closer to the circular shape.