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开展了热容激光二极管(LD)抽运固体激光器理论和实验研究工作,进行了抽运源耦合结构的光线追迹和优化设计,针对热容工作模式下激光介质的激光特性进行了初步理论分析,数值模拟了不同抽运条件下激光介质的增益分布及温度梯度、应力梯度,确定了激光器的安全运行条件。初步完成了热容激光器实验平台的建立:采用两个220 Bar的激光二极管面阵对直径为50 mm,厚度为15 mm的Nd∶GGG晶体进行抽运,耦合方式为微透镜准直加正交柱透镜组,耦合光斑的大小为30 mm×30 mm,谐振腔采用平平腔,实验结果表明该激光器在平均抽运功率为8100 W的激励条件下获得了1385 W的激光输出,光-光转换效率约为17%。
The theoretical and experimental research on the heat pump laser diode laser (LD) was carried out. The light tracing and optimization design of the pumping source coupling structure were carried out. The laser theoretical analysis of the laser medium under the heat capacity mode was carried out. The gain distribution, temperature gradient and stress gradient of the laser medium under different pumping conditions were numerically simulated, and the safe operating conditions of the laser were determined. The experiment of heat capacity laser was completed. Two Nd: GGG crystals with a diameter of 50 mm and a thickness of 15 mm were pumped by two 220 Bar laser diode arrays. The coupling modes were microlens collimation and orthogonal Cylindrical lens group, the size of the coupling spot is 30 mm × 30 mm, and the cavity is flat. The experimental results show that the laser achieves a laser output of 1385 W under the excitation with an average pumping power of 8100 W. The light- The efficiency is about 17%.