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 analysis and experiment about a heat-capacity laser diode-pumped solid-state laser (HC-DPSSL) are discussed in this paper. In order to get uniform gain distribution and acquire well thermal distribution to reduce the stress of laser material, the coupling structural design of pump source is optimized through beam track process and the preliminary theoretical analysis of optical characters of laser medium is also described. Safe operation condition of laser is determined by numerical simulation of gradient of temperature and stress under different pump conditions. A primary experimental device of HC-DPSSL is produced in which a Nd:GGG disk with 15 millimeters thickness and 50 millimeters diameter is pumped by two laser diode arrays each constructed with 220 bars. A plane-plane resonant cavity is used in the device and a 30 mm×30 mm coupling beam spot has been obtained by collimation by micro-lens and using orthogonal set of cylinder lenses at the same time. The experiment result shows that the output power of 1385 W can be got in the device and the optical efficiency is above 17%.