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宽带高增益钕玻璃放大器在惯性约束聚变(ICF)激光驱动器研究中具有重要意义。对影响激光二极管阵列(LDA)抽运钕玻璃棒状放大器增益的各因素进行分析,确立了放大器的优化参量。建立了模拟环形LDA侧面抽运钕玻璃棒状放大器功率沉积过程的光线追迹模型,并开发相关程序。在模拟计算基础上,分别优化了LDA直接耦合抽运和LDA准直耦合抽运这两种构型的放大器参数。最后引入了指向误差分析,比较了这两种耦合方式的优劣,最终将放大器定为直接耦合抽运方式。按照优化后的结构加工了8.1 kW激光二极管抽运的φ2 mm钕玻璃放大器,放大器的荧光分布均匀,当抽运功率为7.7 kW时,得到了40倍的小信号增益,且放大器后增加偏振片时所测增益稳定性较好。
Broad band high gain neodymium glass amplifiers are of great importance in the research of inertial confinement fusion (ICF) laser drivers. The factors that affect the gain of laser diode array (LDA) pumping neodymium glass rod amplifier are analyzed, and the optimal parameters of the amplifier are established. A ray tracing model was established to simulate the power deposition process of the side-looped neodymium glass rod amplifier of a circular LDA, and the related procedure was developed. Based on the simulation calculation, the amplifier parameters of LDA direct coupled pumping and LDA collimating coupled pumping are respectively optimized. Finally, the error analysis is introduced, the advantages and disadvantages of these two coupling modes are compared, and finally the amplifier is set as the direct coupling pumping mode. According to the optimized structure, a Φ2 mm neodymium glass amplifier with 8.1 kW laser diode pump was fabricated. The fluorescence of the amplifier was evenly distributed. When the pump power was 7.7 kW, 40 times of small signal gain was obtained. After the amplifier, a polarizer The measured gain stability is better.