摘要
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。
Nd^3＋ -doped phosphate glass amplifier with high gain and broad band is important in inertial confinement fusion （ICF） laser driver research. After analyzing all the factors which determine gain of a laser diode array （LDA） pumped Nd glass rod amplifier, the optimum parameters are presented. The ray-tracing model is set up to simulate the deposition process of LDA side-pumped Nd glass rod amplifier, and the relative program is developed. Based on the simulation, the structures of amplifiers without and with micro-lens are optimized. From the error analysis of LDA pointing, it is found out that the amplifier without micro-lens is more preferable. A rod amplifier with Ф2 mm Nd glass and 8.1 kW pumping power is manufactured. The fluorescence distribution of the amplifier is uniform. As pumping power is 7.7 kW, the amplifier gain is 40. When a polarizer is added behind the amplifier, gain of the amplifier is very stable.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2009年第1期70-76,共7页
Chinese Journal of Lasers
