单级静态高峰值功率灯抽运脉冲Nd：YAG固体激光器

High Peak Power Lamp-Pumped Pulsed Nd∶YAG Solid-State Laser with One Cavity

报道了采用对称平面平行腔结构实现单级静态输出30kW高峰值功率灯抽运Nd：YAG固体激光器的研究结果。从速率方程出发．推导出脉冲Nd：YAG固体激光器的单脉冲能量表达式，模拟出输出镜最佳透过率及最大输出能量。通过实验选取激光器工作的最佳参数，研制出一台高峰值功率灯抽运脉冲Nd：YAG激光器，理论模拟和最佳实验结果基本一致。激光器在最大输入电压为800V，脉宽为2ms时，输出最大单脉冲能量60J，最大峰值功率30kW．光束质量Me为5．9，总体电光转换效率3．3％。在最大输入电压为800V，脉宽为1．5ms时最大平均功率405W。采用该激光器切割6mm低碳钢和4mm不锈钢，在脉宽为2ms，频率为6Hz，峰值功率为30kW时，切割4mm不锈钢速度为1mm／s．切割6mm低碳钢速度为1．5～2mm／s。

The experiment results of high peak power lamp-pumped pulsed Nd： YAG laser adopting symmetrical parallel plane cavity are reported. Base on the rate equation, the expression of single pulse energy of pulsed Nd： YAG solid-state laser is derived with the simulated optimum transmissivity and maximum output energy. The optimal parameters are obtained by the experiments, and a high peak power lamp-pumped pulsed Nd：YAG laser is developed with the results of theory simulating and optimal experiments being consistent with each other. When the laser works under 800 V voltage, 2 ms pulse width, it outputs laser with energy of 60 J, high peak power of 30 kW with beam quality Me = 5.9, and the total electro-optic efficiency of 3.3%. When it works under 800 V voltage, 1.5 ms pulse width, the maximum output average power is 405 W. The 6 mm mild steel and 4 mm stainless steel were cut by the laser with the 2 ms pulse width, 6 Hz frequency and 30 kW peak power. The cutting speed for 4 mm stainless and 6 mm mild steel is 1 mm/s and 1. 542 mm/s, respectively.