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报道了采用对称平面平行腔结构实现单级静态输出30 kW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800 V,脉宽为2 ms时,输出最大单脉冲能量60 J,最大峰值功率30 kW,光束质量M2为5.9,总体电光转换效率3.3%。在最大输入电压为800 V,脉宽为1.5 ms时最大平均功率405 W。采用该激光器切割6 mm低碳钢和4 mm不锈钢,在脉宽为2 ms,频率为6 Hz,峰值功率为30 kW时,切割4 mm不锈钢速度为1 mm/s,切割6 mm低碳钢速度为1.5~2 mm/s。
The results of a single stage static output pumping of Nd:YAG solid state laser with 30 kW peak power at a symmetrical planar parallel cavity are reported. Based on the rate equation, the single-pulse energy expression of pulsed Nd: YAG solid-state laser is deduced and the best transmittance and maximum output power of the output mirror are simulated. By experimenting the optimum parameters of the laser, a high power pulse Nd:YAG laser with high peak power was developed. The theoretical simulation and the best experimental results are basically the same. When the maximum input voltage is 800 V and the pulse width is 2 ms, the laser outputs the maximum single-pulse energy of 60 J and the maximum peak power of 30 kW. The beam quality M2 is 5.9 and the overall electro-optical conversion efficiency is 3.3%. The maximum average power is 405 W at a maximum input voltage of 800 V and a pulse width of 1.5 ms. The laser was used to cut 6 mm mild steel and 4 mm stainless steel. The 4 mm stainless steel was cut at 1 mm / s at a pulse width of 2 ms, a frequency of 6 Hz and a peak power of 30 kW, and a 6 mm low carbon steel Speed of 1.5 ~ 2 mm / s.