High beam quality and high power short-pulse laser with 400 Hz
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摘要: 研制了大能量高光束质量短脉冲激光器，系统采用主振荡+预放大器+主放大器2级主振荡功率放大器(MOPA)结构。采用双棒热效应补偿改善光束质量的措施，在重复频率400 Hz时实现单脉冲能量40 mJ、光束质量因子约为1.2的激光输出。激光器放大后实现单路脉冲能量712.5 mJ、脉宽12.4 ns的激光输出，采用球差补偿的方法提高了激光器的光束质量，在最大输出功率下实现了光束质量因子小于2.3，光光效率27.7%。偏振合束后，激光器输出能量大于1.4 J。Abstract: A high energy, high beam quality short-pulse diode-pumped Nd: YAG master oscillator power-amplifier (MOPA) laser with two amplifier stages is demonstrated. The two-rod birefringence compensation is used as beam quality control measure, which presents a short-pulse energy of 40 mJ with a beam quality value of M2=1.2 at a repetition rate of 400 Hz. The MOPA system delivers a short-pulse energy of 712.5 mJ with a pulse width of 12.4 ns.The method of spherical aberration compensation has improved the beam quality, a M2 factor of 2.3 and an optical-to-optical efficiency of 27.7% are obtained at the maximum laser out power. The laser has obtained 1.4 J output energy with polarization integration.
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图 2 实际测量的圈直径10 mm Nd: YAG棒截面荧光分布图
Figure 2. Measured fluorescence distribution on cross section of ϕ10 mm Nd: YAG rod
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