强激光与粒子束, 2018, 30 (4): 041001, 网络出版: 2018-05-04
400 Hz高光束质量高功率短脉冲激光器
High beam quality and high power short-pulse laser with 400 Hz
球差补偿 主振荡功率放大器 高光束质量 大能量 spherical aberration compensation master oscillator power-amplifier high beam quality high energy
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.
靳全伟, 庞毓, 蒋建锋, 谭亮, 崔玲玲, 魏彬, 孙殷宏, 唐淳. 400 Hz高光束质量高功率短脉冲激光器[J]. 强激光与粒子束, 2018, 30(4): 041001. Jin Quanwei, Pang Yu, Jiang Jianfeng, Tan Liang, Cui Lingling, Wei Bin, Sun Yinhong, Tang Chun. High beam quality and high power short-pulse laser with 400 Hz[J]. High Power Laser and Particle Beams, 2018, 30(4): 041001.