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40mJ、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712.5mJ、脉宽12.4ns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1.4J。
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 M^2=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 M^2 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 Joutput energy with polarization integration.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2018年第4期4-7,共4页
High Power Laser and Particle Beams
关键词
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
