400Hz高光束质量高功率短脉冲激光器

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.%A high energy,high beam quality short-pulse diode-pumped Nd:YAG master oscillator power-amplifier (MO-PA)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 com-pensation has improved the beam quality,a M2factor of 2.3 and an optical-to-optical efficiency of 27.7% are obtained at the max-imum laser out power.The laser has obtained 1.4 J output energy with polarization integration.