中国激光, 2019, 46 (7): 0701005, 网络出版: 2019-07-11
10 kHz,425.6 mJ声光调Q Nd∶YAG激光器 下载: 1233次
Acousto-Optic Q -Switch Nd∶YAG Laser with 10-kHz Repetition Rate and 425.6 mJ Pulse Energy
摘要
报道了一种高重复频率、大单脉冲能量的全固态声光调Q Nd∶YAG激光器。采用主振荡-功率放大(MOPA)结构,将具有热补偿结构的双棒串接谐振腔作为种子源, 两个板条增益模块作为放大器。采用熔石英为声光介质,重复频率在10~100 kHz范围内可调。种子源在10 kHz重复频率下获得平均功率为14 W的线偏振脉冲激光输出,种子光经扩束整形后注入两级板条增益模块进行功率放大。当抽运功率为22.7 kW时,可获得平均功率为4256 W的激光输出,单脉冲能量为425.6 mJ,激光脉宽为133 ns,峰值功率为3.2 MW,光束质量β 为3.8倍衍射极限。此外,改变激光的重复频率时,激光输出功率和脉宽无明显变化。
Abstract
This study demonstrates an all-solid-state acousto-optic Q-switch Nd∶YAG laser with a high repetition rate and high pulse energy. A master oscillator power amplifier system with a thermal-compensation cavity of connecting two Nd∶YAG rods in series and an amplifier containing a two-slab gain medium is selected for the experiment. Fused silica is used as the acousto-optic Q-switch crystal with an adjustable repetition rate of 10-100 kHz. At the repetition rate of 10 kHz, the linearly polarized laser with an output power of 14 W is injected into the two-slab gain medium for amplification after beam expanding and sharping. When the pump power is 22.7 kW, a laser output power of 4256 W is obtained with a pulse energy, pulse width, and peak power of 425.6 mJ, 133 ns, and 3.2 MW, respectively. The laser beam quality β is 3.8 times of the diffraction limit. The output power and pulse width at different repetition rates are kept constant during the experiment.
陈月健, 庞毓, 周唐建, 尚建力, 王君涛, 李密, 高清松, 王亚楠. 10 kHz,425.6 mJ声光调