Micro-impulse and plasma plume produced by irradiating aluminum target with nanosecond laser pulses in double-pulse scheme  

作　　者：Chenghao YU Jifei YE Weijing ZHOU Hao CHANG Wei GUO 于程浩;叶继飞;周伟静;常浩;郭威(State Key Laboratory of Laser Propulsion&Application,Department of Aerospace and Technology,Space Engineering University,Beijing 101416,People's Republic of China)

机构地区：[1]State Key Laboratory of Laser Propulsion&Application,Department of Aerospace and Technology,Space Engineering University,Beijing 101416,People's Republic of China

出　　处：《Plasma Science and Technology》2022年第7期82-89,共8页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.11502301 and 11602304)。

摘　　要：The micro-impulse generated by ablating an aluminum target in double-pulse laser bursts with different interpulse delays was investigated using a torsion pendulum.The plasma plume was simultaneously visualized using high-speed photography to analyze the coupling mechanism of the ablation impulse.The experiment was carried out using a pulsed laser with a pulse width of 8 ns and a wavelength of 1064 nm.The experimental results show that an impulse with an interpulse delay of 60 ns is roughly 60%higher than that with no delay between the two pulses,when the energy of both laser pulses is 50 m J.Therefore,double-pulse schemes could enhance the ablation impulse under certain conditions.This is because the ablation of the first laser pulse changes the optical properties of the aluminum target surface,increasing the absorptivity.However,the ablation impulse is reduced with a time delay of 20 ns when the energy of both laser pulses is100 mJ or 150 mJ.It can be concluded that the plasma produced by ablating the aluminum with the first pulse shields the second laser pulse.To summarize,the experimental results show that different delay times in a double-pulse scheme have a significant effect on the ablation impulse.The study provides a reference for the optimization of the parameters when laser ablation propulsion with a double-pulse scheme is applied in the fields of space debris removal,laser ablation thrusters,and so on.

关 键 词：laser ablation double pulse scheme impulse enhancement aluminum plasma plume fast photography 

分 类 号：V439.2[航空宇航科学与技术—航空宇航推进理论与工程] TN249[电子电信—物理电子学]