Impacts of laser pulse width and target thickness on laser micro-propulsion performance  

作　　者：Sibo WANG Bangdeng DU Baosheng DU Yongzan ZHENG Yanji HONG Jifei YE Baoyu XING Chenglin LI Yonghao ZHANG 王思博;杜邦登;杜宝盛;郑永赞;洪延姬;叶继飞;邢宝玉;李承霖;张永昊(State Key Laboratory of Laser Propulsion and Application,Space Engineering University,Beijing 101416,People's Republic of China;Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,People's Republic of China)

机构地区：[1]State Key Laboratory of Laser Propulsion and Application,Space Engineering University,Beijing 101416,People's Republic of China [2]Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,People's Republic of China

出　　处：《Plasma Science and Technology》2022年第10期113-126,共14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, 11602304 and 62175260)

摘　　要：In order to optimize the laser ablation performance of a micro-thruster with 1U dimensions,which employs a micro semiconductor laser,the impacts of pulse width and glycidyl azide polymer(GAP)thickness on thrust performance were researched.The results showed that with a GAP thickness of 200μm,the single-pulse impulse(I)increased gradually with the increase in the laser pulse width from 50 to 800μs,while the specific impulse(I_(sp)),impulse coupling coefficient(Cm)and ablation efficiency(η)all reached optimal values with a 200μs pulse width.It is worth noting that the optimal pulse width is identical to the ignition delay time.Both Cmandηpeaked with a pulse width of 200μs,reaching 242.22μN W^(-1)and 35.4%,respectively.With the increase in GAP thickness,I and Cmincreased gradually.GAP of different thicknesses corresponded to different optimal laser pulse widths.Under a certain laser pulse width,the optimal GAP thickness should be the most vertical thickness of the ablation pit,and the various propulsion performance parameters at this time were also optimal.With the current laser parameters,the optimal GAP thickness was approximately 150μm,I_(sp)was approximately 322.22 s,andηwas approximately 34.94%.

关 键 词：laser micro-propulsion pulse width target thickness specific impulse ablation efficiency 

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