Characteristics of the Plasma Plume and Micro-Impulse Generated by
Irradiating the Aluminum Target With a Nanosecond Laser Pulse at
Oblique Incidence
YU Cheng-hao, YE Ji-fei*, ZHOU Wei-jing, CHANG Hao*, GUO Wei
State Key Laboratory of Laser Propulsion & Application, Department of Astronautical Science and Technology, Space Engineering University, Beijing 101416, China
Abstract：To study the impulse coupling mechanism of a pulsed laser ablation aluminum target, the direct measurement of its macroscopic impulse coupling characteristics is one of the means. However, laser ablation involves many physical processes. Therefore, analysing the impulse formation mechanism only by studying its macroscopic mechanical properties is difficult. Plasma plume ejection formed by pulsed laser ablation is an important process to induce the mechanical effect. Hence, based on studying the macroscopic mechanical properties, this paper deeply analyzes the impulse coupling mechanism of pulsed laser ablation by measuring the plasma plume and emission spectrum characteristics. In this paper, a single pulse laser with a wavelength of 1 064 nm is used to ablate aluminum targets. By constructing a fast photogrammetry system and optical emission spectroscopy measurement system, the plasma plume image, the plasma spectral image, and the plasma emission spectrum generated by laser oblique incident ablation of the aluminum target were obtained. Based on optical emission spectroscopy of the plasma plume, the Boltzmann plotting method and Stark broadening method were used to study the variation of plasma temperature and electron number density with the laser fluence at different incidence angles of a pulsed laser, respectively. Moreover, a torsion pendulum system was built to study the trend of the impulse coupling coefficient with the laser fluence along the direction of laser incident at various incident angles. The study follows the research ideas from the plume microscale evolution process to impulse macro mechanical properties analysis. The experimental results show that the luminescence intensity of the plasma plume strengthens with the laser fluence, accompanied by the rise of plume ionization degree. Moreover, the plasma temperature and electron number density increase rapidly, resulting in the impulse coupling coefficient heightening rapidly. When the laser fluence is greater than 15 J·cm-2, the plasma temperature and the electron number density are gradually saturated due to the plasma shielding effect. The change of plasma temperature and electron number density results in the decrease of impulse coupling coefficient with increased laser fluence. In addition, the plasma temperature and the electron number density decrease with the increase of incident angle, which reduces the impulse coupling coefficient. The results show that the coupling mechanism of the ablation impulse can be well analyzed using fast photography and optical emission spectroscopy. The results can provide a reference for optimising key parameters for space applications such as laser space debris removal, space micro-thruster and despinning non-cooperative targets in space.
于程浩，叶继飞，周伟静，常 浩，郭 威. 纳秒脉冲激光斜入射辐照铝靶等离子体羽流及微冲量特性研究[J]. 光谱学与光谱分析, 2023, 43(03): 933-939.
YU Cheng-hao, YE Ji-fei, ZHOU Wei-jing, CHANG Hao, GUO Wei. Characteristics of the Plasma Plume and Micro-Impulse Generated by
Irradiating the Aluminum Target With a Nanosecond Laser Pulse at
Oblique Incidence. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(03): 933-939.
[1] Wang B. Applied Physics Letters, 2017, 110(1): 014101.
[2] Ebisuzaki T, Quinn M N, Wada S, et al. Acta Astronautica, 2015, 112: 102.
[3] Kumar R, Sedwick R J. Journal of Spacecraft and Rockets, 2015, 52(4): 1129.
[4] Marla D, Bhandarkar U V, Joshi S S. Journal of Applied Physics, 2011, 109(2): 021101.
[5] Li X, Wei W, Wu J, et al. Journal of Applied Physics, 2013, 113(24): 243304.
[6] Hussein A E, Diwakar P K, Harilal S S, et al. Journal of Applied Physics, 2013, 113(14): 143305.
[7] ZHENG Pei-chao, LIU Hong-di, WANG Jin-mei, et al(郑培超，刘红弟，王金梅，等). Acta Photonica Sinica(光子学报), 2014, 43(9): 82.
[8] Chang H, Jin X, Zhou W. Optik, 2014, 125(12): 2923.
[9] Smijesh N, Rao K H, Chetty D, et al. Optical Letters, 2017，43：6081.
[10] WEN Ming, LI Nan-lei, WU Jie(文 明，李南雷，吴 洁). Infrared and Laser Engineering(红外与激光工程)，2017，46(S1): 1.
[11] DU Bang-deng, XING Bao-yu, YE Ji-fei, et al(杜邦登，邢宝玉，叶继飞，等). Infrared and Laser Engineering(红外与激光工程), 2020, 49(S2): 147.
[12] Shaim Md H A, Elsayed-Ali H E. Journal of Applied Physics, 2017, 122(20): 203301.
[13] Zhou W, Chang H, Ye J, et al. Laser Physics, 2020, 30(6): 066002.
[14] Vladoiu I, Stafe M, Popescu I M. University Politehnica of Bucharest Scientific Bulletin-Series A: Applied Mathematics and Physics, 2007, 69(3): 81.
[15] CHANG Hao, JIN Xing, WEN Ming, et al(常 浩，金 星，文 明，等). High Power Laser and Particle Beams(强激光与粒子束), 2013, 25(5): 1110.
[16] Haq S U, Ahmat L, Mumtaz M, et al. Physics of Plasmas, 2015, 22(8): 083504.
[17] Amin S, Bashir S, Anjum S, et al. Physics of Plasmas, 2017, 24(8): 083112.
[18] Sinko J E, Phipps C R. Applied Physics Letters, 2009, 95(13): 131105.
[19] Phipps C R, Luke J R, Lippert T, et al. Applied Physics A, 2004, 79(4-6): 1385.
