PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Effect of matrix thermal properties on laser-induced plasma |
Yuheng Shan(单宇恒), An Li(李安), Xinyu Zhang(张新宇), Wen Yi(易文), Ying Zhang(张颖), Xiaodong Liu(刘晓东), and Ruibin Liu(刘瑞斌)† |
Key Laboratory of Precision Spectroscopy and Optoelectronic Technology, School of Physics, Beijing Institute of Technology, Beijing 100081, China |
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Abstract The matrix thermal properties have an important impact on laser-induced plasma, as the thermal effect dominates the interaction between ns-pulsed laser and matter, especially in metals. We used a series of pure metals and aluminum alloys to measure plasma temperature and electron density through laser-induced breakdown spectroscopy, in order to investigate the effect of matrix thermal properties on laser-induced plasma. In pure metals, a significant negative linear correlation was observed between the matrix thermal storage coefficient and plasma temperature, while a weak correlation was observed with electron density. The results indicate that metals with low thermal conductivity or specific heat capacity require less laser energy for thermal diffusion or melting and evaporation, resulting in higher ablation rates and higher plasma temperatures. However, considering ionization energy, thermal effects may be a secondary factor affecting electron density. The experiment of aluminum alloy further confirms the influence of thermal conductivity on plasma temperature and its mechanism explanation.
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Received: 08 May 2024
Revised: 19 June 2024
Accepted manuscript online: 12 July 2024
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PACS:
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52.38.-r
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(Laser-plasma interactions)
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Fund: Project supported by the National Key Research and Development Project (Grant No. 2018YFC2001100). |
Corresponding Authors:
Ruibin Liu
E-mail: lirsir@bit.edu.cn
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Cite this article:
Yuheng Shan(单宇恒), An Li(李安), Xinyu Zhang(张新宇), Wen Yi(易文), Ying Zhang(张颖), Xiaodong Liu(刘晓东), and Ruibin Liu(刘瑞斌) Effect of matrix thermal properties on laser-induced plasma 2024 Chin. Phys. B 33 105202
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