中国物理B ›› 2024, Vol. 33 ›› Issue (10): 105202-105202.doi: 10.1088/1674-1056/ad6251

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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)†   

  1. Key Laboratory of Precision Spectroscopy and Optoelectronic Technology, School of Physics, Beijing Institute of Technology, Beijing 100081, China
  • 收稿日期:2024-05-08 修回日期:2024-06-19 接受日期:2024-07-12 发布日期:2024-09-21
  • 通讯作者: Ruibin Liu E-mail:lirsir@bit.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Project (Grant No. 2018YFC2001100).

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)†   

  1. Key Laboratory of Precision Spectroscopy and Optoelectronic Technology, School of Physics, Beijing Institute of Technology, Beijing 100081, China
  • Received:2024-05-08 Revised:2024-06-19 Accepted:2024-07-12 Published:2024-09-21
  • Contact: Ruibin Liu E-mail:lirsir@bit.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Project (Grant No. 2018YFC2001100).

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摘要： 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.

关键词: laser-induced plasma, thermal properties, matrix effect, thermal storage coefficient, plasma temperature

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.

Key words: laser-induced plasma, thermal properties, matrix effect, thermal storage coefficient, plasma temperature

中图分类号:  (Laser-plasma interactions)

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