中国物理B ›› 2022, Vol. 31 ›› Issue (10): 105201-105201.doi: 10.1088/1674-1056/ac6864

所属专题: SPECIAL TOPIC — Celebrating the 70th Anniversary of the Physics of Jilin University

• SPECIAL TOPIC—Celebrating the 70th Anniversary of the Physics of Jilin University • 上一篇    下一篇

Femtosecond laser-induced Cu plasma spectra at different laser polarizations and sample temperatures

Yitong Liu(刘奕彤)1, Qiuyun Wang(王秋云)1, Luyun Jiang(蒋陆昀)2, Anmin Chen(陈安民)1,†, Jianhui Han(韩建慧)2,‡, and Mingxing Jin(金明星)1,§   

  1. 1. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
    2. State Key Laboratory of Laser Propulsion & Application, Department of Aerospace Science and Technology, Space Engineering University, Beijing 101416, China
  • 收稿日期:2022-03-02 修回日期:2022-04-04 出版日期:2022-10-16 发布日期:2022-09-16
  • 通讯作者: Anmin Chen, Jianhui Han, Mingxing Jin E-mail:amchen@jlu.edu.cn;hanjh17@mails.jlu.edu.cn;mxjin@jlu.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2019YFA0307701) and the National Natural Science Foundation of China (Grant Nos. 11974138, 11674128, and 11674124).

Femtosecond laser-induced Cu plasma spectra at different laser polarizations and sample temperatures

Yitong Liu(刘奕彤)1, Qiuyun Wang(王秋云)1, Luyun Jiang(蒋陆昀)2, Anmin Chen(陈安民)1,†, Jianhui Han(韩建慧)2,‡, and Mingxing Jin(金明星)1,§   

  1. 1. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
    2. State Key Laboratory of Laser Propulsion & Application, Department of Aerospace Science and Technology, Space Engineering University, Beijing 101416, China
  • Received:2022-03-02 Revised:2022-04-04 Online:2022-10-16 Published:2022-09-16
  • Contact: Anmin Chen, Jianhui Han, Mingxing Jin E-mail:amchen@jlu.edu.cn;hanjh17@mails.jlu.edu.cn;mxjin@jlu.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2019YFA0307701) and the National Natural Science Foundation of China (Grant Nos. 11974138, 11674128, and 11674124).

摘要: Laser-induced breakdown spectroscopy (LIBS) is a good technique for detecting and analyzing material elements due to the plasma emission produced by the high-power laser pulse. Currently, a significant topic of LIBS research is improving the emission intensity of LIBS. This study investigated the effect of laser-polarization on femtosecond laser-ablated Cu plasma spectra at different sample temperatures. The measured lines under circularly polarized lasers were higher than those under linearly and elliptically polarized lasers. The enhancement effect was evident at higher Cu temperatures when comparing the plasma spectra that have circular and linear polarizations for different target temperatures. To understand the influence of laser-polarization and sample temperature on signal intensity, we calculated the plasma temperature (PT) and electron density (ED) . The change in PT and ED was consistent with the change in the atomic lines as the laser polarization was being adjusted. When raising the Cu temperature, the PT increased while the ED decreased. Raising the Cu temperature whilst adjusting the laser-polarization is effective for improving the signal of femtosecond LIBS compared to raising the initial sample temperature alone or only changing the laser polarization.

关键词: laser-induced breakdown spectroscopy, femtosecond pulse, laser-polarization, target temperature, plasma temperature, electron density

Abstract: Laser-induced breakdown spectroscopy (LIBS) is a good technique for detecting and analyzing material elements due to the plasma emission produced by the high-power laser pulse. Currently, a significant topic of LIBS research is improving the emission intensity of LIBS. This study investigated the effect of laser-polarization on femtosecond laser-ablated Cu plasma spectra at different sample temperatures. The measured lines under circularly polarized lasers were higher than those under linearly and elliptically polarized lasers. The enhancement effect was evident at higher Cu temperatures when comparing the plasma spectra that have circular and linear polarizations for different target temperatures. To understand the influence of laser-polarization and sample temperature on signal intensity, we calculated the plasma temperature (PT) and electron density (ED) . The change in PT and ED was consistent with the change in the atomic lines as the laser polarization was being adjusted. When raising the Cu temperature, the PT increased while the ED decreased. Raising the Cu temperature whilst adjusting the laser-polarization is effective for improving the signal of femtosecond LIBS compared to raising the initial sample temperature alone or only changing the laser polarization.

Key words: laser-induced breakdown spectroscopy, femtosecond pulse, laser-polarization, target temperature, plasma temperature, electron density

中图分类号:  (Plasma production and heating by shock waves and compression)

  • 52.50.Lp
52.38.Mf (Laser ablation) 32.30.Jc (Visible and ultraviolet spectra) 42.62.Fi (Laser spectroscopy)