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
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.
Fund: 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).
Corresponding Authors:
Anmin Chen, Jianhui Han, Mingxing Jin
E-mail: amchen@jlu.edu.cn;hanjh17@mails.jlu.edu.cn;mxjin@jlu.edu.cn
Cite this article:
Yitong Liu(刘奕彤), Qiuyun Wang(王秋云), Luyun Jiang(蒋陆昀), Anmin Chen(陈安民), Jianhui Han(韩建慧), and Mingxing Jin(金明星) Femtosecond laser-induced Cu plasma spectra at different laser polarizations and sample temperatures 2022 Chin. Phys. B 31 105201
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