Analysis of the properties of CO2 laser-induced aluminum plasma at different ambient pressures
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1.
Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
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2.
School of Science, Wuhan Institute of Technology, Wuhan 430074, China
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Corresponding author:
WANG Xin-bing, xbwang@mail.hust.edu.cn
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Received Date:
2011-03-02
Accepted Date:
2011-04-18
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Abstract
In order to study the properties of laser-induced plasma at different ambient pressures, emission spectroscopy was studied on aluminum plasma generated by CO2 laser with energy of 180mJ/pulse at different air ambient pressures. The dependency of plasma temperature and density on ambient pressures were estimated from the analysis of spectral data by assuming the conditions of local thermodynamic equilibrium and optically thin plasma. Electron temperature was measured in the range of 1.05eV~2.47eV, and electron density was measured in the range of 1.95 1016cm-310.5 1016cm-3, as the ambient pressure was varied from 10-4Pa to 2 103Pa. The results show that the plasma temperature decreases with the ambient pressures. At first, the electron density decreases with the increase of ambient pressure under low pressure. When the pressure reaches 600Pa, the broken air plasma may interact with Al vapor and the electron density increases with the pressure increasing. For larger ambient pressure up to 3000Pa, the Al emission lines eventually disappear, suggesting that the laser energy is almost screened by the air plasma. The results provide useful guidance to understand the influence of air pressure on laser-matter interaction.
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