激光技术2011，Vol.35Issue(6)：800-803,4.DOI:10.3969/j.issn.1001-3806.2011.06.021
缓冲气压对CO2激光Al靶等离子体参量的影响
Analysis of the properties of CO2 laser-induced aluminum plasma at different ambient pressures
吴涛 1王新兵 2唐建 1饶志明 1王少义1
作者信息
- 1. 华中科技大学 光电子科学与工程学院 武汉光电国家实验室,武汉430074
- 2. 武汉工程大学理学院,武汉430074
- 折叠
摘要
Abstract
In order to study the properties of laser-induced plasma at different ambient pressures, emission spectroscopy was studied on aluminum plasma generated by C02 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 x 1016cm-3 ~ 10. 5 x 1016cm-3, as the ambient pressure was varied from 10-4Pa to 2 x 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.关键词
激光技术/等离子体光谱/电子密度/电子温度Key words
laser technique/ plasma spectroscopy/ electron density/ electron temperature分类
数理科学引用本文复制引用
吴涛,王新兵,唐建,饶志明,王少义..缓冲气压对CO2激光Al靶等离子体参量的影响[J].激光技术,2011,35(6):800-803,4.
