强激光与粒子束2013，Vol.25Issue(7)：1690-1696,7.DOI:10.3788/HPLPB20132507.1690
1064nm Nd:YAG激光诱导铁等离子体特征参数的研究
Measurements of iron plasma parameters produced by a 1064 nm pulsed Nd: YAG laser
摘要
Abstract
A 1064 nm pulsed Nd:YAG laser is used for the ablation of an iron bar sample in air at atmospheric pressure and the laser-induced plasma characteristics are examined.The electron number density of 8.7 × 1017 cm-3 in the iron plasma is inferred from the Stark broadened profile of Fe 1 376.553 nm averaged with 10 single spectra.In order to minimize relative errors in calculation of the electron temperature,an improved iterative Boltzmann plot method is used.Experimental results show that the electron temperature is 8058 K with a regression coefficient of 0.981 38.Based on the experimental results,the plasma is verified to be in local thermodynamic equilibrium (LTE) and free from self-absorption.Considering the laser photon frequency (2.82 ×1014 Hz) is larger than the plasma frequency (8.3 × 1012 Hz),the loss of energy due to reflection of the laser beam from the plasma can be assumed to be insignificant.Experiments also demonstrate that the inverse Bremsstrahlung (IB) absorption is the dominant photon absorption process during the laser-plasma interaction,and the corresponding IB absorption coefficient is 0.14 cm-1.关键词
原子发射光谱/激光诱导击穿光谱/等离子体/电子温度/电子数密度Key words
atomic emission spectroscopy/laser-induced breakdown spectroscopy/plasma/electron temperature/electron number density分类
数理科学引用本文复制引用
罗文峰,赵小侠,朱海燕,李冬冬,李晓莉..1064nm Nd:YAG激光诱导铁等离子体特征参数的研究[J].强激光与粒子束,2013,25(7):1690-1696,7.基金项目
Supported by the Young Scientists Fund of the National Natural Science Foundation of China (61108061),the Xi'an University of Posts and Telecommunications Foundation for Young Teachers,Xi'an Science and Technology Planning Project (CX12189WL02),and Scientific Research Program Funded by Shaanxi Provincial Education Department (2013JK0607,2013JK0620) （61108061）
