Re-Heating Effect on the Enhancement of Plasma Emission Generated from Fe Under Femtosecond Double-Pulse Laser Irradiation  

作　　者：王莹 陈安民 李苏宇 隋来志 刘敦利 李舒畅 李贺 姜远飞 金明星 

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University [2]State Key Laboratory of Laser Propulsion & Application,Equiqment Academy [3]Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy,Jilin University

出　　处：《Plasma Science and Technology》2016年第12期1192-1197,共6页等离子体科学和技术（英文版）

基　　金：supported by the National Basic Research Program of China(No.2013CB922200);the China Postdoctoral Science Foundation(No.2014M551169);National Natural Science Foundation of China(Nos.11674128,11474129 and 11504129)

摘　　要：In this paper, we present a study on the effect of inter-pulse delay using femtosecond double-pulse laser-induced breakdown spectroscopy in a collinear geometry. The temporal evolution of spectral intensity is performed for the lines of Fe I 423.60 nm, Fe I 425.08 nm and Fe I 427.18 nm. It is found that, by selecting appropriate inter-pulse delay, the signal enhancement can be significantly increased compared with the single-pulse case. A three-fold enhancement in the current experiment is obtained. The plasma temperature and electron density are also investigated based on the theory of Boltzmann plot and Stark broadening. We attribute the main mechanism for emission enhancement to the plasma re-heating effect.In this paper, we present a study on the effect of inter-pulse delay using femtosecond double-pulse laser-induced breakdown spectroscopy in a collinear geometry. The temporal evolution of spectral intensity is performed for the lines of Fe I 423.60 nm, Fe I 425.08 nm and Fe I 427.18 nm. It is found that, by selecting appropriate inter-pulse delay, the signal enhancement can be significantly increased compared with the single-pulse case. A three-fold enhancement in the current experiment is obtained. The plasma temperature and electron density are also investigated based on the theory of Boltzmann plot and Stark broadening. We attribute the main mechanism for emission enhancement to the plasma re-heating effect.

关 键 词：LIBS femtosecond laser double-pulse signal enhancement 

分 类 号：O53[理学—等离子体物理] TN24[理学—物理]