Analysis of Enhanced Laser-Induced Breakdown Spectroscopy with Double Femtosecond Laser Pulses  

作　　者：沈洁 杨正才 刘小亮 史彦超 赵培茜 孙少华 胡碧涛 

机构地区：[1]School of Nuclear Science and Technology,Lanzhou University [2]Lanzhou Commercial College

出　　处：《Plasma Science and Technology》2015年第2期147-152,共6页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.11135002,11075069,91026021 and 11075068);Fundamental Research Funds for the Central Universities of China(lzujbky-2014-13,lzujbky-2014-14,lzujbky-2014-10 and lzujbky-2014-15)

摘　　要：In this paper, an experimental study of collinear geometry double-pulse femtosecond LIBS was performed on a Ni sample in ambient air in an effort to clarify the contributing processes responsible for the signal enhancement observed in comparison with the single-pulse case. Doublepulse LIBS spectra show a very clear enhancement when an optimum inter-pulse delay was used. The influences of the inter-pulse delay between two pulses on the LIBS signal intensity, electron temperature and density were investigated. It is most remarkable that the evolutions of signal enhancement and electron temperature versus the inter-pulse delay showed the same behavior and revealed two main regimes of interaction. These results provide additional insight into the possible emission enhancement mechanisms in the double pulse configuration.In this paper, an experimental study of collinear geometry double-pulse femtosecond LIBS was performed on a Ni sample in ambient air in an effort to clarify the contributing processes responsible for the signal enhancement observed in comparison with the single-pulse case. Doublepulse LIBS spectra show a very clear enhancement when an optimum inter-pulse delay was used. The influences of the inter-pulse delay between two pulses on the LIBS signal intensity, electron temperature and density were investigated. It is most remarkable that the evolutions of signal enhancement and electron temperature versus the inter-pulse delay showed the same behavior and revealed two main regimes of interaction. These results provide additional insight into the possible emission enhancement mechanisms in the double pulse configuration.

关 键 词：LIBS femtosecond laser double pulse signal enhancement 

分 类 号：TN249[电子电信—物理电子学] O437[机械工程—光学工程]