期刊
PLASMA SCIENCE & TECHNOLOGY
卷 17, 期 2, 页码 147-152出版社
IOP PUBLISHING LTD
DOI: 10.1088/1009-0630/17/2/09
关键词
LIBS; femtosecond laser; double pulse; signal enhancement
资金
- National Natural Science Foundation of China [11135002, 11075069, 91026021, 11075068]
- Fundamental Research Funds for the Central Universities of China [lzujbky-2014-13, lzujbky-2014-14, lzujbky-2014-10, lzujbky-2014-15]
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. Double-pulse 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.
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