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

SHEN Jie (沈洁); YANG Zhengcai (杨正才); LIU Xiaoliang (刘小亮); SHI Yanchao (史彦超); ZHAO Peixi (赵培茜); SUN Shaohua (孙少华); HU Bitao (胡碧涛)

doi:10.1088/1009-0630/17/2/09

Plasma Science and Technology > 2015 > 17(2): 147-152. > DOI: 10.1088/1009-0630/17/2/09

SHEN Jie (沈洁), YANG Zhengcai (杨正才), LIU Xiaoliang (刘小亮), SHI Yanchao (史彦超), ZHAO Peixi (赵培茜), SUN Shaohua (孙少华), HU Bitao (胡碧涛). Analysis of Enhanced Laser-Induced Breakdown Spectroscopy with Double Femtosecond Laser Pulses[J]. Plasma Science and Technology, 2015, 17(2): 147-152. DOI: 10.1088/1009-0630/17/2/09

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

1 School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China 2 Lanzhou Commercial College, Lanzhou 730000, China

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

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Received Date: May 27, 2014

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Abstract

Abstract

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.
- LIBS,
- femtosecond laser,
- double pulse,
- signal enhancement

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