Influence of electron dynamics on the enhancement of double-pulse femtosecond laser-induced breakdown spectroscopy of fused silica

Zhitao Cao, Lan Jiang, Sumei Wang, Mengmeng Wang, Lei Liu, Fan Yang, Yongfeng Lu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Femtosecond laser pulse train induced breakdown of fused silica was studied by investigating its plasma emission and the ablated crater morphology. It was demonstrated that the electron dynamics in the ablated fused silica play a dominant role in the emission intensity of induced plasma and the volume of material removal, corresponding to the evolution of free-electron, self-trapped excitons, and the phase change of the fused silica left over by the first pulse. For a fluence of 11 J/cm2, the maximum plasma intensity of double-pulse irradiation at an interpulse delay of 120 ps was about 35 times stronger than that of a single-pulse, while the ablated crater was reduced by 27% in volume. The ionization of slow plume component generated by the first pulse was found to be the main reason for the extremely high intensity enhancement for an interpulse delay of over 10 ps. The results serve as a route to simultaneously increase the spatial resolution and plasma intensity in laser-induced breakdown spectroscopy of dielectrics.

Original languageEnglish (US)
Pages (from-to)63-69
Number of pages7
JournalSpectrochimica Acta - Part B Atomic Spectroscopy
Volume141
DOIs
StatePublished - Mar 2018

Keywords

  • Double pulse
  • Electron dynamics
  • Femtosecond laser
  • Laser-induced breakdown spectroscopy

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

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