Plasma temperature clamping in filamentation laser induced breakdown spectroscopy

S. S. Harilal, J. Yeak, M. C. Phillips

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Ultrafast laser filament induced breakdown spectroscopy is a very promising method for remote material detection. We present characteristics of plasmas generated in a metal target by laser filaments in air. Our measurements show that the temperature of the ablation plasma is clamped along the filament channel due to intensity clamping in a filament. Nevertheless, significant changes in radiation intensity are noticeable, and this is essentially due to variation in the number density of emitting atoms. The present results also explain the near absence of ion emission but strong atomic neutral emission from plumes produced during fs LIBS in air.

Original languageEnglish (US)
Pages (from-to)27113-27122
Number of pages10
JournalOptics Express
Volume23
Issue number21
DOIs
StatePublished - Oct 19 2015
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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