Characterization of laser-induced plasmas associated with energetic laser cleaning of metal particles on fused silica surfaces

Candace D. Harris, Nan Shen, Alexander M. Rubenchik, Stavros G. Demos, Manyalibo J. Matthews

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Time-resolved plasma emission spectroscopy was used to characterize the energy coupling and temperature rise associated with single, 10-ns pulsed laser ablation of metallic particles bound to transparent substrates. Plasma associated with Fe(I) emission lines originating from steel microspheres was observed to cool from >24,000 to ∼15,000 K over ∼220 ns as τ-0.28, consistent with radiative losses and adiabatic gas expansion of a relatively free plasma. Simultaneous emission lines from Si(II) associated with the plasma etching of the SiO2 substrate were observed yielding higher plasma temperatures, ∼35,000 K, relative to the Fe(I) plasma. The difference in species temperatures is consistent with plasma confinement at the microsphere-substrate interface as the particle is ejected, and is directly visualized using pump-probe shadowgraphy as a function of pulsed laser energy.

Original languageEnglish (US)
Pages (from-to)5212-5218
Number of pages7
JournalOptics Letters
Volume40
Issue number22
DOIs
StatePublished - Nov 15 2015
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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