Special issue paper

Fresenius' Journal of Analytical Chemistry

, Volume 369, Issue 3, pp 320-327

First online:

LIBS using dual- and ultra-short laser pulses

  • S. M. AngelAffiliated withDepartment of Chemistry and Biochemistry, The University of South Carolina, Columbia, SC 29208, USA
  • , Dimitra N. StratisAffiliated withDepartment of Chemistry and Biochemistry, The University of South Carolina, Columbia, SC 29208, USA
  • , Kristine L. ElandAffiliated withDepartment of Chemistry and Biochemistry, The University of South Carolina, Columbia, SC 29208, USA
  • , Tianshu LaiAffiliated withDepartment of Chemistry and Biochemistry, The University of South Carolina, Columbia, SC 29208, USA
  • , Mark A. BergAffiliated withDepartment of Chemistry and Biochemistry, The University of South Carolina, Columbia, SC 29208, USA
  • , David M. GoldAffiliated withMedical Technology Program, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA

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Abstract

Pre-ablation dual-pulse LIBS enhancement data for copper, brass and steel using ns laser excitation are reported. Although large enhancements are observed for all samples, the magnitude of the enhancement is matrix dependent. Whereas all of the dual-pulse studies used ns laser excitation we see interesting effects when using ps and fs laser excitation for single-pulse LIBS. LIBS spectra of copper using 1.3 ps and 140 fs laser pulses show much lower background signals compared to ns pulse excitation. Also, the atomic emission decays much more rapidly with time. Because of relatively low backgrounds when using ps and fs pulses, non-gated detection of LIBS is shown to be very effective. The plasma dissipates quickly enough using ps and fs laser pulses, that high pulse rates, up to 1000 Hz, are effective for increasing the LIBS signal, for a given measurement time. Finally, a simple near-collinear dual-pulse fiber-optic LIBS probe is shown to be useful for enhanced LIBS measurements.