Jump to main content
Jump to site search

Issue 4, 2004
Previous Article Next Article

Remote LIBS with ultrashort pulses: characteristics in picosecond and femtosecond regimes

Author affiliations

Abstract

Using a container-integrated mobile femtosecond terawatt laser system with integrated detection unit (Teramobile), we have demonstrated remote laser-induced breakdown spectroscopy (R-LIBS) on copper and aluminium samples with targets located at 25 m away from the container. The ability of our laser system to generate pulses in the femtosecond, picosecond and nanosecond regimes allowed us to perform direct comparisons between these three pulse durations. The dependence of the fluorescence signal on laser pulse energy showed a nonlinear behavior with a threshold, which is consistent with the previous observations for laser ablation. Such nonlinear behavior leads to a dependence of the LIBS signal on the temporal-spectral shape of the laser pulse. We showed especially that the transform-limited pulse does not optimize the fluorescence. A properly applied chirp allows an increase of the LIBS signal. Understanding and optimization of the chirp effect would improve the detection limit of the LIBS using a femtosecond laser (Femto-LIBS) and lead to a larger detection distance. Furthermore the use of pulse shaping should enhance the detection specificity for the cases of spectral overlapping between several elements to be identified.

Back to tab navigation
Please wait while Download options loads

Publication details

The article was received on 15 Dec 2003, accepted on 23 Feb 2004 and first published on 04 Mar 2004


Article type: Paper
DOI: 10.1039/B316343A
Citation: J. Anal. At. Spectrom., 2004,19, 437-444
  •   Request permissions

    Remote LIBS with ultrashort pulses: characteristics in picosecond and femtosecond regimes

    Ph. Rohwetter, J. Yu, G. Méjean, K. Stelmaszczyk, E. Salmon, J. Kasparian, J.-P. Wolf and L. Wöste, J. Anal. At. Spectrom., 2004, 19, 437
    DOI: 10.1039/B316343A

Search articles by author