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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 7 — Mar. 1, 2012
  • pp: B30–B41

Toward the optimization of double-pulse LIBS underwater: effects of experimental parameters on the reproducibility and dynamics of laser-induced cavitation bubble

Gabriele Cristoforetti, Marco Tiberi, Andrea Simonelli, Paolo Marsili, and Francesco Giammanco  »View Author Affiliations


Applied Optics, Vol. 51, Issue 7, pp. B30-B41 (2012)
http://dx.doi.org/10.1364/AO.51.000B30


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Abstract

Double-pulse laser-induced breakdown spectroscopy (LIBS) was recently proposed for the analysis of underwater samples, since it overcomes the drawbacks of rapid plasma quenching and of large continuum emission, typical of single-pulse ablation. Despite the attractiveness of the method, this approach suffers nevertheless from a poor spectroscopic reproducibility, which is partially due to the scarce reproducibility of the cavitation bubble induced by the first laser pulse, since pressure and dimensions of the bubble strongly affect plasma emission. In this work, we investigated the reproducibility and the dynamics of the cavitation bubble induced on a solid target in water, and how they depend on pulse duration, energy, and wavelength, as well as on target composition. Results are discussed in terms of the effects on the laser ablation process produced by the crater formation and by the interaction of the laser pulse with floating particles and gas bubbles. This work, preliminary to the optimization of the spectroscopic signal, provides an insight of the phenomena occurring during laser ablation in water, together with useful information for the choice of the laser source to be used in the apparatus.

© 2012 Optical Society of America

OCIS Codes
(010.7340) Atmospheric and oceanic optics : Water
(290.5850) Scattering : Scattering, particles
(350.5400) Other areas of optics : Plasmas
(300.6365) Spectroscopy : Spectroscopy, laser induced breakdown
(110.6915) Imaging systems : Time imaging

History
Original Manuscript: September 19, 2011
Revised Manuscript: January 10, 2012
Manuscript Accepted: January 17, 2012
Published: February 7, 2012

Citation
Gabriele Cristoforetti, Marco Tiberi, Andrea Simonelli, Paolo Marsili, and Francesco Giammanco, "Toward the optimization of double-pulse LIBS underwater: effects of experimental parameters on the reproducibility and dynamics of laser-induced cavitation bubble," Appl. Opt. 51, B30-B41 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-7-B30

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