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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 31 — Nov. 1, 2008
  • pp: G122–G130

Single pulse laser-induced breakdown spectroscopy of bulk aqueous solutions at oceanic pressures: interrelationship of gate delay and pulse energy

Anna P. M. Michel and Alan D. Chave  »View Author Affiliations


Applied Optics, Vol. 47, Issue 31, pp. G122-G130 (2008)
http://dx.doi.org/10.1364/AO.47.00G122


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Abstract

The ability of oceanographers to make sustained measurements of ocean processes is limited by the number of available sensors for long-term in situ analysis. In recent years, laser-induced breakdown spectroscopy (LIBS) has been identified as a viable technique to develop into an oceanic chemical sensor. We performed single pulse laser-induced breakdown spectroscopy of high pressure bulk aqueous solutions to detect three analytes (sodium, manganese, and calcium) that are of key importance in hydrothermal vent fluids, an ocean environment that would greatly benefit from the development of an oceanic LIBS sensor. The interrelationship of the key experimental parameters, pulse energy and gate delay, for a range of pressures up to 2.76 × 10 7 Pa , is studied. A minimal effect of pressure on the peak intensity is observed. A short gate delay (less than 200 ns ) must be used at all pressures. The ability to use a relatively low laser pulse energy (less than 60 mJ ) for detection of analytes at high pressure is also established. Na, Mn, and Ca are detectable at pressures up to 2.76 × 10 7 Pa at 50, 500, and 50 ppm , respectively, using an Echelle spectrometer.

© 2008 Optical Society of America

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3440) Lasers and laser optics : Laser-induced breakdown
(300.0300) Spectroscopy : Spectroscopy
(300.6365) Spectroscopy : Spectroscopy, laser induced breakdown

History
Original Manuscript: March 31, 2008
Revised Manuscript: August 2, 2008
Manuscript Accepted: August 12, 2008
Published: September 19, 2008

Virtual Issues
Vol. 4, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Anna P. M. Michel and Alan D. Chave, "Single pulse laser-induced breakdown spectroscopy of bulk aqueous solutions at oceanic pressures: interrelationship of gate delay and pulse energy," Appl. Opt. 47, G122-G130 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-31-G122

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