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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 23 — Nov. 13, 2006
  • pp: 11442–11452

Looking into the volcano with a Mid-IR DFB diode laser and Cavity Enhanced Absorption Spectroscopy

S. Kassi, M. Chenevier, L. Gianfrani, A. Salhi, Y. Rouillard, A. Ouvrard, and D. Romanini  »View Author Affiliations

Optics Express, Vol. 14, Issue 23, pp. 11442-11452 (2006)

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We report on the first application of extended–wavelength DFB diode lasers to Cavity–Enhanced Absorption Spectroscopy in-situ trace measurements on geothermal gases. The emission from the most active fumarole at the Solfatara volcano near Naples (Italy) was probed for the presence of CO and CH4. After passing through a gas dryer and cooler, the volcanic gas flow (98% CO2) was analysed in real time for the concentration of these species, whose relatively strong absorption lines could be monitored simultaneously by a single Distributed Feed–Back (DFB) GaSb-based diode laser emitting around 2.33µm (4300 cm-1) at room temperature. The concentrations were found to be about 3 ppm and 75 ppm, respectively, while actual detection limits for these molecules are around 1 ppb. We discuss the possibility of detecting other species of interest for volcanic emission monitoring.

© 2006 Optical Society of America

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(140.3490) Lasers and laser optics : Lasers, distributed-feedback
(230.5750) Optical devices : Resonators
(300.1030) Spectroscopy : Absorption

ToC Category:

Original Manuscript: August 4, 2006
Revised Manuscript: September 14, 2006
Manuscript Accepted: September 14, 2006
Published: November 13, 2006

S. Kassi, M. Chenevier, L. Gianfrani, A. Salhi, Y. Rouillard, A. Ouvrard, and D. Romanini, "Looking into the volcano with a Mid-IR DFB diode laser and Cavity Enhanced Absorption Spectroscopy," Opt. Express 14, 11442-11452 (2006)

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