Novel Helmholtz-based photoacoustic sensor for trace gas detection at ppm level using GaInAsSb/GaAlAsSb DFB lasers

  • Mario Mattiello*
  • , Marc Niklès
  • , Stéphane Schilt
  • , Luc Thévenaz
  • , Abdelmajid Salhi
  • , David Barat
  • , Aurore Vicet
  • , Yves Rouillard
  • , Ralph Werner
  • , Johannes Koeth
  • *Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

A new and compact photoacoustic sensor for trace gas detection in the 2-2.5 μm atmospheric window is reported. Both the development of antimonide-based DFB lasers with singlemode emission in this spectral range and a novel design of photoacoustic cell adapted to the characteristics of these lasers are discussed. The laser fabrication was made in two steps. The structure was firstly grown by molecular beam epitaxy then a metallic DFB grating was processed. The photoacoustic cell is based on a Helmholtz resonator that was designed in order to fully benefit from the highly divergent emission of the antimonide laser. An optimized modulation scheme based on wavelength modulation of the laser source combined with second harmonic detection has been implemented for efficient suppression of wall noise. Using a 2211 nm laser, sub-ppm detection limit has been demonstrated for ammonia.

Original languageEnglish
Pages (from-to)952-958
Number of pages7
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume63
Issue number5
DOIs
Publication statusPublished - Apr 2006
Externally publishedYes

Keywords

  • Antimonide
  • Helmholtz resonator
  • Photoacoustic spectroscopy
  • Semiconductor lasers
  • Trace gas monitoring

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