Applied Physics B

, 83:261

Application of a continuous-wave tunable erbium-doped fiber laser to molecular spectroscopy in the near infrared

  • J. Cousin
  • P. Masselin
  • W. Chen
  • D.  Boucher
  • S. Kassi
  • D. Romanini
  • P. Szriftgiser
Article

DOI: 10.1007/s00340-006-2162-9

Cite this article as:
Cousin, J., Masselin, P., Chen, W. et al. Appl. Phys. B (2006) 83: 261. doi:10.1007/s00340-006-2162-9

Abstract

Development of a continuous-wave tunable fiber laser-based spectrometer for applied spectroscopy is reported. Wide wavelength tunability of an erbium-doped fiber laser (EDFL) was investigated in the near-infrared region of 1543–1601 nm. Continuous mode-hop free fine frequency tuning has been accomplished by temperature tuning in conjunction with mechanical tuning. The overall spectroscopic performance of the EDFL was evaluated in terms of frequency tunability along with its suitability for molecular spectroscopy. High-resolution absorption spectra of acetylene (C2H2) were recorded near 1544 nm with a minimum measurable absorption coefficient of about 3.5×10-7 cm-1/Hz1/2 for direct absorption spectroscopy associated with a 100-m long multipass cell. Detections of C2H2 at different concentration levels were performed as well with high dynamic detection range varying from 100% purity to sub ppmv using cavity ring down spectroscopy. A 3σ-detection-limited minimum detectable concentration (MDC) of 400 ppbv has been obtained by using the transition line Pe(22) of the ν1351g)-ν51u) hot band near 1543.92 nm with a detection bandwidth of 2.3 Hz. This corresponds to a minimum detectable absorption coefficient of 6.6×10-11 cm-1/Hz1/2. The sensitivity limit could be further improved by almost one order of magnitude (down to ∼60 ppbv) by use of the Pe(27) line of the ν13u+)-0(Σg+)combination band near 1543.68 nm.

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • J. Cousin
    • 1
  • P. Masselin
    • 1
  • W. Chen
    • 1
  • D.  Boucher
    • 1
  • S. Kassi
    • 2
  • D. Romanini
    • 2
  • P. Szriftgiser
    • 3
  1. 1.Laboratoire de Physicochimie de l’Atmosphère, CNRS UMR 8101Université du Littoral Côte d’OpaleDunkerqueFrance
  2. 2.Laboratoire de Spectrométrie Physique, CNRS UMR 5588Université J. Fourier de GrenobleSt. Martin d’HèresFrance
  3. 3.Laboratoire de Physique des Lasers, Atomes et Molécules, CNRS UMR 8523Université des Sciences et Technologies de LilleVilleneuve d’Ascq CedexFrance

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