Applied Physics B

, Volume 103, Issue 1, pp 223–228

Rapid and sensitive trace gas detection with continuous wave Optical Parametric Oscillator-based Wavelength Modulation Spectroscopy

Authors

    • Life Science Trace Gas Facility, Molecular and Laser Physics, Institute for Molecules and MaterialsRadboud University
  • M. Spunei
    • Life Science Trace Gas Facility, Molecular and Laser Physics, Institute for Molecules and MaterialsRadboud University
    • VSL
  • A. K. Y. Ngai
    • Life Science Trace Gas Facility, Molecular and Laser Physics, Institute for Molecules and MaterialsRadboud University
  • S. M. Cristescu
    • Life Science Trace Gas Facility, Molecular and Laser Physics, Institute for Molecules and MaterialsRadboud University
  • I. D. Lindsay
    • EPSRC Advanced Research Fellow Nanophysics and Soft Matter Group, H.H. Wills Physics LaboratoryUniversity of Bristol
  • S. T. Persijn
    • VSL
  • K. J. Boller
    • Laser Physics and Nonlinear Optics Group, Faculty of Science and TechnologyUniversity of Twente
  • F. J. M. Harren
    • Life Science Trace Gas Facility, Molecular and Laser Physics, Institute for Molecules and MaterialsRadboud University
Open AccessArticle

DOI: 10.1007/s00340-010-4242-0

Cite this article as:
Arslanov, D.D., Spunei, M., Ngai, A.K.Y. et al. Appl. Phys. B (2011) 103: 223. doi:10.1007/s00340-010-4242-0

Abstract

A fiber-amplified Distributed Bragg Reflector diode laser is used to pump a continuous wave, singly resonant Optical Parametric Oscillator (OPO). The output radiation covers the 3–4 μm with ability of rapid (100 THz/s) and broad mode-hop-free tuning (5 cm−1). Wavelength Modulation Spectroscopy is combined with the OPO to take optimal advantage of the spectral scan speed. The sensitivity of the system was determined as 0.8 ppbv (parts-per-billion by volume) for ethane (C2H6) for the absorption peak at 2996.9 cm−1 recorded in 1.3 seconds, corresponding to a noise equivalent absorption sensitivity (NEAS) of 1.2×10−9 cm−1/Hz1/2. A comparison between results using the 1st, 2nd and 4th harmonic derivative signal from wavelength modulation was performed. The broad continuous tunability was demonstrated by covering 35 cm−1 while recording absorption features of ethane, methane and water.

Copyright information

© The Author(s) 2010