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Gas spectroscopy and optical path-length assessment in scattering media using a frequency-modulated continuous-wave diode laser

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Author

  • Liang Mei
  • Hiran Jayaweera
  • Patrik Lundin
  • Sune Svanberg
  • Gabriel Somesfalean

Summary, in English

Simultaneous assessment of the spectroscopic absorption signal of gas enclosed in a scattering medium and the corresponding optical path length of the probing light is demonstrated using a single setup. Sensitive gas absorption measurements are performed by a tunable diode laser using wavelength-modulation spectroscopy, while the path length is evaluated by the frequency-modulated cw technique commonly used in the field of telecommunication. Proof-of-principle measurements are demonstrated with water vapor as the absorbing gas and using polystyrene foam as an inhomogeneously scattering medium. The combination of these techniques opens up new possibilities for straightforward evaluation of gas presence and exchange in scattering media. (C) 2011 Optical Society of America

Department/s

Publishing year

2011

Language

English

Pages

3036-3038

Publication/Series

Optics Letters

Volume

36

Issue

16

Document type

Journal article

Publisher

Optical Society of America

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0146-9592