Sensitive CH_4 detection applying quantum cascade laser based optical feedback cavity-enhanced absorption spectroscopy | Zendy

Norbert Lang | Zendy; Uwe Macherius | Zendy; M. Wiese | Zendy; Henrik Zimmermann | Zendy; J. Röpcke | Zendy; J. H. van Helden | Zendy

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Sensitive CH_4 detection applying quantum cascade laser based optical feedback cavity-enhanced absorption spectroscopy

Author(s) -

Norbert Lang,

Uwe Macherius,

M. Wiese,

Henrik Zimmermann,

J. Röpcke,

J. H. van Helden

Publication year - 2016

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.24.00a536

Subject(s) - quantum cascade laser , optics , laser , spectrometer , cascade , spectroscopy , absorption spectroscopy , materials science , tunable diode laser absorption spectroscopy , cavity ring down spectroscopy , attenuation coefficient , absorption (acoustics) , optical cavity , distributed feedback laser , optoelectronics , physics , chemistry , chromatography , quantum mechanics

We report on sensitive detection of atmospheric methane employing quantum cascade laser based optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS). An instrument has been built utilizing a continuous-wave distributed feedback quantum cascade laser (cw-QCL) with a V-shaped cavity, a common arrangement that reduces feedback to the laser from non-resonant reflections. The spectrometer has a noise equivalent absorption coefficient of 3.6 × 10 -9 cm -1 Hz -1 / 2 for a spectral scan of CH 4 at 7.39 μm. From an Allan-Werle analysis a detection limit of 39 parts per trillion of CH 4 at atmospheric pressure within 50 s acquisition time was found.

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