Mid-infrared dual frequency comb spectroscopy based on fiber lasers for the detection of methane in ambient air

F. Zhu, A. Bicer, R. Askar, J. Bounds, A. A. Kolomenskii, V. Kelessides, Mahmood Amani, H. A. Schuessler

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Abstract

We utilize mid-infrared dual frequency comb spectroscopy for the detection of methane in ambient air. Two mid-infrared frequency comb sources based on femtosecond Er:fiber oscillators are produced through difference frequency generation with periodically poled MgO-doped lithium niobate crystals and stabilized at slightly different repetition rates at about 250 MHz. We performed dual frequency comb spectroscopy in the spectral range between 2900 cm-1 and 3150 cm-1 with 0.07 cm-1 resolution using a multipass cell of ∼580 m path length, and achieved the sensitivity about 7.6 × 10-7 cm-1 with 80 ms data acquisition time. We determined the methane concentration as ∼1.5 ppmv in the ambient air of the laboratory, and the detection limit as ∼60 ppbv for the current setup.

Original languageEnglish
Article number095701
JournalLaser Physics Letters
Volume12
Issue number9
DOIs
Publication statusPublished - 1 Sep 2015

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Keywords

  • dual frequency comb spectroscopy
  • infrared spectrometer
  • mid-infrared

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Instrumentation

Cite this

Zhu, F., Bicer, A., Askar, R., Bounds, J., Kolomenskii, A. A., Kelessides, V., Amani, M., & Schuessler, H. A. (2015). Mid-infrared dual frequency comb spectroscopy based on fiber lasers for the detection of methane in ambient air. Laser Physics Letters, 12(9), [095701]. https://doi.org/10.1088/1612-2011/12/9/095701