TY - JOUR
T1 - A mid-infrared dual-comb spectrometer in step-sweep mode for high-resolution molecular spectroscopy
AU - Lepere, Muriel
AU - Browet, Olivier
AU - Clement, Jean
AU - Vispoel, Bastien
AU - Allmendinger, Pitt
AU - Hayden, J.
AU - Eigenmann, Florian
AU - Hugi, Andreas
AU - Mangold, Markus
N1 - Funding Information:
We acknowledge A. Foltynowicz for sharing her unpublished CH 4 line list to support our analysis. M. Lepère is acknowledging support from “Fonds de la Recherche Scientifique (F.R.S.-FNRS)”. B. Vispoel acknowledges the F.R.S-FNRS for the post-doctoral support. IRsweep acknowledges funding for this project from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 101032761.
Funding Information:
Jakob Hayden reports financial support was provided by European Union. Bastien Vispoel reports financial support was provided by Fund for Scientific Research. Muriel Lepere reports financial support was provided by Fund for Scientific Research.
Publisher Copyright:
© 2022
PY - 2022/9
Y1 - 2022/9
N2 - To meet the challenges of high-resolution molecular spectroscopy, increasingly sophisticated spectroscopic techniques were developed. For a long time FTIR and laser-based spectroscopies were used for these studies. The recent development of dual-comb spectroscopy at high-resolution makes this technique a powerful tool for gas phase studies. We report on the use and characterization of the IRis-F1, a tabletop mid-infrared dual-comb spectrometer, in the newly developed step-sweep mode. The resolution of the wavenumber axis is increased by step-wise tuning (interleaving) and accurate measurement of the laser center wavelength and repetition frequency. Doppler limited measurements of N2O and CH4 reveal a wavenumber accuracy of 10−4 cm−1 on the covered range of > 50 cm−1. Measured half-widths of absorption lines show no systematic broadening, indicating a negligible instrument response function. Finally, measurements of nitrogen pressure broadening coefficients in the ν4 band of methane show that quantum cascade laser dual-comb spectroscopy in step-sweep mode is well adapted for measurements of precision spectroscopic data, in particular line shape parameters.
AB - To meet the challenges of high-resolution molecular spectroscopy, increasingly sophisticated spectroscopic techniques were developed. For a long time FTIR and laser-based spectroscopies were used for these studies. The recent development of dual-comb spectroscopy at high-resolution makes this technique a powerful tool for gas phase studies. We report on the use and characterization of the IRis-F1, a tabletop mid-infrared dual-comb spectrometer, in the newly developed step-sweep mode. The resolution of the wavenumber axis is increased by step-wise tuning (interleaving) and accurate measurement of the laser center wavelength and repetition frequency. Doppler limited measurements of N2O and CH4 reveal a wavenumber accuracy of 10−4 cm−1 on the covered range of > 50 cm−1. Measured half-widths of absorption lines show no systematic broadening, indicating a negligible instrument response function. Finally, measurements of nitrogen pressure broadening coefficients in the ν4 band of methane show that quantum cascade laser dual-comb spectroscopy in step-sweep mode is well adapted for measurements of precision spectroscopic data, in particular line shape parameters.
KW - High-resolution dual-comb spectroscopy
KW - Mid-infrared
KW - N2-collisional broadening of methane lines
KW - Quantum cascade laser frequency comb
UR - http://www.scopus.com/inward/record.url?scp=85129725384&partnerID=8YFLogxK
U2 - 10.1016/j.jqsrt.2022.108239
DO - 10.1016/j.jqsrt.2022.108239
M3 - Article
SN - 0022-4073
VL - 287
SP - 108239
JO - Journal of Quantitative Spectroscopy and Radiative Transfer
JF - Journal of Quantitative Spectroscopy and Radiative Transfer
M1 - 108239
ER -