A Quantum Cascade Laser Dual-comb Spectrometer In Step-sweep Mode For High-resolution Molecular Spectroscopy

Mangold, Markus

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https://hdl.handle.net/2142/116945 Copy

Description

Title

A Quantum Cascade Laser Dual-comb Spectrometer In Step-sweep Mode For High-resolution Molecular Spectroscopy

Author(s)

Mangold, Markus

Contributor(s)

• Browet, Olivier
• Hugi, Andreas
• Hayden, Jakob
• Allmendinger, Pitt
• Lepère, Muriel
• Vispoel, Bastien
• Clément, Jean

Issue Date

2022-06-24

Keyword(s)

Lineshapes, collisional effects

Abstract

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 N$_2$O and CH$_4$ reveal a wavenumber accuracy of 10$^{-4}$ \wn~on the complete covered range of 50 \wn. 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 \nub{4} band of methane show that the dual-comb spectrometer in step-sweep mode is well adapted for measurements of precision spectroscopic data, in particular line shape parameters.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116945

DOI

https://doi.org/10.15278/isms.2022.FE01

Copyright and License Information

Copyright 2022 held by the authors

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