A mid-infrared dual-comb spectrometer in step-sweep mode for high-resolution molecular spectroscopy
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909127911931904 |
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| author | Lepère, Muriel Browet, Olivier Clément, Jean Vispoel, Bastien Allmendinger, Pitt Hayden, Jakob Eigenmann, Florian Hugi, Andreas Mangold, Markus |
| author_facet | Lepère, Muriel Browet, Olivier Clément, Jean Vispoel, Bastien Allmendinger, Pitt Hayden, Jakob Eigenmann, Florian Hugi, Andreas Mangold, Markus |
| contents | 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 1E-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 v4 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_02720 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A mid-infrared dual-comb spectrometer in step-sweep mode for high-resolution molecular spectroscopy Lepère, Muriel Browet, Olivier Clément, Jean Vispoel, Bastien Allmendinger, Pitt Hayden, Jakob Eigenmann, Florian Hugi, Andreas Mangold, Markus Optics Instrumentation and Detectors 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 1E-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 v4 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. |
| title | A mid-infrared dual-comb spectrometer in step-sweep mode for high-resolution molecular spectroscopy |
| topic | Optics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2403.02720 |