Photo-acoustic dual-frequency comb spectroscopy
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2020
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| _version_ | 1866909079662755840 |
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| author | Wildi, Thibault Voumard, Thibault Brasch, Victor Yilmaz, Gürkan Herr, Tobias |
| author_facet | Wildi, Thibault Voumard, Thibault Brasch, Victor Yilmaz, Gürkan Herr, Tobias |
| contents | Photo-acoustic spectroscopy (PAS) is one of the most sensitive non-destructive analysis techniques for gases, fluids and solids. It can operate background-free at any wavelength and is applicable to microscopic and even non-transparent samples. Extension of PAS to broadband wavelength coverage is a powerful tool, though challenging to implement without sacrifice of wavelength resolution and acquisition speed. Here, we show that the unmatched precision, speed and wavelength coverage of dual-frequency comb spectroscopy (DCS) can be combined with the advantages of photo-acoustic detection. Acoustic wave interferograms are generated in the sample by dual-comb absorption and detected by a microphone. As an example, weak gas absorption features are precisely and rapidly sampled; long-term coherent averaging further increases the sensitivity. This novel approach of photo-acoustic dual-frequency comb spectroscopy generates unprecedented opportunities for rapid and sensitive multi-species molecular analysis across all wavelengths of light. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2004_04691 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Photo-acoustic dual-frequency comb spectroscopy Wildi, Thibault Voumard, Thibault Brasch, Victor Yilmaz, Gürkan Herr, Tobias Optics Chemical Physics Photo-acoustic spectroscopy (PAS) is one of the most sensitive non-destructive analysis techniques for gases, fluids and solids. It can operate background-free at any wavelength and is applicable to microscopic and even non-transparent samples. Extension of PAS to broadband wavelength coverage is a powerful tool, though challenging to implement without sacrifice of wavelength resolution and acquisition speed. Here, we show that the unmatched precision, speed and wavelength coverage of dual-frequency comb spectroscopy (DCS) can be combined with the advantages of photo-acoustic detection. Acoustic wave interferograms are generated in the sample by dual-comb absorption and detected by a microphone. As an example, weak gas absorption features are precisely and rapidly sampled; long-term coherent averaging further increases the sensitivity. This novel approach of photo-acoustic dual-frequency comb spectroscopy generates unprecedented opportunities for rapid and sensitive multi-species molecular analysis across all wavelengths of light. |
| title | Photo-acoustic dual-frequency comb spectroscopy |
| topic | Optics Chemical Physics |
| url | https://arxiv.org/abs/2004.04691 |