Photo-acoustic dual-frequency comb spectroscopy
Abstract
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 dual-frequency comb spectroscopy (DCS) and its potential for unmatched precision, speed and wavelength coverage 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 dual-frequency comb photo-acoustic spectroscopy (DCPAS) generates unprecedented opportunities for rapid and sensitive multi-species molecular analysis across all wavelengths of light.
- Publication:
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Nature Communications
- Pub Date:
- August 2020
- DOI:
- 10.1038/s41467-020-17908-9
- arXiv:
- arXiv:2004.04691
- Bibcode:
- 2020NatCo..11.4164W
- Keywords:
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- Physics - Optics;
- Physics - Chemical Physics
- E-Print:
- Nat Commun 11, 4164 (2020)