Long-wave infrared Fourier transform spectroscopy with enhanced and scalable sensitivity
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910125569081344 |
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| author | Vasilyev, Sergey Krebbers, Roderik Konnov, Dmitrii Walsh, Mathieu Moskalev, Igor Mirov, Mike Muraviev, Andrey Genest, Jerome Vodopyanov, Konstantin Cristescu, Simona M. |
| author_facet | Vasilyev, Sergey Krebbers, Roderik Konnov, Dmitrii Walsh, Mathieu Moskalev, Igor Mirov, Mike Muraviev, Andrey Genest, Jerome Vodopyanov, Konstantin Cristescu, Simona M. |
| contents | We report a broadband long-wave infrared Fourier transform spectrometer with sensitivity exceeding that of previously reported direct-detection implementations. The system combines dual-comb spectroscopy with electro-optic sampling, multi-channel parallel near-infrared detection using InGaAs photodiodes, and real-time GPU-based computational corrections of multiple spectroscopy signals. Detection limits of 0.3 ppb for NH$_{3}$ and 2 ppb for C$_{2}$H$_{4}$ are achieved in 500 s, corresponding to 20x and 40x sensitivity improvements over earlier LWIR demonstrations, while maintaining high 0.0027 cm$^{-1}$ spectral resolution and broad spectral coverage. The architecture supports scalable sensitivity through increased detector count and enables rapid multispecies analysis of complex gas mixtures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_11622 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Long-wave infrared Fourier transform spectroscopy with enhanced and scalable sensitivity Vasilyev, Sergey Krebbers, Roderik Konnov, Dmitrii Walsh, Mathieu Moskalev, Igor Mirov, Mike Muraviev, Andrey Genest, Jerome Vodopyanov, Konstantin Cristescu, Simona M. Optics We report a broadband long-wave infrared Fourier transform spectrometer with sensitivity exceeding that of previously reported direct-detection implementations. The system combines dual-comb spectroscopy with electro-optic sampling, multi-channel parallel near-infrared detection using InGaAs photodiodes, and real-time GPU-based computational corrections of multiple spectroscopy signals. Detection limits of 0.3 ppb for NH$_{3}$ and 2 ppb for C$_{2}$H$_{4}$ are achieved in 500 s, corresponding to 20x and 40x sensitivity improvements over earlier LWIR demonstrations, while maintaining high 0.0027 cm$^{-1}$ spectral resolution and broad spectral coverage. The architecture supports scalable sensitivity through increased detector count and enables rapid multispecies analysis of complex gas mixtures. |
| title | Long-wave infrared Fourier transform spectroscopy with enhanced and scalable sensitivity |
| topic | Optics |
| url | https://arxiv.org/abs/2604.11622 |