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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2022
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| Online-Zugang: | https://arxiv.org/abs/2209.15289 |
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| _version_ | 1866909207373021184 |
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| author | Cardoso, Arthur C. Dong, Jinghan Zhou, Haichen Joshi, Siddarth K. Rarity, John G. |
| author_facet | Cardoso, Arthur C. Dong, Jinghan Zhou, Haichen Joshi, Siddarth K. Rarity, John G. |
| contents | We demonstrate a novel MIR methane sensor shifting measurement wavelength to SWIR (1.55$μ$m) by using non-linear interferometry. The technique exploits the interference effects seen in three-wave mixing when pump, signal, and idler modes make a double pass through a nonlinear crystal. The method allows sensing at wavelengths where detectors are poor ($>$3$μ$m) and detection at wavelengths where photon counting sensitivity can be achieved. In a first experimental demonstration, we measured a small methane concentration inside a gas cell with high precision. This interferometer can be built in a compact design for field operations and potentially enable the detection of low concentrations of methane at up to 100m range. Signal-to-noise ratio calculations show that the method can outperform existing short wavelength ($\sim$1.65$μ$m) integrated path differential absorption direct sensing at high ($>$$10^{-4}$) non-linear gain. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2209_15289 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Methane sensing in the mid-IR using short wave IR photon counting detectors via non-linear interferometry Cardoso, Arthur C. Dong, Jinghan Zhou, Haichen Joshi, Siddarth K. Rarity, John G. Quantum Physics Optics We demonstrate a novel MIR methane sensor shifting measurement wavelength to SWIR (1.55$μ$m) by using non-linear interferometry. The technique exploits the interference effects seen in three-wave mixing when pump, signal, and idler modes make a double pass through a nonlinear crystal. The method allows sensing at wavelengths where detectors are poor ($>$3$μ$m) and detection at wavelengths where photon counting sensitivity can be achieved. In a first experimental demonstration, we measured a small methane concentration inside a gas cell with high precision. This interferometer can be built in a compact design for field operations and potentially enable the detection of low concentrations of methane at up to 100m range. Signal-to-noise ratio calculations show that the method can outperform existing short wavelength ($\sim$1.65$μ$m) integrated path differential absorption direct sensing at high ($>$$10^{-4}$) non-linear gain. |
| title | Methane sensing in the mid-IR using short wave IR photon counting detectors via non-linear interferometry |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2209.15289 |