Related papers: Methane sensing in the mid-IR using short wave IR photon counting detectors via non-linear interferometry

Methane sensing in the mid-IR using short wave IR photon counting detectors via non-linear interferometry

URL: http://arxiv.org/abs/2209.15289v2
Date: Tue, 21 May 2024 17:06:53 GMT
Title: Methane sensing in the mid-IR using short wave IR photon counting detectors via non-linear interferometry
Authors: Arthur C. Cardoso, Jinghan Dong, Haichen Zhou, Siddarth K. Joshi, John G. Rarity,
Abstract summary: We demonstrate a novel MIR methane sensor shifting measurement wavelength to SWIR (1.55$mu$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.
Score: 0.0699049312989311
License: http://creativecommons.org/licenses/by/4.0/
Abstract: We demonstrate a novel MIR methane sensor shifting measurement wavelength to SWIR (1.55$\mu$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 ($>$3$\mu$m) and detection at wavelengths where photon counting sensitivity can be achieved. In a first experimental demonstration, we measured a small methane concentration inside a gas cell with high precision. This interferometer can be built in a compact design for field operations and potentially enable the detection of low concentrations of methane at up to 100m range. Signal-to-noise ratio calculations show that the method can outperform existing short wavelength ($\sim$1.65$\mu$m) integrated path differential absorption direct sensing at high ($>$$10^{-4}$) non-linear gain.

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