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

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

We demonstrate a novel MIR methane sensor shifting measurement wavelength to SWIR (1.55μm) 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 (>3μm) 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 (∼1.65μm) integrated path differential absorption direct sensing at high (>10−4) non-linear gain.
Original languageEnglish
Article number524280
Pages (from-to)823-832
Number of pages10
JournalOptics Continuum
Volume3
Issue number5
DOIs
Publication statusPublished - 15 May 2024

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