论文标题
通过非线性干涉测量法，使用短波IR光子计数检测器在中期IR中的甲烷传感
Methane sensing in the mid-IR using short wave IR photon counting detectors via non-linear interferometry
论文作者
论文摘要
我们通过使用非线性干涉测量法证明了一种新型的Mir甲烷传感器转移测量波长（1.55 $ $ M）。该技术利用泵，信号和惰轮模式在三波混合中看到的干扰效应，使双通过非线性晶体。该方法允许在检测器较差（$> $ 3 $ $ m）的波长下传感，并在可以实现光子计数灵敏度的波长下检测。在第一次实验演示中，我们以高精度测量了气体内部的甲烷浓度很小。该干涉仪可以在紧凑的设计中建造，以用于现场操作，并有可能在100m范围内检测到低浓度的甲烷。信噪比计算表明，该方法可以胜过现有的短波长（$ \ sim $ 1.65 $ $ $ m）集成路径差分吸收直接在高（$> $> $> $> $ 10^{ - 4} $）的非线性增益。
We demonstrate a novel MIR methane sensor shifting measurement wavelength to SWIR (1.55$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.
