论文标题
使用近红外检测
Nonlinear interferometer for Fourier-transform mid-infrared gas spectroscopy using near-infrared detection
论文作者
论文摘要
非线性干涉仪允许使用相关光子进行近红外检测的中红外光谱。先前的实现证明了通过频谱选择性检测有限的光谱分辨率。在我们的工作中，我们使用单像素近红外检测和傅立叶变换分析在非线性干涉仪中展示了中红外传输光谱。亚波频谱分辨率允许在700 $ \，$ cm $^{ - 1} $的光谱带宽中对旋转线解析光谱。我们在3.3 $ \，μ$ m波长左右使用甲烷传输光谱来表征设备的光谱分辨率，噪声限制和传输精度。非线性干涉法和傅立叶转换分析的组合为近红外检测铺平了朝着性能和有效的中红外光谱范围的道路。
Nonlinear interferometers allow for mid-infrared spectroscopy with near-infrared detection using correlated photons. Previous implementations have demonstrated a spectral resolution limited by spectrally selective detection. In our work, we demonstrate mid-infrared transmission spectroscopy in a nonlinear interferometer using single-pixel near-infrared detection and Fourier-transform analysis. A sub-wavenumber spectral resolution allows for rotational-line-resolving spectroscopy of gaseous samples in a spectral bandwidth of over 700$\,$cm$^{-1}$. We use methane transmission spectra around 3.3$\,μ$m wavelength to characterize the spectral resolution, noise limitations and transmission accuracy of our device. The combination of nonlinear interferometry and Fourier-transform analysis paves the way towards performant and efficient mid-infrared spectroscopy with near-infrared detection.
