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arXiv · 2011.09764

Nonlinear interferometer for Fourier-transform mid-infrared gas spectroscopy using near-infrared detection

Chiara Lindner·Jachin Kunz·Simon J. Herr·Sebastian Wolf·Jens Kiessling·Frank Kühnemann
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Abstract

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$\,\mu$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.

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Chiara Lindner, Jachin Kunz, Simon J. Herr, Sebastian Wolf, Jens Kiessling, Frank Kühnemann. 2020-11-19. Nonlinear interferometer for Fourier-transform mid-infrared gas spectroscopy using near-infrared detection. https://doi.org/10.1364/oe.415365

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