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

 
: Lindner, Chiara; Kunz, Jachin; Herr, Simon J.; Wolf, Sebastian; Kießling, Jens; Kühnemann, Frank

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Optics Express 29 (2021), Nr.3, S.4035-4047
ISSN: 1094-4087
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IPM ()
diode pumped laser; Fourier Transform Interferometry; Near Infrared Spetroscopy; optical coherence tomography; photon; visible light

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 μm 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.

: http://publica.fraunhofer.de/dokumente/N-621812.html