Under CopyrightLindner, ChiaraChiaraLindnerWolf, SebastianSebastianWolfKießling, JensJensKießlingKühnemann, FrankFrankKühnemann2022-03-1410.3.20202020https://publica.fraunhofer.de/handle/publica/40695710.24406/publica-r-40695710.1117/12.2545883Mid-Infrared spectroscopy is one of the most important techniques in chemical analysis. However, the detectors for the mid-infrared range suffer from lower specific detectivities in comparison to their visible counterparts, cost more and often require cryogenic cooling. Nonlinear interferometers allow measuring mid-infrared spectra by detecting visible light using the induced coherence effect. In our work, we realize a nonlinear interferometer designed for broadband mid-infrared spectra with high resolution, which is easily tuneable, and in analogy to classical Fourier transform infrared (FTIR) spectrometers requires no additional spectral selection.eninfrared spectroscopyquantum opticsfourier transformParametric Down-ConversionNonlinear Interferometer621conference paper