Fourier transform infrared spectroscopy with visible light

Abstract

Nonlinear interferometers allow spectroscopy in the mid-infrared range by detecting correlated visible light, for which non-cooled detectors with higher specific detectivity and lower dark count rates are available. We present a new approach for the registration of spectral information, which combines a nonlinear interferometer using non-degenerate spontaneous parametric down-conversion (SPDC) with a Fourier-transform spectroscopy concept. In order to increase the spectral coverage, we use broadband non-collinear SPDC in periodically poled LiNbO${}_3$. Without the need for spectrally selective detection, continuous spectra with a spectral bandwidth of more than 100cm${}^{-1}$ are achieved. We demonstrate transmission spectra of a polypropylene sample measured with ~ 6cm${}^{-1}$ resolution in the spectral range between 3.2$\mu$m to 3.9$\mu$m.

References in corpus (6)

• Frequency comb spectroscopy
• Quantum Imaging with Undetected Photons
• Infrared Spectroscopy with Visible Light
• Tunable Optical Coherence Tomography in the Infrared Range Using Visible Photons
• Measurement of infrared optical constants with visible photons
• Nonlinear infrared spectroscopy free from spectral selection

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