Mid-IR spectroscopy with NIR grating spectrometers

• URL: http://arxiv.org/abs/2109.11269v1
• Date: Thu, 23 Sep 2021 10:12:31 GMT
• Title: Mid-IR spectroscopy with NIR grating spectrometers
• Authors: Paul Kaufmann (1), Helen M. Chrzanowski (1), Aron Vanselow (2), Sven Ramelow (1 and 3) ((1) Humboldt-Universit\"at zu Berlin, Berlin, Germany, (2) L'\'Ecole Normale Superieure, Paris, France, (3) IRIS Adlershof, Berlin, Germany)
• Abstract summary: spectroscopy in the mid-IR using only a visible (VIS) solid-state laser and an off-the-shelf, commercial near-infrared (NIR) grating spectrometer. With this proof-of-concept implementation, covering a broad range from 3.2$mu$m to 4.4$mu$m, we access short integration times down to 1s and signal-to-noise ratios above 200 at a spectral resolution from 12cm$-1$ down to 1.5cm$-1$ for longer integration times.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Mid-infrared (mid-IR) spectroscopy is a crucial workhorse for a plethora of analytical applications and is suitable for diverse materials, including gases, polymers or biological tissue. However, this technologically significant wavelength regime between 2.5-10$\mu$m suffers from technical limitations primarily related to the large noise in mid-IR detectors and the complexity and cost of bright, broadband mid-IR light sources. Here, using highly non-degenerate, broadband photon pairs from bright spontaneous parametric down-conversion (SPDC) in a nonlinear interferometer, we circumvent these limitations and realise spectroscopy in the mid-IR using only a visible (VIS) solid-state laser and an off-the-shelf, commercial near-infrared (NIR) grating spectrometer. With this proof-of-concept implementation, covering a broad range from 3.2$\mu$m to 4.4$\mu$m, we access short integration times down to 1s and signal-to-noise ratios above 200 at a spectral resolution from 12cm$^{-1}$ down to 1.5cm$^{-1}$ for longer integration times. Through the analysis of polymer samples and the ambient CO$_2$ in our laboratory, we highlight the potential of this measurement technique for real-world applications.

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