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Upconversion-enabled array spectrometer for the mid-infrared, featuring kilohertz spectra acquisition rates

: Wolf, Sebastian; Kießling, Jens; Kunz, Michael; Popko, Gregor; Buse, Karsten; Kühnemann, Frank

Fulltext (PDF; )

Optics Express 25 (2017), No.13, pp.14504-14515
ISSN: 1094-4087
Bundesministerium für Bildung und Forschung BMBF
16SV3682; MAVO
Journal Article, Electronic Publication
Fraunhofer EMI ()
Fraunhofer IPM ()
upconversion; spectrometers; spectroscopy; infrared; infrared spectroscopy

Mid-infrared spectroscopy is an essential analytical method in science and industry. Unlike in the near-infrared range, grating spectrometers for the mid-infrared are rarely employed, mostly due to the limited availability and performance of suitable line array detectors. In this work, continuous-wave nonlinear-optical upconversion is used to enable mid-infrared spectroscopy. A broad spectral window between 3.7 and 4.7 μm is upconverted to 825 – 867 nm for detection on a silicon-camera-based near-infrared grating spectrometer with a high sensitivity down to sub-picowatt of input power. A theoretical model is presented that accurately describes the upconversion process and the total system behavior. Spectroscopic flame emission measurements demonstrate the applicability towards the analysis of highly dynamic processes.