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A dual-comb spectrometer for trace gas analysis in the mid-infrared

: Nitzsche, Leonard; Goldschmidt, Jens; Kießling, Jens; Wolf, Sebastian; Kühnemann, Frank; Wöllenstein, Jürgen

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Erstellt am: 16.4.2021

Schunemann, Peter G. (Hrsg.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nonlinear Frequency Generation and Conversion: Materials and Devices XX : 6-12 March 2021, Online Only, California, United States
Bellingham, WA: SPIE, 2021 (Proceedings of SPIE 11670)
Paper 1167005, 6 S.
Conference "Nonlinear Frequency Generation and Conversion - Materials and Devices" <20, 2021, Online>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IPM ()
frequency comb; spectrometer; trace gas

A dual frequency comb spectrometer is realized by electro-optic modulation of a 1550 nm laser and subsequent conversion to the mid-infrared by difference-frequency generation (DFG). Using an optical parametric oscillator for the DFG the combs can be tuned from 3 μm to 4.7 μm with 440 comb modes covering 220 GHz (< 6 cm-1). Trace gas detection of nitrous oxide, carbon dioxide and methane is demonstrated with a 7.2-m-multi-pass cell while a sufficiently low noise-equivalent absorbance is reached in already 1 s. The bandwidth normalized noise-equivalent-absorption coefficient is consistently below 2.8 × 10-6 Hz-1/2 cm-1 while the precision of the determined concentrations is better 2 % Hz-1/2.