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Updated: Apr 13, 2026

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
Published on: September 22, 2017
Broadband comb spectroscopy through spectral envelope shaping
Ina Heckelmann1, Davide Pinto2, Uwe Schmitt3
1Institute of Quantum Electronics, Department of Physics, ETH Zürich, Zürich, Switzerland. iheckelmann@ethz.ch.
None:
Optical frequency combs have facilitated fast and compact multi-component chemical analysis due to their broad spectral bandwidth. Although dual-comb spectrometers are an established implementation of this technology, their design requires a pair of matched combs with high mutual coherence, making the system considerably complex. In this study, we propose and implement a rapid, compact and broadband spectroscopy technique that operates without moving components, leveraging the stability, controllability and speed of a single Quantum Wwalk Ccomb laser. By using a comb based on a Quantum Cascade Laser, emitting within the molecular fingerprint region of the mid-infrared spectrum, we build a non-interferometric setup for the targeted and non-targeted analysis of various organic solvent vapours. With a time resolution as small as 10 μs and a high dynamic range reaching three orders of magnitude in concentration, this approach is suitable for the real-time analysis of chemical kinetics.
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