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QCL Dual‐Comb Spectroscopy Matures for Applications

Markus Geiser, Raphael Horvath and Jakob Hayden

Photonics Views; 2021

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Dual‐comb spectroscopy is a powerful direct absorption spectroscopy technique and has attracted considerable attention, with high precision spectroscopy applications being the most prominent since the invention of the frequency comb was awarded the 2005 Nobel Prize in physics. The application range is continuously broadening and here we review recent advances achieved with quantum cascade laser frequency comb spectrometers in process monitoring and reaction kinetics applications.