Quantum cascade laser (QCL) frequency combs are well suited for mid-IR dual-comb spectroscopy at a spectral resolution on the few MHz (<10-4 cm-1) or even sub-MHz scale. By current- or temperature sweeping, gapless spectra covering > 60 cm-1 in the mid-infrared can be recorded in a few ms (“rapid-sweep” technique) or minutes (“step-sweep” technique), which makes the IRis-F1 dual-comb spectrometer a viable tool for high-resolution and high-speed infrared spectroscopy.
Previously, rapid-sweep spectra required calibration of the swept frequency axis based on the position of well-known absorption lines of gasses, limiting the accuracy of the frequency scale when the calibration was transferred to measurements taken later on.
More recently, the wavenumber accuracy with swept QCL frequency combs was drastically increased by measuring both, the repetition frequency and offset frequency of the sample comb directly during the measurement.
The webinar will focus on progress on high-resolution infrared spectroscopy with dual QCL frequency combs. The webinar will be hosted by Jakob Hayden, who will briefly introduce the high-resolution options of IRsweep’s IRis-F1 spectrometer. Our guest speakers Michele Gianella and Kenichi Komagata will introduce their experimental work on frequency-referenced QCL frequency combs and present dual-comb measurements in the n1 band of N2O with a frequency accuracy of 600 kHz.
The results presented in this webinar have been kindly supported by the European Commission H2020 Innovation Launchpad project RESPAC, #101034481.
13 May 2022 – 5:00 pm CET
Speakers
Jakob Hayden
Jakob Hayden received his PhD from TU Wien, Austria, in the group of Bernhard Lendl. He joined IRsweep in 2020 as an R&D and application engineer. Jakob is responsible for further developments and applications of the high-resolution options of the IRis-F1 spectrometer with support from a Marie-Sklodowska-Curie-fellowship.
Michele Gianella
Michele Gianella is currently a senior researcher at the Laboratory for Air Pollution / Environmental Technology lead by Lukas Emmenegger at Empa, Switzerland. He received his PhD from ETH Zurich in the group of Markus Sigrist. Michele worked as a PostDoc at ETH Zurich and was a Marie-Sklodowska-Curie fellow and PostDoc at the University of Oxford, UK, in the group of Grant Ritchie.
Kenichi N. Komagata
Kenichi N. Komagata is currently a third year PhD student under supervision of Prof. Thomas Südmeyer in the Laboratoire Temps-Fréquence, Université de Neuchâtel, Switzerland. He holds a Master’s degree in physics from EPFL Lausanne. For his PhD thesis, he investigates the stabilization of quantum cascade laser frequency combs with a focus on high-precision mid-infrared dual-comb spectroscopy.