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Humboldt-Universität zu Berlin - Faculty of Mathematics and Natural Sciences - Department of Physics

Humboldt-Universität zu Berlin | Faculty of Mathematics and Natural Sciences | Department of Physics | Colloquium | Colloquia | Department Colloquium: Prof. Dr. Jérôme Faist (Institute for Quantum Electronics, ETH Zürich)

Department Colloquium: Prof. Dr. Jérôme Faist (Institute for Quantum Electronics, ETH Zürich)

Lecture on: "Quantum cascade laser frequency combs: physics and applications"
When Jun 19, 2018 from 03:15 to 05:00 (Europe/Berlin / UTC200) iCal
Where Lise-Meitner-Haus, Christian-Gerthsen-Hörsaal, Newtonstraße 15, 12489 Berlin

Department Colloquium: Prof. Dr. Jérôme Faist (Institute for Quantum Electronics, ETH Zürich) will speak about "Quantum cascade laser frequency combs: physics and applications".

Abstract

The quantum cascade laser has recently been shown to operate as an optical frequency comb in both the mid-infrared and terahertz frequency range. We recently demonstrated a comb device delivering 1 watt of optical power over a bandwidth of more than 100cm-1 at 8µm wavelength. While the general origin of the comb formation in these devices is relatively well understood, the precise nature of the comb state and especially the relative phases of the modes are still under debate.

After an introduction on these devices and their applications for dual-comb spectroscopy, we report on new experiments pointing to the existence of a very special state of the comb, where the instantaneous frequency chirps linearly time over the length of a cavity round-trip period.