Speaker
Michael Jaidl
Description
We present ring-shaped THz Quantum Cascade lasers operating in four different emission regimes, including single-mode, harmonic state, dense comb, and chaotic multimode emission. The dense comb regime exhibits over 30 equidistant modes covering a bandwidth of 622 GHz. A single and narrow beat note at the roundtrip frequency is indicating comb formation. Our experimental results are explained accurately by a numerical model based on the Maxwell-Bloch formalism including the concept of the so-called linewidth enhancement factor, which describes the change of the refractive index induced by the modulations of the optical gain.
Primary author
Michael Jaidl
Co-authors
Nikola Opacak
(Technical University of Vienna)
Martin Alexander Kainz
Sebastian Schönhuber
Dominik Theiner
(TU Wien)
Benedikt Limbacher
(TU Wien)
Maximilian Beiser
(TU Wien)
Miriam Giparakis
Aaron Maxwell Andrews
(Institute of Solid State Electronics E362, TU Wien)
Gottfried Strasser
(TU Wien)
Benedikt Schwarz
(Institute of Solid State Electronics, TU Wien)
Juraj Darmo
(TU Wien)
Karl Unterrainer
(TU Wien)
