Speaker
Hedwig Knötig
(TU Wien)
Description
We present our recent results on the impact of intersubband absorption in the valence band on the performance of interband cascade lasers (ICLs). We observe a clear performance dependence on the thickness and composition of the Ga$_{1-x}$In$_x$Sb hole-quantum well (QW), reflecting in the characteristic temperature $T_\mathrm{0}$ as well as the threshold current density $J_\mathrm{th}$. By careful design of the active W-QW the intersubband absorption in the valence band can be tailored and even completely avoided, allowing us to enhance ICL performance outside of the sweet spot 3-4 μm region, paving the way towards higher cw operating temperatures and output powers.
Primary authors
Hedwig Knötig
(TU Wien)
Robert Weih
(nanoplus Nanosystems and Technologies GmbH)
Nikola Opacak
(Technical University of Vienna)
Sven Höfling
(University of Würzburg)
Johannes Koeth
(nanoplus Nanosystems and Technologies GmbH)
Gottfried Strasser
(TU Wien)
Benedikt Schwarz
(TU Wien)
