Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 5: Semiconductor Lasers

HL 5.10: Talk

Monday, March 12, 2018, 12:00–12:15, EW 202

Injection forced Polarization Switching in Bimodal Quantum Dot Micropillar Lasers — •Elisabeth Schlottmann¹, Felix Krüger¹, Benjamin Lingnau², David Schicke², Steffen Holzinger¹, Christian Schneider³, Martin Kamp³, Sven Höfling³, Xavier Porte¹, Kathy Lüdge², and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, Germany — ²Institut für Theoretische Physik, Technische Universität Berlin, Germany — ³Technische Physik, Julius-Maximilians-Universität Würzburg, Germany

Quantum Dot Micropillar lasers are fascinating devices that show an enhanced spontaneous emission in the lasing mode (high β-factor) and a correspondingly low laser threshold. Moreover, the fundamental laser mode is splitted into two orthogonally polarized modes. As they share the gain medium, gain competition leads to stable laser emission in either one of the modes or stochastic polarization switching (C. Redlich et al. New J. Phys. 18, 63011 (2016)).

Here, we tailor polarization switching in a QD-micropillar laser via optical injection into the non-lasing mode. For low injection powers, a non-switching micropillar laser strongly fluctuates. Increased injection power stabilizes the intrinsically non-lasing mode and pushes it to lasing with simultaneous suppression of the other mode. These effects are characterized with high-resolution spectral and correlation measurements.