Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 18: Semiconductor Lasers II

HL 18.6: Vortrag

Montag, 20. März 2017, 16:30–16:45, POT 06

Stability in Optically Injected Two-State Quantum Dot Lasers — •Stefan Meinecke, Benjamin Lingnau, André Röhm, and Kathy Lüdge — Technische Universtität Berlin, Berlin, Germany

Semiconductor lasers based upon self-assembled quantum-dots (QDs) are promising sources for applications in optical networks used e.g. for data transmission via optical fibers. Recently, their ability to show simultaneous two-state lasing became the focus of diverse investigations.

We theoretically study a two-state quantum-dot laser subjected to optical injection into the ground state from a master laser. Our modeling approach is based on microscopically based rate-equations and goes beyond the constant alpha-factor approximation by including carrier dependent frequency shifts obtained from a full Bloch-equation approach.

Our results nicely reproduce recent experimental results on optical bistability. Furthermore, we show an increase of the dynamical stability of the two-state QD laser if compared to a single-color QD laser. We find that the chaotic dynamics, predicted for single-color QD lasers under strong and detuned injection, completely vanish, if excited state lasing is possible [1]. This phenomenon is surprising, as an increase in the dynamical complexity, i.e. the degrees of freedom, leads to a stabilization of the device.

[1] S. Meinecke, B. Lingnau, A. Röhm, K. Lüdge, Ann. d. Physik (2017)