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HL: Fachverband Halbleiterphysik

HL 60: Focus Session: Coherent dynamics in semiconductor nanostructures and coupled devices

HL 60.2: Topical Talk

Mittwoch, 13. März 2013, 15:30–16:00, H16

Impact of coherent processes on the dynamics of quantum-dot lasers and amplifiers — •Kathy Lüdge — Institut für Theoretische Physik, Technische Universität Berlin, Deutschland

The coherent interaction between material polarization and light mode is discussed with respect to its impact on the dynamics of quantum-dot (QD) laser and amplifiers. We use a semiclassical Maxwell-Bloch approach to predict the dynamics of these devices and give further insights into the the interplay between structure and device performance. An essential part of the model is the systematic consideration of all Coulomb scattering processes. The predictive power of the model makes the results interesting for experimentalists as well as for the community engaged in QD modeling. It is found that the QD laser dynamics is considerably affected by the coherent processes if the laser is operated in a self pulsating regime, e.g., if subjected to optical injection or feedback. Further we show that the coherent interaction of the quantum dot states and the reservoir states has a huge impact on the phase dynamics and the chirp of ultrashort input pulses in amplifiers, making it important for high speed data transmission. For high input pulse intensities we observe a pulse breakup at the output facet of the amplifier that is due to pronounced Rabi oscillations of the QD polarization.