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Proceedings Paper

Many-body effects and self-contained phase dynamics in an optically injected quantum-dot laser
Author(s): Benjamin Lingnau; Kathy Lüdge; Weng W. Chow; Eckehard Schöll
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Paper Abstract

Quantum-dot (QD) lasers exhibit unique properties when subjected to optical injection, e.g. lower sensitivity and less complex dynamics when compared to conventional quantum-well (QW) lasers. These features can be explained by a lower phase-amplitude coupling and a higher damping of relaxation oscillations in QD laser devices. In this work, we investigate an optically injected QD laser and clarify the role of many-body effects. We model the QD laser device using a semi-classical approach based on the semiconductor-Bloch and Maxwell's equations. The QD optical transition is modeled with a finite spectral width, accounting for inhomogeneous broadening due to QD imperfections. Furthermore, many-body Coulomb interactions, leading to renormalizations of the single-particle energies, are taken into account assuming the screened Hartree-Fock approximation. Throughout the literature the phase dynamics of the electric field inside the laser cavity is implemented by assuming a constant α-factor. Our model accounts for the effects of α via a more rigorous treatment of light-semiconductor interaction. As a result the model allows to extract a value for the α-factor from the intrinsic phase dynamics of the system. The extracted α-factor is not a constant, but rather changes on the one hand dynamically throughout the simulations, and on the other hand with all operation conditions. Furthermore, the dynamical shift of the band-gap energy due to the Coulomb interactions gives rise to modifications in the locking behavior of the laser, that can not be explained with the simpler free-carrier models.

Paper Details

Date Published: 15 May 2012
PDF: 13 pages
Proc. SPIE 8432, Semiconductor Lasers and Laser Dynamics V, 84321J (15 May 2012); doi: 10.1117/12.921991
Show Author Affiliations
Benjamin Lingnau, Technische Univ. Berlin (Germany)
Kathy Lüdge, Technische Univ. Berlin (Germany)
Weng W. Chow, Sandia National Labs. (United States)
Eckehard Schöll, Technische Univ. Berlin (Germany)

Published in SPIE Proceedings Vol. 8432:
Semiconductor Lasers and Laser Dynamics V
Krassimir Panajotov; Marc Sciamanna; Angel Valle; Rainer Michalzik, Editor(s)

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