Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 58: [DS] Plasmonics and Nanophotonics (jointly with HL and O)
O 58.4: Talk
Wednesday, March 16, 2011, 18:00–18:15, GER 38
Analytical approach to modulation properties of quantum dot lasers — •Kathy Lüdge1, Evgeny Viktorov2, Thomas Erneux2, and Eckehard Schöll1 — 1Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — 2Universite Libre de Bruxelles, Optique Nonlineaire Theorique, Campus Plaine, C.P. 231, 1050 Bruxelles, Belgium
We analyze a microscopically based rate equation model for quantum dot lasers. The model separately treats the dynamics of electrons and holes, and the carrier-carrier scattering rates depend nonlinearly on the wetting layer carrier densities [1]. Our objective is to determine analytical expressions for the relaxation oscillation frequency and damping rate. To this end, we consider the Class B limit of the five rate equations and apply asymptotic techniques. We consider two cases corresponding to either equivalent or drastically different decay rates for the electrons and holes. We show how they contribute to increase the relaxation oscillation damping rate compared to the damping rate of the conventional laser and that there exist optimal conditions on the control parameters in order to observe maximum damping.
[1] K. Lüdge, E. Schöll, IEEE J.Quantum Electron. 45, 1396 (2009).