Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 88: Lasers
HL 88.1: Vortrag
Freitag, 18. März 2011, 10:15–10:30, POT 151
Effects of Many-Body Coulomb Effects on Injection-Locked Quantum Dot Lasers — •Benjamin Lingnau1, Kathy Lüdge1, Eckehard Schöll1, and Weng W. Chow2 — 1Institut f. Theo. Physik, Sekr. EW 7-1, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — 2Sandia National Laboratories, Albuquerque, New Mexico 87185-1086, USA
We simulate a single-mode quantum dot semiconductor laser device under the injection of an external optical signal into the laser cavity. For a certain range of parameters, the laser will be frequency-locked to the injected signal. In the past, many-body Coulomb effects were found to influence laser dynamics[1]. With our simulations, we now investigate how many-body Coulomb effects influence the locking behavior of the device, and the parameter range for which frequency locking occurs. The theory used in the simulations is based on a semiclassical approach, where the laser field and active medium are described by the Maxwell-semiconductor-Bloch equations. Many-body Coulomb effects are described within the screened Hartree-Fock approximation. Carrier-carrier and carrier-phonon collisions are treated within the effective relaxation rate approximation. Inhomogeneous broadenening of the quantum-dot distribution is taken into account.
[1] B. Lingnau, K. Lüdge, E. Schöll, and W. W. Chow, "Many-body and nonequilibrium effects on relaxation oscillations in a quantum-dot microcavity laser", Appl. Phys. Lett. 97, 111102 (2010)