Many-body and nonequilibrium effects on relaxation oscillations in a quantum-dot microcavity laser

作者：Lingnau Benjamin^*; Luedge Kathy; Schoell Eckehard; Chow Weng W

来源：Applied Physics Letters, 2010, 97(11): 111102.

DOI：10.1063/1.3488004

We investigate many-body and nonequilibrium effects on the dynamical behavior of a quantum-dot laser diode. Simulations, based on the Maxwell-semiconductor-Bloch equations, show strong dependence of the turn-on delay on initial cavity detuning, because of a dynamical shift in the quantum-dot distribution caused by band gap renormalization. Gain switch behavior is found to be insensitive to inhomogeneous broadening, because the balancing between many-body and free-carrier effects inhibits a cavity resonance walk-off. Both the relaxation oscillation damping and frequency are found to increase with decreasing inhomogeneous broadening widths. However, in contrast to bulk and quantum-well lasers, oscillation damping increases less than the frequency.

• 出版日期2010-9-13