Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 36: Focussed Session: Frontiers in Laser Diode Physics I
HL 36.5: Talk
Thursday, March 15, 2018, 11:00–11:15, EW 202
Time dependent correlation dynamics and stochastical bifurcations in high-β quantum-dot mircopillar lasers — •Christoph Redlich, Benjamin Lingnau, and Kathy Lüdge — Institut für theoretische Physik, TU Berlin
We theoretically investigate semiconductor quantum-dot (QD) micropillar lasers with respect to the dynamics of their photon statistics and correlation functions. Semiconductor micropillar lasers show a two mode polarization degeneracy and high spontaneous emission noise (β-factor). This combination yields a strong mode interaction via the common gain medium and consequently, these lasers can show frequent mode switching and super-thermal emission characteristics.
During dynamic relaxation processes that occur far from thermodynamic equilibrium e.g. after optical perturbations or turn-ons, the second order correlation function g(2)(0) can yield valuable information about the laser behavior.
We describe the emission dynamics of the laser with a simple semi-classical model that contains a Langevin noise source for spontaneous emission. Using the ergodicity of the system, time-dependent intensity correlation functions can be evaluated by means of the variations from an ensemble of noise realizations. In contrast to fully quantum mechanical evaluation of g(2), we do not need a fully quantized approach to calculate these correlations. Particularly interesting are cases of relaxation oscillations or mode switching where we find strong oscillations in g(2)(0).