Dynamics of the Energy Relaxation in a Parabolic Quantum Well Laser
Abstract
We explore two parabolic quantum well (PQW) samples, with and without Bragg mirrors, in order to optimise the building blocks of a Bosonic Cascade Laser. The photoluminescence spectra of a PQW microcavity sample is compared against that of a conventional microcavity with embedded quantum wells (QWs) to demonstrate that the weak coupling lasing in a PQW sample can be achieved. The relaxation dynamics in a conventional QW microcavity and in the PQW microcavity was studied by a non-resonant pump-pump excitation method. Strong difference in the relaxation characteristics between the two samples was found. The semi-classical Boltzmann equations were adapted to reproduce the evolution of excitonic populations within the PQW as a function of the pump power and the output intensity evolution as a function of the pump-pump pulse delay. Fitting the PQW data confirms the anticipated cascade relaxation, paving the way for such a system to produce terahertz radiation.
Keywords
Cite
@article{arxiv.1507.08870,
title = {Dynamics of the Energy Relaxation in a Parabolic Quantum Well Laser},
author = {A. V. Trifonov and E. D. Cherotchenko and J. L. Carthy and I. V. Ignatiev and A. Tzimis and S. Tsintzos and Z. Hatzopoulos and P. G. Savvidis and A. V. Kavokin},
journal= {arXiv preprint arXiv:1507.08870},
year = {2016}
}
Comments
8 pages, 6 figures