Dynamical properties of spin-polarized lasers

Abstract

This bachelor thesis deals with dynamical properties of spin-polarized lasers. Because of promising high light polarization control performance, their light polarization dynamics is extensively studied. It can be done using 4-level simplified Maxwell-Bloch equations. Real spin-polarized semiconductor lasers posses complicated V(E)CSEL(Vertical-(External) Cavity Surface-Emitting Laser) geometries which additionally contain local optical anisotropies. Thus, precise modeling of dynamics is difficult and it is beyond the scope of this work to include anisotropies. Spin-laser’s resonant cavities consist of Bragg reflectors, which are modeled theoretically in this thesis. Furthermore, the ellipsometric measurement of GaAs/AlAs Bragg reflector is presented. In order to solve simplified Maxwell-Bloch equations and analyze spin-laser’s dynamics, one has to evaluate losses of resonant cavity, because it is an important factor defining dynamics. It was done using the connection of losses to resonator’s spectral response profile which is based on Fourier analysis. Results are then discussed.