![]() ![]() Finally, we have theoretically investigated optically injected QD laser lasing simultaneously from the ground and excited states. We show that experimentally observed excitable pulses are complemented by self-pulsations resulting from the so-called bottleneck phenomenon. We have also carried out theoretical studies of optically injected QD lasers accounting for the intradot carrier dynamics through the higher-energy excited states. To our best knowledge this is the first observation of such a diversi?ed dynamics of polarization mode hopping in a single VCSEL. Within this region the average dwell time decreases by eight orders of magnitude from seconds to nanoseconds. Their characteristics are different from what is typically observed in their QW counterparts: light that is linearly polarized close to lasing threshold becomes elliptically polarized as current is increased and then a wide region of polarization mode hopping between nonorthogonal, elliptically polarized modes sets on. In this thesis we first show our experimental results on polarization instabilities in quantum dot (QD) lasers with vertical cavity, so called VCSELs.
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