Quantum dot micropillar lasers

We report on laser emission from high quality quantum dot micropillar cavities. In these structures cavity quantum electrodynamics (cQED) effects are exploited to realize high efficient, low threshold lasing. We demonstrate that cQED effects allow for the observation of low threshold laser emission from a low number of InGaAs quantum dots embedded in optically and electrically pumped high-Q micropillar laser structures. For instance, lasing with threshold currents as low as 4 µA (160 A/cm²) is observed for electrically pumped microlasers at cryogenic temperatures. Moreover, single quantum dot controlled lasing effects are achieved in optically pumped micropillar lasers with particular high quality factors.