Single quantum dot laser using photonic crystal nanocavity

We demonstrate laser oscillation in InAs/GaAs single quantum dot (SQD) and photonic crystal nanocavity coupled systems. The coupling SQD provides most of the gain and distinct SQD feature is observed in the photon statistics. Depending on the light-matter coupling strength, laser oscillation starts in the weak- or strong-coupling regime. It is significant that the polariton doublet is still observed at the threshold pump power in the strongly coupled system. This fact indicates that the coherent exchange of quanta between the SQD and the cavity is still sustained under laser oscillation in the intermediate state.