Abstract

We demonstrate quantum dot (QD) based continuous-wave photonic crystal (PhC) nanocavity laser operates at room temperature with a very low effective threshold power of ~ 375 nW. The continuous-wave lasing was achieved at 1.3 μm with InAs/GaAs self-assembled QDs and high quality PhC nanocavity with a quality factor of 87,000. The light-in versus light-out curve shows no sharp threshold unlike conventional lasers with pronounced kinks around the thresholds. This near-thresholdless behavior with smooth transition from thermal to coherent light region indicates that this nanocavity laser has a very high spontaneous emission coupling efficiency. The temporal coherence of such a high-β laser was studied by interference measurements. We also discuss the characteristics of background noise of QD based PhC nanocavity lasers compared with quantum well based PhC nanocavity lasers.

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