Vertical cavity lasers based on vertically coupled quantum dots

Ground state lasing is reported for vertical cavity lasers containing three-period InGaAs/GaAs vertically coupled quantum dot active regions. The structures include selectively oxidised AlO current apertures and AlO/GaAs reflectors. Experimental devices emitting near 1.0 µm operate continuous wave at 20°C with threshold currents <200 µA and peak power conversion efficiencies exceeding 10%.