Lasing in high-Q quantum-dot micropillar cavities

摘要

We present lasing in optically pumped high-Q micropillar cavity lasers with low thresholds and high β factors. The micropillar cavities with diameters between 1.0 and 4.0 μm contain a single layer of low density In_(0.3)Ga_(0.7)As quantum dots as active region. Cavity Q factors of up to 23.000 for 4.0 μm micropillar cavities and lasing based on less than 70 quantum dots is demonstrated.