Room-temperature lasing of quantum-dot pillar lasers

Micropillar cavity lasers demonstrate operation up to 255 K. At this temperature, the laser threshold and the bare Q-factor for a 4 μm diameter pillar are about 2 mW and 16800. For pillar lasers, the concept of which is based on an optical aperture, lasing is realized at room temperature. For a 15 μm diameter pillar with an aperture of 4 μm, single-mode lasing at a wavelength of 959 nm with a threshold power of about 14 mW is demonstrated.