Quantum disk lasers with self-organized dot-like active regions

Although there have been controversial discussions about the validity of quantum dot lasers, few experimental results have been reported because of the difficulty of fabricating a quantum dot structure suitable for laser applications. Here we introduce a novel self-organization phenomenon that occurs in a strained InGaAs-AlGaAs system during the interrupted epitaxial growth on a GaAs (311)B substrate and that forms microcrystals with built-in quantum disks. We describe and discuss the performance of strained InGaAs quantum disk lasers with nanoscale active regions fabricated by self-organization phenomenon.