Self-organized GaAs quantum-wire lasers grown on (775)B-oriented GaAs substrates by molecular beam epitaxy

Self-organized GaAs/(GaAs)4(AlAs)2 quantum-wire (QWR) lasers were grown on (775)B-oriented GaAs substrates by molecular-beam epitaxy. The QWRs were naturally formed at thick parts in the GaAs/(GaAs)4(AlAs)2 quantum well with a corrugated AlAs-on-GaAs upper interface and a flat GaAs-on-AlAs lower interface. The density of the QWRs was as high as 8×106 cm−1. Stripe-geometry lasers with the self-organized (775)B GaAs/(GaAs)4(AlAs)2 QWRs as an active region oscillated at 20 °C with threshold current densities of about 3 kA/cm2 for uncoated mirrors.