We have fabricated InGaAs-InGaAlAs-InP strained quantum well lasers with wa
velength as long as 2.12 mu m in solid-source molecular-beam epitaxy. A con
tinuous-wave threshold current density of 780 A/cm(2) at room temperature a
nd a characteristic temperature of 48 K have been achieved. (C) 2000 Americ
an Institute of Physics. [S0003-6951(00)04834-8].