cw room-temperature InxGa1−xAs/InyGa1−yP 1.06-μm lasers

Abstract
Room‐temperature cw laser operation at wavelengths between 1.06 and 1.12 μm has been obtained from double‐heterojunction structures of InxGa1−xAs/InyGa1−yP prepared by vapor‐phase epitaxy. These devices have pulsed threshold current densities as low as 1000 A/cm2 and external differential quantum efficiencies as high as 55%. Their active laser cavities are between 0.14 and 0.36 μm thick, providing fundamental transverse‐mode operation with far‐field patterns 50 to 60° wide.