High-power GaInAsSb-AlGaAsSb multiple-quantum-well diode lasers emitting at 1.9 μm

High-power diode lasers emitting at /spl sim/1.9 μm have been fabricated from a quantum-well heterostructure having an active region consisting of five GaInAsSb wells and six AlGaAsSb barriers. For devices 300 μm wide and 1000 μm long, single-ended output power as high as 1.3 W cw has been obtained with an initial differential quantum efficiency of 47%. The pulsed threshold current density is as low as 143 A/cm
²
for 2000-μm-long devices.