GaInAsSb-AlGaAsSb tapered lasers emitting at 2.05 μm with 0.6-W diffraction-limited power

Tapered lasers fabricated from a GaInAsSb-AlGaAsSb single-quantum-well structure are reported. The laser structure, grown by molecular beam epitaxy, has broad-stripe pulsed threshold current densities as low as 50 A/cm/sup 2/ at room temperature. Tapered lasers have exhibited diffraction-limited continuous-wave output power up to 600 mW.