Tapered oscillators fabricated from a GaInAsSb-AlGaAsSb quantum-well s
tructure are reported for the first time. The quantum-well laser struc
ture, grown by molecular beam epitaxy, has broad-stripe pulsed thresho
ld current densities as low as 330 A/cm2 at room temperature. One tape
red laser emitting at 2.02 mum has exhibited continuous wave (CW) outp
ut power up to 750 mW, with power in the near-diffraction-limited cent
ral lobe as high as 200 mW.