High-temperature 4.5-μm type-II quantum-well laser with Auger suppression

Laser emission at 4.2-4.5 μm has been observed at temperatures up to 310 K in pulsed optical pumping experiments on type-II quantum-well (QW) lasers with four constituents in each period (InAs-Ga/sub 1-x/In/sub x/Sb-InAs-AlSb). The characteristic temperature, T
₀
, is 41 K, and a peak output power exceeding 2 W/facet is observed at 200 K. The power conversion efficiency per facet of /spl ap/0.2% up to 200 K is within a factor of 2 of the theoretical value. The 300 K Auger coefficient of 4×10/sup -27/ cm
⁶
/s extracted from the threshold pump intensity demonstrates that Auger losses have been suppressed by a factor of four.