Record high characteristic temperature ( T o = 122 K)of 1.55 µm strain-compensated AlGaInAs/AlGaInAs MQW lasers withAlAs/AlInAs multiquantum barrier

A record high characteristic temperature of 122 K (at 25–85°C) has been achieved in 1.55 µm strain-compensated AlGaInAs/AlGaInAs MQW lasers. A superlattice AlAs/AlInAs multiquantum barrier was used in the first successful realisation of long wavelength lasers. The threshold current density of the 50 µm-wide broad area 310 µm-long laser with cleaved facets is 1.1 kA/cm2 at 2°C. The slope efficiency decrease was only 9.5% from 25 to 85°C.