Low threshold room temperature AlGaAs/GaAs graded-index separate-confi
nement heterostructure single quantum well (GRIN SCH SQW) lasers were
prepared by MBE. The influence of the growth temperature on the laser
parameters was studied. Due to the high temperature MBE growth and the
use of p-contact layer in the form of thin quasi-metallic beryllium l
ayer significant reduction of the threshold current was achieved.