Low-threshold lasers have been fabricated by impurity-induced disorder
ing using InGaAs/GaAs/AlGaAs double-quantum-well material. Threshold c
urrent as low as 1.0 mA under room-temperature continuous-wave operati
on was obtained for uncoated lasers. Experimental data show that this
low threshold is mainly due to the optimizations for both the QW desig
n and the device structures.