We have demonstrated a highly strained GaInAs/GaAs double quantum well lase
r operating at nearly 1.2 mu m with AlGaAs cladding layers for the first ti
me. Our previously reported high characteristic temperature of 150 K was im
proved to 202 K for a 410-mu m-long broad-area GaInAs/GaAs/AlGaAs laser in
the temperature range from 30 degrees C to 70 degrees C. The threshold curr
ent density of this laser was as low as 370 A/cm(2).