Terahertz quantum cascade lasers operating above liquid nitrogen temperature

The development of quantum cascade lasers at 2.94 -3.10 THz are reported. The materials were prepared by Veeco GEN-II solid source molecular beam epitaxy and devices were processed using standard photolithography and wet chemical etching. Lasing is observed up to a heat-sink temperature of 80 K in pulsed mode with peak light power of 14 mW at 10 K and 2 mW at 80 K.