Low threshold, room temperature superlattice-based (/spl lambda//spl sim/7.3 /spl mu/m) quantum cascade lasers by gas-source molecular beam epitaxy

Summary form only given. In order to produce an intersubband laser emitting near 7.3 /spl mu/m, we started by modeling the active and injector regions using Schrodinger´s equation. A schematic of this Ga/sub 0.47/In/sub 0.53/As/Al/sub 0.48/In/sub 0.52/As /spl lambda//spl sim/8 /spl mu/m superlattice-based quantum cascade laser (SLQCL) active region surrounded by two injector regions is presented. The simulation is performed assuming room temperature operation (300 K) at 45 kV/cm. The predicted emission wavelength is 7.25 /spl mu/m. A chirped superlattice is used as a basis for both active region and injector in order to take advantage of miniband transport and dispersion.