Single mode GaAs quantum cascade laser
We report on the realization of distributed feedback quantum cascade lasers in the AlGaAs/GaAs material system. The active material is designed as a chirped superlattice. Strong coupling is achieved by the use of a metallized surface relief grating, allowing the realization of short lasers. Further, the emission wavelength of the distributed feedback laser is continuously tunable according to the temperature dependence of the refractive index. Pulsed single mode emission at room temperature was achieved at 12.5 ?m.
quantum cascade lasers distributed feedback superlattice mid-infrared