Quantum cascade lasers using double quantum well superlattices

We have demonstrated the feasibility of using double quantum well superlattices as the active region of a quantum cascade (QC) laser. The features of the new design allow for much greater flexibility than previous SL QC lasers opening the possibility for new laser designs. For example, we could create an "injector-less" quantum cascade structure. The elimination of the injector region increases the overlap of the mode intensity profile with the active material while also increasing the number of active layers that can fit within a given waveguide core. This would lower the threshold and increase the output power compared to a laser requiring injectors.