Mixed disorder in GaAs/AlxGa1−xAs superlattices and its effect on the range of wavelength infrared lasers

By introducing a mixed disorder on GaAs/AlxGa1−xAs superlattices, a wide range of infrared (15–248 μm) was achieved. The studied systems consist of two different structures randomly distributed along the growth direction, with the additional constraint that the structure with height barrier V2 and thickness db2 appear only by doublet or triplet. The exact Airy – function formalism combined with a transfer matrix technique was used for evaluating the transmission probability and laser wavelength. The analysis of the proposed model shows that the far infrared wavelength is obtained when the aluminum mole fraction increase and mixed disorder is introduced by trimer.