A model of the active region of a quantum well cascade laser (QCL) subjected to an externally applied magnetic field is presented, based on a solution of the coupled rate equations, assuming unity injection. Landau quantization induced by magnetic confinement imposes a need for a modification of the well-established active region model in order to accurately describe the processes occurring in an entirely discrete spectrum. Landau level (LL) configuration has major consequences for scattering processes, enhancing or inhibiting them depending on the inter-LL energy separation, and strongly modifies the population inversion and optical gain that can be estimated from the presented model. Numerical calculations were performed for a GaAs/AlGaAs QCL emitting at λ = 11.4 μm in a magnetic field of 10-60 T.
|Number of pages||5|
|Journal||Physica Status Solidi (B) Basic Research|
|Early online date||1 Jul 2005|
|Publication status||Published - 1 Jul 2005|
|Event||XVII Latin American Symposium on Solid State Physics - La Habana, Cuba|
Duration: 6 Dec 2004 → 9 Dec 2004
Conference number: 17