Abstract
We present a model for calculating the optical gain in a midinfrared GaAs∕AlGaAs quantum cascade laser in a magnetic field, based on solving the set of rate equations that describe the carrier density in each level, accounting for the optical- and acoustic-phonon scattering processes. The confinement caused by the magnetic field strongly modifies the lifetimes of electrons in the excited state and results in pronounced oscillations of the optical gain as a function of the field. Numerical results are presented for the structure designed to emit at λ∼11.4μm, with the magnetic field varying in the range of 10–60T. The effects of band nonparabolicity are also included.
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