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Quantum cascade lasers in magnetic field: An active region model
Author(s) -
Savić I.,
Milanović V.,
Indjin D.,
Ikonić Z.,
Jovanović V. D.,
Harrison P.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200461758
Subject(s) - cascade , landau quantization , quantum cascade laser , magnetic field , laser , physics , population inversion , quantum , quantization (signal processing) , population , quantum electrodynamics , condensed matter physics , computational physics , quantum mechanics , chemistry , computer science , demography , chromatography , sociology , computer vision
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. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)