We present a method to study current paths through quantum cascade lasers (QCLs). The temperature dependence of the current is measured at a fixed voltage. At low temperatures we find activation energies that correspond to the energy difference between the injector ground state and the upper laser level. At higher temperatures additional paths with larger activation energies are found. Applicat...

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Quantum cascade lasers (QCLs) represent the most fascinating achievement of quantum engineering, showing how artificial materials can be generated through design, with tailor-made properties. Their inherent nature deeply affects their core physical parameters. QCLs indeed display intrinsic linewidths approaching limit, and show spontaneous phase-locking emitted modes via intracavity four-wave-m...

of the Thesis Mid-infrared Quantum Cascade Lasers Modeling, Fabrication and Characterization

This theoretical work explores the carrier dynamical issues that must be confronted if the recent successes of the mid-infrared quantum cascade laserss1] are to be translated into longer wavelength devices. Whilst the small subband separations lead to a partial suppression of longitudinal optic (LO) phonon emission, which is the dominant non-radiative loss mechanism in quantum cascade lasers, i...

We present simulations of midand far-infrared quantum cascade lasers operating with/without external magnetic field. Maxwell–Bloch solver based on the finite-difference time-domain method was used in our investigation. Reduction of the far-infrared quantum cascade laser emission intensity is associated with increased optical losses in highly doped layers when magnetic field is changed from 4.2 ...