Abstract The purpose of this article is to gather recent findings about the non-linear dynamics distributed feedback quantum cascade lasers (QCLs), with a view on practical applications in near future. As opposed other semiconductor lasers, usually emitting visible or near-infrared region, QCL technology takes advantage intersubband transitions and engineering emit mid-infrared far-infrared dom...

We monitor the temporal evolution of the electron population in the first and second subband of an undoped GaAs/AlGaAs asymmetric double quantum well after interband optical excitation by using an interband pump/intersubband probe technique. The spacing between the two subbands is smaller than the longitudinal optical phonon energy. We extract an intersubband lifetime of T21 = 100 ps and a reco...

In this work, the Coulomb scattering lifetimes of electrons in two coupled quantum wires have been studied by calculating the quasiparticle self-energy within a multisubband model of quasi-one-dimensional (Q1D) electron system. We consider two strongly coupled quantum wires with two occupied subbands. The intrasubband and intersubband inelastic scattering rates are caculated for electrons in di...

Using terahertz time-domain spectroscopy, the gain of scattering-assisted terahertz quantum cascade lasers is measured. By examining the intersubband gain and absorption over a wide range of bias voltages, we experimentally detect energy anticrossings—revealing information about the mechanism of laser action—and compare the resonant-tunneling injection scheme to the scatteringassisted injection...

Magneto-intersubband oscillations in a highly mobile two-subband electron system with one-dimensional periodic modulation of the potential under conditions overlapping Landau bands have been experimentally investigated. A significant modification magneto-intersubband relative to amplitude and phase is found: decreases reversal occurs some ranges magnetic fields. The obtained experimental data c...