The terahertz (THz) quantum cascade laser (QCL), first demonstrated in 2002, is among the
most promising radiation sources in the THz region owing to its high output power and broad …

Even though already in the seventies, right after the invention of the quantum cascade laser
(QCL) concept, it was argued that this device could be operated in the THz (far-infrared) …

We present a terahertz quantum cascade laser operating on a thermoelectric cooler up to a
record-high temperature of 210.5 K. The active region design is based on only two quantum …

Terahertz (THz) quantum cascade lasers (QCLs) are semiconductor-based electrically
pumped laser sources that are based on electron transitions between the subbands in the …

We present a two-quantum well THz intersubband laser operating up to 192 K. The structure
has been optimized using non-equilibrium Green's function model. The result of this …

A terahertz quantum cascade laser (THz QCL) architecture is presented in which only the
ground state subbands of each quantum well are involved in the transport and lasing …

We study the impact of interface roughness on the operation of mid-IR and THz quantum
cascade lasers. Particular emphasis is given towards the differences between the Gaussian …

We investigate the impact of interface roughness (IFR) scattering on the performance of a
series of the state-of-the-art GaAs/Al x Ga 1-x As terahertz quantum cascade lasers (THz …

The external performance of quantum optoelectronic devices is governed by the spatial
profiles of electrons and potentials within the active regions of these devices. For example …

The state of the art terahertz-frequency quantum cascade lasers have opened a plethora of
applications over the past two decades by testing several designs up to the very limit of …