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 review the most recent technological and application advances of quantum cascade
lasers, underlining the present milestones and future directions from the Mid-infrared to the …

We propose a method to extract the upper laser level's (ULL's) excess electronic
temperature from the analysis of the maximum light output power (P max) and current …

We designed and demonstrated a terahertz quantum cascade laser based on indirect pump
injection to the upper lasing state and phonon scattering extraction from the lower lasing …

A Terahertz quantum cascade laser with a rather high injection coupling strength based on
an indirectly pumped scheme is designed and experimentally implemented. To effectively …

We adopt a self-consistent Maxwell–Bloch method to investigate the energy relaxation
process from unsaturated to saturated in the scattering-assisted terahertz quantum cascade …

We compare the electrical power dependence of the lattice temperature and the electronic
temperature of GaAs/Al x Ga 1-x As THz quantum cascade lasers (QCLs) with different …

We analyze the peculiar case where the free carrier absorption arising from LO phonon
absorption-assisted transitions becomes negative and therefore turns into a gain source for …

Prof. Spagnolo has performed research in fields related to optics and photonics, and in
particular to the study and applications of photonics devices in spectroscopy and optical gas …