Six years after their birth, terahertz quantum-cascade lasers can now deliver milliwatts or
more of continuous-wave coherent radiation throughout the terahertz range—the spectral …

Quantum cascade (QC') lasers are reviewed. These are semiconductor injection lasers
based on intersubband transitions in a multiple-quantum-well (QW) heterostructure …

van der Waals (vdW) heterojunctions composed of two-dimensional (2D) layered materials
are emerging as a solid-state materials family that exhibits novel physics phenomena that …

In the majority of optoelectronic devices, emission and absorption of light are considered as
perturbative phenomena. Recently, a regime of highly non-perturbative interaction, ultra …

Continuous wave operation of quantum cascade lasers is reported up to a temperature of
312 kelvin. The devices were fabricated as buried heterostructure lasers with high-reflection …

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 …

Resonant-phonon terahertz quantum-cascade lasers operating up to a heat-sink
temperature of 186 K are demonstrated. This record temperature performance is achieved …

We report the demonstration of a terahertz quantum-cascade laser that operates up to 164 K
in pulsed mode and 117 K in continuous-wave mode at approximately 3.0 THz. The active …

Two terahertz quantum cascade lasers based on Ga As∕ Al 0.1 Ga 0.9 As heterostructures
are reported. Pulsed mode operation up to 84 K and continuous wave (cw) power of 0.36 …

Over the past decade, the demonstration of frequency combs has been reported in a wide
range of quantum cascade lasers. These combs have huge potential in applications …