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 …

Terahertz quantum cascade lasers (QCLs) emit radiation due to intersubband optical
transitions in semiconductor superlattices that could be engineered by design. Among a …

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 …

Terahertz light can be used to identify numerous complex molecules, but has traditionally
remained unexploited due to the lack of powerful broadband sources. Pulsed lasers can be …

In the last decade quantum cascade lasers (QCLs) have become the most widely used
source of mid-infrared radiation, finding large scale applications because of their wide …

New and emerging terahertz technology applications make this a very exciting time for the
scientists, engineers, and technologists in the field. New sensors and detectors have been …

Surface plasmons have found a broad range of applications in photonic devices at visible
and near-infrared wavelengths. In contrast, longer-wavelength surface electromagnetic …

In this paper we review recent progress in obtaining laser action from semiconductor
quantum cascade structures covering the low THz region of the electromagnetic spectrum …

We report on our progress in the development of a terahertz quantum cascade laser source
based on intracavity terahertz difference-frequency mixing in a dual-wavelength mid-infrared …

The operation of quantum cascade lasers has to date been demonstrated over a broad
frequency range in the terahertz spectrum (from 4.4 THz to 1.2 THz),,. Most potential …