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 lasers are unipolar semiconductor lasers covering a wide range of the
infrared and terahertz spectrum. Lasing action is achieved by using optical intersubband …

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 waves, which lie in the frequency range of 0.1-10 THz, have long been
investigated in a few limited fields, such as astronomy, because of a lack of devices for their …

Research and development in the terahertz portion of the electromagnetic spectrum has
expanded very rapidly during the past fifteen years due to major advances in sources …

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

The terahertz (THz) frequency quantum cascade laser (QCL) is a compact source of THz
radiation offering high power, high spectral purity and moderate tunability. As such, these …

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 …

The design and projected performance of quantum-well infrared photodetectors (QWIP) for
the terahertz (1-10 THz) or the very-far-infrared region are presented together with our initial …

The fabrication and investigation of single and multilayered structures have become an
essential issue in the past decades since these structures directly define valuable properties …