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 …

Terahertz technology Page 1 910 IEEE TRANSACTIONS ON MICROWAVE THEORY AND
TECHNIQUES, VOL. 50, NO. 3, MARCH 2002 Terahertz Technology Peter H. Siegel, Fellow …

Semiconductor devices have become indispensable for generating electromagnetic
radiation in everyday applications. Visible and infrared diode lasers are at the core of …

After the evolution of oxygen-producing cyanobacteria at some time before 2.7 billion years
ago, oxygen production on Earth is thought to have depended on the availability of nutrients …

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

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 …

We report terahertz frequency (3.5 THz, λ87 μm) emission from quantum-cascade lasers
employing a bound-to-continuum transition in the active region. The maximum operating …

A quantum-cascade laser operating at 66 m is demonstrated. It consists of a three-quantum-
well chirped-superlattice active region embedded in a waveguide based on a single …

Quantum-cascade lasers operating above 20 μm (at λ∼ 21.5 μm and λ∼ 24 μm)
wavelength are reported. Pulsed operation was obtained up to 140 K and with a peak power …