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 …

The mid-infrared (mid-IR) is a wavelength range with a variety of technologically vital
applications in molecular sensing, security and defense, energy conservation, and …

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 …

Quantum cascade lasers (QCLs) were once considered as inefficient devices, as the wall-
plug efficiency (WPE) was merely a few percent at room temperature. But this situation has …

Quantum cascade lasers (QCLs) emitting at wavelengths as short as 2.63–2.65 μ m are
demonstrated. The InAs/AlSb QCL design was optimized to weaken carrier leakage into the …

Recent developments in laser sources operating in the mid-IR (3–8 μ m) have been
motivated by the numerous possibilities for both fundamental and applied research. One …

We demonstrate quantum cascade lasers emitting at wavelengths of 3–3.2 μm in the InP-
based material system. The laser core consists of GaInAs/AlInAs using strain balancing …

We report on a heterogeneous active region design for terahertz quantum cascade laser
based frequency combs. Dynamic range, spectral bandwidth and output power have been …

An overview of the three competing mid-infrared semiconductor laser approaches, being
diode, quantum cascade and interband cascade laser designs, is given. Limiting factors as …

Quantum cascade lasers emitting below 3 μ m are demonstrated. The lasers based on the In
As∕ Al Sb material system emit at 2.95–2.97 μ m in pulsed mode with threshold current …