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 …

We present vertical light emission in continuous-wave mode from an interband cascade
laser (ICL) at a record temperature of up to 38 C. These results pave the way toward a more …

We present a bi-functional surface emitting and surface detecting mid-infrared device
applicable for gas-sensing. A distributed feedback ring quantum cascade laser is …

We investigate the high frequency modulation characteristics of mid-infrared surface-
emitting ring and edge-emitting ridge quantum cascade lasers (QCLs). In particular, a …

We introduce ring lasers with continuous π-phase shifts in the second order distributed
feedback grating. This configuration facilitates insights into the nature of the modal …

We present methods for beam modifications of ring quantum cascade lasers emitting around
λ= 9μm, which are based on novel distributed feedback grating designs. This includes the …

This study shows the first combination of a ring-shaped vertically emitting quantum cascade
laser (riQCL) providing two distinct emission wavelengths combined with a substrate …

A cavity scheme based on a half-ring with different radii is proposed and fabricated for 7–8
μm quantum-cascade lasers. A quantum-cascade laser with a half-ring cavity radius of 191 …

We demonstrate interband cascade lasers fabricated into ring-shaped cavities with vertical
light emission through the substrate at a wavelength of λ≈ 3.7 μm. The out-coupling …

The present work reports on the first application of a ring-cavity-surface-emitting quantum-
cascade laser (RCSE-QCL) for sensitive gas measurements. RCSE-QCLs are promising …