Over the past decade, the demonstration of frequency combs has been reported in a wide
range of quantum cascade lasers. These combs have huge potential in applications …

Metasurfaces are engineered surfaces that consist of subwavelength periodic elements and
can be used to manipulate electromagnetic waves. Multifunctional or reconfigurable …

The dynamics of semiconductor lasers with fast gain is generally considered to suppress
amplitude modulation, resulting in a frequency‐modulated output. Since their first …

Wave instability—the process that gives rise to turbulence in hydrodynamics—represents
the mechanism by which a small disturbance in a wave grows in amplitude owing to …

The use of fundamental modelocking to generate short terahertz (THz) pulses and THz
frequency combs from semiconductor lasers has become a routine affair, using quantum …

Millimeter wave (mmWave) generation using photonic techniques has so far been limited to
the use of near-infrared lasers that are down-converted to the mmWave region. However …

Since the beginning of this millennium, frequency comb generators have reshaped
frequency metrology and related areas. After more than two decades since their first …

A monochromatic wave that circulates in a nonlinear and dispersive optical cavity can
become unstable and form a structured waveform. This phenomenon, known as modulation …

Harmonic frequency combs, in which the lasing modes are separated by a period of tens of
free spectral ranges from each other, have been recently discovered in quantum cascade …

Quantum cascade laser frequency combs are nowadays well-appreciated sources for
infrared spectroscopy. Here their applicability for free-space optical communication is …