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 …

The generation of stable trains of ultrashort (femtosecond to picosecond), terahertz-
frequency radiation pulses with large instantaneous intensities is an underlying requirement …

Recently, there has been a growing interest in integrated THz photonics for various
applications in communications, spectroscopy and sensing. We present a new integrated …

Broadband metrological‐grade frequency comb (FC) synthesizers with a rich number of
phase locked modes are the ideal sources for quantum sensing and quantum metrology. At …

Frequency-modulated (FM) combs with a linearly-chirped frequency and nearly constant
intensity occur naturally in certain laser systems; they can be most succinctly described by a …

Mode locking, the self‐starting synchronous oscillation of electromagnetic modes in a laser
cavity, is the primary way to generate ultrashort light pulses. In random lasers, without a …

We demonstrate terahertz quantum cascade lasers realized in “ideal” ring resonators
without discontinuities from, eg, contacting pads. We realize this by mounting rings episide …

THz quantum cascade lasers (QCLs) based on double metal waveguides feature
broadband and high-temperature devices for their use in spectroscopy and sensing …

We present the operation of quantum cascade laser frequency combs in an external cavity
configuration. Experimental observations show dependence of comb repetition rate and …

We demonstrate the implementation of external cavity optical feedback to improve
coherence and promote generation of harmonic states by a mid-infrared quantum cascade …