Optical frequency combs, consisting of well‐controlled equidistant frequency lines, have
been widely used in precision spectroscopy and metrology. Terahertz combs have been …

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 …

The ability to engineer quantum-cascade-lasers (QCLs) with ultrabroad gain spectra, and
with a full compensation of the group velocity dispersion, at terahertz (THz) frequencies, is …

Optical frequency comb synthesizers, operating in the harmonic regime, are metrological
sources in which the emitted optical power is concentrated in a few modes, spaced by …

Broadband, quantum-engineered, quantum cascade lasers (QCLs) are the most powerful
chip-scale sources of optical frequency combs (FCs) across the mid-infrared and the …

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 …

Terahertz quantum cascade laser sources based on intra-cavity difference frequency
generation from mid-IR devices are an important asset for applications in rotational …

A terahertz (THz) frequency comb capable of high-resolution measurement will significantly
advance THz technology application in spectroscopy, metrology and sensing. The recently …

Optical frequency comb synthesizers have represented a revolutionary approach to
frequency metrology, providing a grid of frequency references for any laser emitting within …

Quantum-cascade-laser (QCL) frequency combs are compact semiconductor light sources
operating in the mid-IR and terahertz frequencies. Achieving subpicosecond laser pulses …