Since their inception, optical frequency combs have transformed a broad range of technical
and scientific disciplines, spanning time keeping to navigation. Recently, dual comb …

Terahertz laser frequency combs based on quantum cascade lasers provide coherent,
broadband, electrically pumped, THz radiation sources for use in future spectroscopic …

Optical frequency combs act as rulers in the frequency domain and have opened new
avenues in many fields such as fundamental time metrology, spectroscopy and frequency …

Due to its fast and high-resolution characteristics, dual-comb spectroscopy has attracted an
increasing amount of interest since its first demonstration. In the terahertz frequency range …

It was recently demonstrated that broadband quantum cascade lasers can operate as
frequency combs. As such, they operate under direct electrical pumping at both mid-infrared …

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

Dual-comb spectroscopy (DCS) is an emerging spectroscopic tool with the potential to
simultaneously achieve a broad spectral coverage and ultrahigh spectral resolution with …

Frequency combs have made optical metrology accessible to hundreds of laboratories
worldwide and they have set new benchmarks in multi-species trace gas sensing for …

Because of the ultrafast and photon-driven nature of the transport in their active region, we
demonstrate that quantum cascade lasers can be operated as resonantly amplified terahertz …

We present a widely tunable, monolithic terahertz source based on intracavity difference
frequency generation within a mid-infrared quantum cascade laser at room temperature. A …