Ultrafast fibre lasers are fundamental building blocks of many photonic systems used in
industrial and medical applications as well as for scientific research. Here, we review the …

Laser frequency combs are coherent light sources that emit a broad spectrum of discrete,
evenly spaced narrow lines whose absolute frequency can be measured to within the …

We demonstrate the first cavity-enhanced optical frequency comb spectroscopy in the mid-
infrared wavelength region and report the sensitive real-time trace detection of hydrogen …

Quantum cascade lasers (QCLs) are becoming a key tool for plenty of applications, from the
mid-infrared (mid-IR) to the THz range. Progress in related areas, such as the development …

Five very weak transitions—O (2), O (3), O (4), O (5) and Q (5)—of the first overtone band of
H2 are measured by very high sensitivity CW-Cavity Ring Down Spectroscopy (CRDS) …

Quantum cascade lasers (QCLs) are becoming a key tool in several advanced experiments
in the field of precision molecular spectroscopy and absolute frequency metrology. In view of …

We present measurements of molecular transition frequencies based on the comb-locked
cavity ring-down spectroscopy technique, reporting vacuum transition frequencies of …

The ν 1 fundamental band of N 2 O is examined by a novel spectrometer that relies on the
frequency locking of an external-cavity quantum cascade laser around 7.8 µm to a near …

We demonstrate coherent phase locking of a room-temperature continuous-wave quantum
cascade laser (QCL) at 9.1 μm to a Tm-fiber laser frequency comb centered at 2 μm, with an …

Nanoscale metal–insulator–metal (MIM) diodes represent important devices in the fields of
electronic circuits, detectors, communication, and energy, as their cutoff frequencies may …