We review experimental progress on optical atomic clocks and frequency transfer, and
consider the prospects of using these technologies for geodetic measurements. Today …

In the last ten years extraordinary results in time and frequency metrology have been
demonstrated. Frequency-stabilization techniques for continuous-wave lasers and …

Cube-shaped cavities explore many noteworthy applications in practice. Cans or storage
tanks are the possible application of large cavities, while thermosyphons are the classic …

Photonic synthesis of radiofrequency (RF) waveforms revived the quest for unrivalled
microwave purity because of its ability to convey the benefits of optics to the microwave …

This paper outlines the roadmap towards the redefinition of the second, which was recently
updated by the CCTF Task Force created by the CCTF in 2020. The main achievements of …

Active control and cancellation of residual amplitude modulation (RAM) in phase modulation
of an optical carrier is one of the key technologies for achieving the ultimate stability of a …

We develop and demonstrate a compact (less than 6 mL) portable Fabry-Pérot optical
reference cavity. A laser locked to the cavity is thermal noise limited at 2× 10^− 14 fractional …

This manuscript reviews recent progress in optical frequency references and optical
communication systems and discusses their utilizations in global satellite navigation …

We present a transportable ultra-stable clock laser system based on a Fabry–Perot cavity
with crystalline Al_0. 92Ga_0. 08As/GaAs mirror coatings, fused silica (FS) mirror substrates …

Ultralow-noise yet tunable lasers are a revolutionary tool in precision spectroscopy,
displacement measurements at the standard quantum limit, and the development of …