Optical atomic clocks represent the state of the art in the frontier of modern measurement
science. In this article a detailed review on the development of optical atomic clocks that are …

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

We report the main features and performances of a prototype of an ultra-stable cavity
designed and realized by industry for space applications with the aim of space missions …

In this paper we report the evaluation of an optical lattice clock based on neutral mercury
with a relative uncertainty of $1.7\times {10}^{-16} $. Comparing this characterized frequency …

Ultracold fermionic atoms, having two valence electrons, exhibit a distinctive internal state
structure, wherein the nuclear spin becomes decoupled from the electronic degrees of …

Cold atom clocks have made remarkable progresses in the last two decades and played
critical roles in precision measurements. Primary Cs fountain frequency standards have …

Two-dimensional magneto-optical trapping (2D-MOT) is an efficient tool for generating a
high flux of precooled atoms. A 2D-MOT for mercury (Hg) is so far missing despite the …

We have carried absolute frequency measurements of the (6s^ 2)^ 1 S _0−(6s6p)^ 3 P _1
transition in^ 171 Y b (intercombination line), where the spin-1/2 isotope yields two hyperfine …

We have carried out concurrent optical frequency measurements of the ${(6 {{\rm
{s}}}^{2})}^{1}{{\rm {S}}} _ {0}-{(6 {\rm {s}} 6 {\rm {p}})}^{3}{{\rm {P}}} _ {1} $($ F=\frac {3}{2} $) …

An optical atomic clock with 171 Yb atoms is devised and tested. By using a two-stage
Doppler cooling technique, the 171 Yb atoms are cooled down to a temperature of 6±3 μK …