Based upon an over-one-month frequency comparison of two Ca+ 40 optical clocks, the
frequency difference between the two clocks is measured to be 3.2× 10-17 with a …

The unprecedented stability and accuracy of optical atomic clocks extend their role not only
in frequency metrology but also in fundamental physics and geodesy. In particular, excellent …

490 M. Takamoto et al./CR Physique 16 (2015) 489–498 phase. Nous commençons par une
revue des horloges optiques à Sr cryogéniques qui réduisent le décalage de fréquence dû …

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 …

We consider a narrow magneto-dipole transition in the Tm 169 atom at the wavelength of
1.14 μ m as a candidate for a two-dimensional-optical lattice clock. Calculating dynamic …

A comparison of two optical frequency standards and a detailed study of the systematic
frequency shifts of each 40 Ca+ single-ion optical frequency standard is presented. The …

We describe the development of an optical lattice clock based on mercury and the results
obtained since the 7 th SFSM. We briefly present a new solution for the cooling laser system …

We present a detailed study of the clock-transition spectrum of cold 171 Yb ytterbium atoms
in a 1D optical lattice. A typical clock-transition spectrum with a carrier-sideband structure is …

We present a compact, sub-Hertz 729 nm laser for a miniaturized 40 Ca+ single-ion optical
clock. An external cavity diode laser is frequency-stabilized to a horizontally mounted …

Stability is one of most important performances of an atomic clock. Here we describe our
recent work on improving the stability of our 40 Ca+ optical clock. State preparation is …