We investigate collective emission from coherently driven ultracold 88Sr atoms. We perform
two sets of experiments using a strong and weak transition that are insensitive and sensitive …

Some 50 years ago, physicists, and after them the entire world, started to found their time
reference on atomic properties instead of motions of the Earth that have been in use since …

We consider various approaches to the creation of a high-stability active optical frequency
standard, where the atomic ensemble itself produces a highly stable and accurate frequency …

Atomic clocks have gained about 1 order of magnitude in accuracy every decade in the past
50 years, and the present best cases claim an uncertainty budget below1× 10− 17 in relative …

Measurement forms an essential part of our view of the world. Our world is measured and
calibrated, and we are all subject to the tyranny of these numbers. In this updated and …

STE-QUEST is a fundamental science mission which is considered for launch within the
Cosmic Vision programme of the European Space Agency (ESA). Its main scientific …

Considering the strong inhomogeneous spatial polarization and intensity distribution of
spontaneous decay fluorescence due to the Hanle effect, we propose and demonstrate a …

Relativistic celestial mechanics–investigating the motion celestial bodies under the
influence of general relativity–is a major tool of modern experimental gravitational physics …

Active optical frequency standard based on narrow bandwidth Faraday atomic filter is
proposed. The output laser power achieved to 42 µW. The laser frequency is determined by …

Two strontium lattice clocks, one in Japan and the other in Germany were directly compared
by a two-way satellite frequency transfer technique that utilizes the carrier phase of the …