Publications (4)
First international comparison of fountain primary frequency standards via a long distance optical fiber link
J. Guéna, S. Weyers, M. Abgrall +25
We report on the first comparison of distant caesium fountain primary frequency standards (PFSs) via an optical fiber link. The 1415 km long optical link connects two PFSs at LNE-S…
First industrial-grade coherent fiber link for optical frequency standard dissemination
F. Guillou-Camargo, V. Ménoret, E. Cantin +10
We report on a fully bi-directional 680~km fiber link connecting two cities for which the equipment, the set up and the characterization are managed for the first time by an indust…
Measuring the Boltzmann constant by mid-infrared laser spectroscopy of ammonia
S. Mejri, Papa Sow, O. Kozlova +7
We report on our ongoing effort to measure the Boltzmann constant, using the Doppler broadening technique on ammonia. This paper presents some of the improvements made to th…
A clock network for geodesy and fundamental science
C. Lisdat, G. Grosche, N. Quintin +32
Leveraging the unrivaled performance of optical clocks in applications in fundamental physics beyond the standard model, in geo-sciences, and in astronomy requires comparing the fr…