369 citations · 1.2k across the 15 of their papers we have counts for
15 papers
Continuous optical generation of microwave signals for fountain clocks
Burghard Lipphardt, Patrick Walkemeyer, Michael Kazda +2
For the optical generation of ultrastable microwave signals for fountain clocks we developed a setup, which is based on a cavity stabilized laser and a commercial frequency comb. T…
Long term measurement of the Sr clock frequency at the limit of primary Cs clocks
R. Schwarz, S. Dörscher, A. Al-Masoudi +7
We report on a series of 42 measurements of the transition frequency of the 429~THz (5s)~S--(5s5p)~P line in Sr taken over three years from 2017 to 2019.…
Direct comparisons of European primary and secondary frequency standards via satellite techniques
F. Riedel, A. Al-Masoudi, E. Benkler +46
We carried out a 26-day comparison of five simultaneously operated optical clocks and six atomic fountain clocks located at INRIM, LNE-SYRTE, NPL and PTB by using two satellite-bas…
Advances in the accuracy, stability, and reliability of the PTB primary fountain clocks
S. Weyers, V. Gerginov, M. Kazda +4
Improvements of the systematic uncertainty, frequency instability, and long-term reliability of the two caesium fountain primary frequency standards CSF1 and CSF2 at PTB (Physikali…
Optical Stabilization of a Microwave Oscillator for Fountain Clock Interrogation
Burghard Lipphardt, Vladislav Gerginov, Stefan Weyers
We describe an optical frequency stabilization scheme of a microwave oscillator that is used for the interrogation of primary caesium fountain clocks. Because of its superior phase…
Loading of a fountain clock with an enhanced Low-Velocity Intense Source of atoms
Georgi Dobrev, Vladislav Gerginov, Stefan Weyers
We present experimental work for improved atom loading in the optical molasses of a caesium fountain clock, employing a low-velocity intense source of atoms (LVIS) [Lu et al., Phys…