369 citations · 1k across the 13 of their papers we have counts for
13 papers
A study of scalar optically-pumped magnetometers for use in magnetoencephalography without shielding
Richard J. Clancy, Vladislav Gerginov, Orang Alem +2
Scalar optically-pumped magnetometers (OPMs) are being developed in small packages with high sensitivities. The high common-mode rejection ratio of these sensors allows for detecti…
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…
Gradiometry-free noise suppression in RF atomic magnetometers
Vladislav Gerginov
We demonstrate the sensitivity of a sensor based on an optically-pumped radio-frequency (RF) atomic magnetometer to the polarization state of the detected RF magnetic field, and me…
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…
Two-photon optical frequency reference with active ac Stark shift cancellation
V. Gerginov, K. Beloy
An optical reference based on a two-photon optical transition with ac Stark shift cancellation is proposed. The reference uses two interrogating laser fields at different frequenci…
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…
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…
Phase Analysis for Frequency Standards in the Microwave and Optical Domains
M. Kazda, V. Gerginov, N. Huntemann +2
Coherent manipulation of atomic states is a key concept in high-precision spectroscopy and used in atomic fountain clocks and a number of optical frequency standards. Operation of…
Improved limit on a temporal variation of from comparisons of Yb and Cs atomic clocks
N. Huntemann, B. Lipphardt, Chr. Tamm +3
Accurate measurements of different transition frequencies between atomic levels of the electronic and hyperfine structure over time are used to investigate temporal variations of t…
A strontium lattice clock with inaccuracy and its frequency
Stephan Falke, Nathan Lemke, Christian Grebing +10
We have measured the absolute frequency of the optical lattice clock based on Sr at PTB with an uncertainty of using two caesium fountain clocks. This i…
Femtosecond frequency comb measurement of absolute frequencies and hyperfine coupling constants in cesium vapor
Jason E. Stalnaker, Vela Mbele, Vladislav Gerginov +4
We report measurements of absolute transition frequencies and hyperfine coupling constants for the 8S_{1/2}, 9S_{1/2}, 7D_{3/2}, and 7D_{5/2} states in ^{133}Cs vapor. The stepwise…
Observation of the Nuclear Magnetic Octupole Moment of 87Rb from Spectroscopic Measurements of Hyperfine Intervals
Vladislav Gerginov, Carol E. Tanner, W. R. Johnson
The magnetic octupole moment of 87Rb is determined from hyperfine intervals in the 5p 2P[3/2] state measured by Ye et al. [Opt. Lett. 21, 1280 (1996)]. Hyperfine constants A = 84.7…