5 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…