Abstract

Magnetic-sensitive Ramsey fringes are useful for the magnetic field evaluation of atomic fountain clocks. However, broadening mechanisms affect the visibility of the fringes and limit their application for measurement of the magnetic field. The magnetic-induced Rabi broadening, which comes from the magnetic field inhomogeneity in the microwave cavity of fountain clocks and results in the visibility reduction of the fringes, is demonstrated in this paper. Furthermore, an improved method to shorten the Rabi interaction time is proposed to suppress the broadening effect. Experiments are conducted on the rubidium 87 atomic fountain clock to test the broadening mechanism as well as to demonstrate the effectiveness of the improved method to suppress the broadening effect. As a result, we obtain magnetic-sensitive Ramsey fringes and evaluate the average magnetic field. The second-order Zeeman frequency shift also is evaluated with a fractional frequency shift of ${1.295} \times {{10}^{- 13}}$, and a frequency uncertainty of ${3} \times {{10}^{- 16}}$.

© 2021 Optical Society of America

Evaluation of the radial inhomogeneity of a magnetic field by magnetic-sensitive Ramsey interference fringes at ⁸⁷Rb atomic fountain clock

Qian Wang, Ning Zhang, Weijing Zhao, Qingchen Ji, Richang Dong, Rong Wei, and Yuzhu Wang
J. Opt. Soc. Am. B 37(6) 1775-1780 (2020)

Improvement of average magnetic field measurement based on magnetic-field-sensitive Ramsey fringes

Weijing Zhao, Wang Qian, Desheng Lv, and Rong Wei
Opt. Lett. 47(8) 2073-2076 (2022)

Polarization asymmetry of the dark-resonance frequency dependence on the magnetic field

Eugene A. Tsygankov, Maria I. Vaskovskaya, Dmitry S. Chuchelov, Sergei A. Zibrov, Vitali V. Vassiliev, Vladimir L. Velichansky, and Valery P. Yakovlev
J. Opt. Soc. Am. B 38(5) 1742-1747 (2021)

Light-shift comparison of electromagnetically induced transparency and coherent population trapping in continuous-wave and Ramsey spectroscopies

Xiaoyan Liu, Xu Zhao, Zhen Xu, and Zhengfeng Hu
J. Opt. Soc. Am. B 38(4) 1270-1275 (2021)

Free expanding cloud of cold atoms as an atomic standard: Ramsey fringes contrast

Stella Torres Müller, Daniel Varela Magalhães, Aida Bebeachibuli, Tiago Almeida Ortega, Mushtaq Ahmed, and Vanderlei Salvador Bagnato
J. Opt. Soc. Am. B 25(6) 909-914 (2008)