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

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Abstract

This paper demonstrates the evaluation of the radial inhomogeneity of the magnetic field of an atomic fountain clock, which affects the Ramsey interference fringe visibility. Based on the simplified inhomogeneous magnetic field model, the relationship between the fringe visibility and the inhomogeneity of the magnetic field is obtained; a magnetic field broadening limit of 70 pT for the ${^{87}{\rm Rb}}$ fountain clock is observed when the interference fringes disappear. Magnetic field broadening of 100 pT in the local interaction region of the ${^{87}{\rm Rb}}$ atomic fountain clock is measured by a special magnetic-sensitive Ramsey interference method. It is verified that the non-uniform widening of the magnetic field is the cause of the absence of interference fringes of adjacent lines.

© 2020 Optical Society of America

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