PHYSICAL REVIEW A 93, 053615 (2016)
Min-Kang Zhou, Le-Le Chen, Qin Luo, Ke Zhang, Xiao-Chun Duan, and Zhong-Kun Hu *
MOE Key Laboratory of Fundamental Physical Quantities Measurements, School of Physics, Huazhong University of Science
and Technology, Wuhan 430074, People’s Republic of China
(Received 3 November 2015; revised manuscript received 23 March 2016; published 19 May 2016)
The mechanism of light-shift-related uncertainty in an atom-interferometry gravimeter is investigated systematically, which arises from the inhomogeneous intensity of Raman beams and the Gaussian distribution of an atomic cloud. Experiments using atom interferometry are performed to verify this systematic error by directly modulating the integration time T and the intensity ratio of Raman laser beams. Using our method, the uncertainty of gravity measurements contributed by the single-photon light shift in an atom gravimeter can be corrected to a sub-μGal (1 μGal = 1 × 10 −8 m/s 2 ) level.
