Determining the tilt of the Raman laser beam using an optical method for atom gravimeters

Luo, Hua-Qing; Xue, Yao-Yao; Cui, Jia-Feng; Deng, Xiao-Bin; Zhou, Min-Kang; Duan, Xiao-Chun; Hu, Zhong-Kun

doi:10.1088/1674-1056/ad7b00

Determining the tilt of the Raman laser beam using an optical method for atom gravimeters

Journal Article · Fri Nov 01 00:00:00 EDT 2024 · Chinese Physics B

DOI:https://doi.org/10.1088/1674-1056/ad7b00· OSTI ID:2478342

Luo, Hua-Qing ^[1]; Xue, Yao-Yao ^[1]; ^[2]; Deng, Xiao-Bin ^[1]; Zhou, Min-Kang ^[1]; Duan, Xiao-Chun ^[1]; Hu, Zhong-Kun ^[1]

Huazhong Univ. of Science and Technology, Wuhan (China)
Huazhong Univ. of Science and Technology, Wuhan (China); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

The tilt of a Raman laser beam is a major systematic error in precision gravity measurement using atom interferometry. The conventional approach to evaluating this tilt error involves modulating the direction of the Raman laser beam and conducting time-consuming gravity measurements to identify the error minimum. In this work, we demonstrate a method to expediently determine the tilt of the Raman laser beam by transforming the tilt angle measurement into characterization of parallelism, which integrates the optical method of aligning the laser direction, commonly used in freely falling corner-cube gravimeters, into an atom gravimeter. A position-sensing detector (PSD) is utilized to quantitatively characterize the parallelism between the test beam and the reference beam, thus measuring the tilt precisely and rapidly. After carefully positioning the PSD and calibrating the relationship between the distance measured by the PSD and the tilt angle measured by the tiltmeter, we achieved a statistical uncertainty of less than 30 µrad in the tilt measurement. Furthermore, we compared the results obtained through this optical method with those from the conventional tilt modulation method for gravity measurement. The comparison validates that our optical method can achieve tilt determination with an accuracy level of better than 200 µrad, corresponding to a systematic error of 20 µGal in g measurement. This work has practical implications for real-world applications of atom gravimeters.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Key Research and Development Program of China; USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2478342

Journal Information:: Chinese Physics B, Journal Name: Chinese Physics B Vol. 33; ISSN 1674-1056

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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