首页|Determining the tilt of the Raman laser beam using an optical method for atom gravimeters
Determining the tilt of the Raman laser beam using an optical method for atom gravimeters
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Determining the tilt of the Raman laser beam using an optical method for atom gravimeters
The tilt of a Raman laser beam is a major systematic error in precision gravity measurement using atom interferome-try.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 characteriza-tion 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 charac-terize 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.
atom interferometerabsolute gravimeterprecision measurementtilt of Raman laser
骆华清、徐耀耀、崔嘉丰、邓小兵、周敏康、段小春、胡忠坤
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MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics,PGMF and School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China
Oak Ridge National Laboratory,Tennessee,USA
atom interferometer absolute gravimeter precision measurement tilt of Raman laser
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