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arXiv:2603.21202 · Journal of Experimental and Theoretical Physics Letters

T –3-Shift in a Short-Baseline Atomic Interferometer–Gravimeter

D.N. Kapusta, A E Bonert, Andrei Goncharov, V. I. Yudin, K. N. Adamov, A. V. Taichenachev, M. Yu. Basalaev, M. D. Radchenko, O. N. Prudnikov

Published Mar 1, 2026• 0 citations
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Abstract

This paper presents the first experimental observation and investigation of a lineshape-asymmetry-caused shift (LACS) in a short-baseline atomic interferometer–gravimeter. It is shown that this shift scales inversely with the cube of the free evolution time, $$ \propto {\kern 1pt} {{T}^{{ - 3}}}$$ , and can lead to a noticeable systematic error in the measured value of the gravitational acceleration $$g$$ at the level of 0.1–1 mGal ( $$T \approx $$ milliseconds). The obtained results are in good agreement with our previous theoretical studies and highlight the importance of accounting for LACS in high-precision absolute measurements of $$g$$ in compact atomic gravimeters.

DOI
10.1134/s002136402660045x

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This paper presents the first experimental observation and investigation of a lineshape-asymmetry-caused shift (LACS) in a short-baseline atomic interferometer–gravimeter. It is shown that this shift scales inversely with the cube of the free evolution time, ∝T−3 \propto {\kern 1pt} {{T}^{{ - 3}}}∝T−3 , and can lead to a noticeable systematic error in the measured value of the gravitational acceleration ggg at the level of 0.1–1 mGal ( T≈T \approx T≈ milliseconds). The obtained results are in good agreement with our previous theoretical studies and highlight the importance of accounting for LACS in high-precision absolute measurements of ggg in compact atomic gravimeters.
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This paper introduces an atomic gravimeter under development at KRISS for precise measurement of gravitational acceleration. The gravimeter based on atom interferometer uses two counter-propagating Raman lasers of π/2-π-π/2 pulse sequence and laser cooled87Rb atoms in free fall. Atomic interference fringes caused by Raman lasers were observed at various time intervals between the three Raman pulses. The frequency sweep rate α which compensates Doppler shift due to gravitational acceleration g was obtained from the interference fringes. In the presentation, the current status and recent results of the KRISS atomic gravimeter will be discussed.
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