Light-force-induced shift in laser spectroscopy of atomic helium

X. Zheng (郑昕), Y. R. Sun (孙羽), J.-J. Chen (陈娇娇), J.-L. Wen (温金录), and S.-M. Hu (胡水明)
Phys. Rev. A 99, 032506 – Published 12 March 2019

Abstract

A laser-power-dependent shift has been observed in various atomic beam spectroscopy measurements, which was often treated by extrapolating the results to the zero-field limit. Here we present an experimental and theoretical study of this effect in the measurements of the 23S23P transition frequency of He4. The light-force-induced shift was attributed as a result of modulated atomic trajectories induced by the standing-wave laser field and consequent distortions in the lineshape. Modulation of the beam spatial distributions was detected by imaging atoms at high laser power and was also simulated by the Monte Carlo wave-function approach. The nonlinear behavior of the light-force-shift was observed experimentally and reproduced by the simulations. The systematic shift in the extrapolated result at the zero-field limit was analyzed. As a consequence of this effect, a correction of +0.50(80) kHz was added to our previous result on the 23S123P1 transition frequency [Phys. Rev. Lett. 119, 263002 (2017)], and the reevaluated value is 276 734 477 704.3(1.6) kHz.

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  • Received 30 November 2018

DOI:https://doi.org/10.1103/PhysRevA.99.032506

©2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

X. Zheng (郑昕)1,2,*, Y. R. Sun (孙羽)1,2,†, J.-J. Chen (陈娇娇)1, J.-L. Wen (温金录)1, and S.-M. Hu (胡水明)1,2

  • 1Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
  • 2CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China

  • *Present address: Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706, USA.
  • Corresponding author: robert@ustc.edu.cn

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Vol. 99, Iss. 3 — March 2019

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