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A sensitive and accurate atomic magnetometer based on free spin precession

  • Zoran D. GrujićEmail author
  • Peter A. Koss
  • Georg Bison
  • Antoine Weis
Regular Article

Abstract

We present a laser-based atomic magnetometer that allows inferring the modulus of a magnetic field from the free Larmor precession of spin-oriented Cs vapour atoms. The detection of free spin precession (FSP) is not subject to systematic readout errors that occur in phase feedback-controlled magnetometers in which the spin precession is actively driven by an oscillating field or a modulation of light parameters, such as frequency, amplitude, or polarization. We demonstrate that an FSP-magnetometer can achieve a ∼200 fT/√Hz sensitivity (<100 fT/√Hz in the shotnoise limit) and an absolute accuracy at the same level.

Graphical abstract

Keywords

Atomic Physics 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Zoran D. Grujić
    • 1
    Email author
  • Peter A. Koss
    • 1
  • Georg Bison
    • 2
  • Antoine Weis
    • 1
  1. 1.Physics DepartmentUniversity of FribourgFribourgSwitzerland
  2. 2.Paul Scherrer InstituteVilligenSwitzerland

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