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A sensitive and accurate atomic magnetometer based on free spin precession

Grujić, Zoran ; Koss, Peter ; Bison, Georg ; Weis, Antoine

In: The European Physical Journal D, 2015, vol. 69, no. 5, p. 1-10

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    Titre
    • A sensitive and accurate atomic magnetometer based on free spin precession
    Auteur
    • Grujić, Zoran. Physics Department, University of Fribourg, 1700, Fribourg, Switzerland
    • Koss, Peter. Physics Department, University of Fribourg, 1700, Fribourg, Switzerland
    • Bison, Georg. Paul Scherrer Institute, 5232, Villigen, Switzerland
    • Weis, Antoine. Physics Department, University of Fribourg, 1700, Fribourg, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • The European Physical Journal D, 2015, vol. 69, no. 5, p. 1-10. Springer Berlin Heidelberg
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:331256
    Summary
    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: