A sensitive and accurate atomic magnetometer based on free spin precession
Physics Department, University of Fribourg,
2 Paul Scherrer Institute, 5232 Villigen, Switzerland
a e-mail: email@example.com
b Present address: Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B3001 Leuven, Belgium.
Received in final form: 17 March 2015
Published online: 21 May 2015
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/ sensitivity ( <100 fT/ in the shotnoise limit) and an absolute accuracy at the same level.
Key words: Atomic Physics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2015