Experimental realization of coherent dark-state magnetometers
Institut für Angewandte Physik, Universität Bonn, Wegelerstraße 8, 53115 Bonn, Germany
Accepted: 28 July 1998
Coherent population trapping resonances in cesium vapor can be used to determine DC flux densities in the range from to 1 mT with typically relative uncertainty. For fields modulated at a few kHz, we find sensitivities of below 10 pT within 0.5 s integration time. From the signal-to-noise ratio the sensitivity can be extrapolated to . A quantitative understanding of the lineshape allows to detect DC fields of several nT even when the Zeeman components of the resonance are not resolved.
PACS: 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light / 32.70.Jz – Line shapes, widths, and shifts / 07.55.Ge – Magnetometers for magnetic field measurements
© EDP Sciences, 1998