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Jahrestagung der Österreichischen Physikalischen Gesellschaft

Experimental Investigations on the splitting of Coherent Population Trapping Resonances by the Nuclear Magnetic Moment

Roland Lammegger, Ivan Vasari, Christian Neureiter, Laurentius Windholz

Published Jan 1, 2006• 0 citations
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We have observed the splitting of coherent population trapping resonances in Cs vapor due to the influence of the nuclear magnetic moment which is already resolved in a magnetic field of about the strength of the geostatic field. By choosing appropriate laser polarizations and field direction vector and quadrupole coupled transitions can be investigated separately. The splitting allows to determine the ratio of nuclear to electronic g-factors.

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Experimental investigation of the width, amplitude and shape of the Coherent Population Trapping (CPT) resonances for magnetic field measurements by means of a Hanle effect configuration (the single frequency CPT resonances) is presented. Different resonance width narrowing effects for increasing the sensitivity of the magnetometers are discussed. Numerical simulations based on density matrix formalism, which take into account the influence of the high rank polarization moments and the velocity distribution of the atoms have been performed for analysis of the shapes of the resonances.
Coherent population trapping (CPT) provides a highly sensitive means for probing the energy-level structure of an atomic system. For a nitrogen-vacancy center in diamond, the CPT offers an alternative to the standard optically detected magnetic resonance method for measuring the hyperfine structure of the electronic ground states. We show that the nuclear-spin-dependent CPT measures directly the hyperfine splitting of these states due to the 14{}^{14}14N nuclear spin. The CPT spectral response obtained in the presence of a strong microwave field, resonant or nearly resonant with a ground-state spin transition, maps out the dynamic Stark splitting induced by the coherent spin excitation.