A simple method for characterization of the magnetic field in an ion trap using Be+ ions
Institut für Experimentalphysik, Heinrich-Heine-Universität
Received in final form: 5 October 2014
Published online: 1 December 2014
We demonstrate a simple method for the determination of the magnetic field in an ion trap using laser-cooled 9Be+ ions. The method is not based on magnetic resonance and thus does not require delivering radiofrequency (RF) radiation to the trap. Instead, stimulated Raman spectroscopy is used, and only an easily generated optical sideband of the laser cooling wave is required. The d.c. magnetic vector, averaged over the 9Be+ ion ensemble, is determined. Furthermore, the field strength can be minimized and an upper limit for the field gradient can be determined. The resolution of the method is 0.04 G at present. The relevance for precision rovibrational spectroscopy of molecular hydrogen ions is briefly discussed.
Key words: Quantum Optics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2014