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Enhanced fully optically pumped magnetic resonance with optical sideband auxiliary pumping

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Abstract

We have proposed a new technique to obtain highly polarized atoms for improving the sensitivity of the all-optical Cs atomic magnetometer. In a Bell–Bloom magnetometer, the resonance pumping from the ground state $ {F_g} = 3 $ to the excited state $ {F_e} = 4 $ at the D1 line is used to polarize the Cs atoms and populate the sublevels of the $ |{F_g} = 4,{m_F} = 4\rangle $ partly as the transition $ {F_g} = 4 \to {F_e} = 3 $ remains leaking. Here we utilize a modulation technique to generate a sideband frequency to pump both transitions simultaneously, which drives more atoms to the target state $ |{F_g} = 4,{m_F} = 4\rangle $. This improvement significantly increases the magnetic resonance signal but with little effect on its linewidth. It is very suitable for the miniaturization of the atomic magnetometer in the future.

© 2019 Optical Society of America

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