Orientational effects on the amplitude and phase of polarimeter signals in double resonance atomic magnetometry

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Double resonance optically pumped magnetometry can be used to measure static magnetic fields with high sensitivity by detecting a resonant atomic spin response to a small oscillating field perturbation. Determination of the resonant frequency yields a scalar measurement of static field (B_0) magnitude. We present calculations and experimental data showing that the on-resonance polarimeter signal of light transmitted through an atomic vapour in arbitrarily oriented $B_0$ may be modelled by considering the evolution of alignment terms in atomic polarisation. We observe that the amplitude and phase of the magnetometer signal are highly dependent upon B_0 orientation, and present precise measurements of the distribution of these parameters over the full 4 pi solid angle.
Original languageEnglish
Number of pages6
JournalPhysical Review A
Publication statusAccepted/In press - 13 Jul 2017


  • magnetometry
  • static magnetic field
  • atomic polarisation


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