Orientational effects on the amplitude and phase of polarimeter signals in double-resonance atomic magnetometry
AbstractDouble-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 (B0) magnitude. We present calculations and experimental data showing that the on-resonance polarimeter signal of light transmitted through an atomic vapor in arbitrarily oriented B0 may be modeled by considering the evolution of alignment terms in atomic polarization. We observe that the amplitude and phase of the magnetometer signal are highly dependent upon B0 orientation and present precise measurements of the distribution of these parameters over the full 4π solid angle.