Abstract
We have investigated the dependence of lock-in-demodulated M_x-magnetometer signals on the orientation of the static magnetic field mathbf {B}_{0} of interest. Magnetic resonance spectra for 2400 discrete orientations of mathbf {B}_{0} covering a 4pi solid angle have been recorded by a PC-controlled steering and data acquisition system. Off-line fits by previously derived lineshape functions allow us to extract the relevant resonance parameters (shape, amplitude, width, and phase) and to represent their dependence on the orientation of mathbf {B}_{0} with respect to the laser beam propagation direction. We have performed this study for two distinct M_x-magnetometer configurations, in which the rf-field is either parallel or perpendicular to the light propagation direction. The results confirm well the algebraic theoretical model functions. We suggest that small discrepancies are related to hitherto uninvestigated atomic alignment contributions.
Highlights
Pumped atomic magnetometers, known as optical magnetometers (OM), are based on resonant magneto-optical effects in atomic vapors [1]
We have investigated in detail the dependence of lockin detected signals produced by spin-orientation-based Mx-magnetometers on the orientation of the applied magnetic field of interest B0 and the orientation of the rf-field B1 used to drive the magnetic resonance in the magnetometer
We find a very good agreement between theoretical predictions and our observations
Summary
Known as optical magnetometers (OM), are based on resonant magneto-optical effects in atomic (usually alkali-metal) vapors [1]. ODMR magnetometers infer the modulus B0=ω0/γF of the magnetic field vector B0 from the (driven) Larmor precession frequency ω0 of an atomic vapor’s magnetization, where γF is the gyromagnetic ratio of the used atom (γF /2π ≈ 3.5Hz/nT for 133Cs). The precession is driven by a much weaker applied oscillating field B1(t) , called the ‘rf-field’. In the standard Mx-magnetometer, a single circularly polarized light beam whose frequency is resonant with an atomic transition is used both to create the medium’s spin polarization by optical pumping [4] and to read out the spin precession signal
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