Larmor frequency dressing by an anharmonic transverse magnetic field

Details Larmor frequency dressing by an anharmonic transverse magnetic field Larmor frequency dressing by an anharmonic transverse magnetic field

2011-12-06

arxiv.org/abs/1112.1309v2

Phys. Rev. A 85, 042510 (2012)

Physics

Atomic Physics

Published version has some minor changes; 22 pages and 8 pictures

Scientific paper

10.1103/PhysRevA.85.042510

We present a theoretical and experimental study of spin precession in the presence of both a static and an orthogonal oscillating magnetic field, which is nonresonant, not harmonically related to the Larmor precession, and of arbitrary strength. Due to the intrinsic nonlinearity of the system, previous models that account only for the simple sinusoidal case cannot be applied. We suggest an alternative approach and develop a model that closely agrees with experimental data produced by an optical-pumping atomic magnetometer. We demonstrate that an appropriately designed nonharmonic field makes it possible to extract a linear response to a weak dc transverse field, despite the scalar nature of the magnetometer, which normally causes a much weaker, second-order response.

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