Transient dynamics of optical-magnetic resonance in the presence of a detuned radio frequency field

Abstract

The transient evolution of optical-magnetic resonance of 133Cs atoms with the action of a radio-frequency (RF) field in the presence of a static magnetic field is demonstrated theoretically and experimentally. The atomic transient absorption signal irradiated by a linearly polarized light is observed for different frequencies and intensities of RF field in our experiment. We find that both the RF frequency and intensity can modify the character of the observed signals. In particular, with an intermediate intensity, when the frequency of the RF field does not match the Larmor precession caused by the static magnetic field, a two-frequency oscillation of the transient signal can be observed. However, for the resonant case or large detuning, the transient oscillation signals go back to single frequency. Theoretical analysis based on the simplified four-level density-matrix formalism strongly supports the presented experimental data. Moreover, the density-matrix visualization analysis based on angular momentum probability surface (AMPS) explains and confirms all the features of the experimental results. These quantifiable observations enable us to reveal the atomic transient evolution more intuitively.