Hanle Effect in Frequency Dependent Photon Reservoir

N. Beverini, Mara Galli, M. Inguscio +1 more

Jakub Zakrzewski, T. Dohnalik

The level-crossing effect for a three-level atom placed into the resonant cavity (waveguide) and illuminated by a strong monochromatic laser light is discussed. The cavity plays the role of a frequency-dependent photon reservoir that modifies the spontaneous decay of the atom. The effect is studied by considering the modifications of the level-crossing (Hanle effect) signals. The non-Markovian character of spontaneous emission in frequency-dependent reservoirs is taken into account. Calculated signals are interpreted in terms of a dressed atom picture.

Allen M. Flusberg, THOMAS W. MOSSBERG, Sven R. Hartmann

G. Moruzzi, F. Strumia, N. Beverini

C D Chapman

The Hanle effects signals originating in the 6 3 P 1 level of 199 Hg, produced by a quasistatic magnetic field, are altered by the application of a strong radio frequency magnetic field at right angles to the static field. The Hanle profiles are broadened, and time dependent components appear in the fluorescent optical field, whose intensities and linewidths are resonant functions of a static magnetic field parallel to the r.f. field.

Raghwinder Singh Grewal

Abstract We report theoretical investigations on the transient dynamics of the ground-state Hanle effect in the Voigt geometry, where a time-varying scanning magnetic field B (t) is applied perpendicular to the light propagation direction. Transient Hanle signals are calculated for different light polarizations using a theoretical model based on the density matrix approach. First, we study the ellipticity dependence of transient Hanle signals in two configurations in which the major axis of the light polarization ellipse ( ε a ) is aligned either perpendicular or parallel to the field B . For ε a ⊥ B , elliptical polarization of the light produces oscillations of frequencies 2ΩL(t) and ΩL(t) simultaneously, where ΩL(t) is the Larmor frequency of the corresponding field B (t). On the other hand, in the case of ε a || B , only ΩL(t) oscillation is observed using elliptically polarized light. Second, we vary the tilt angle between the polarization vector of a linearly polarized light and the orientation of the field B and study its effect on the transient response of Hanle signals. Both the amplitude and the decay rate of the oscillations show a strong dependence on the light ellipticity and tilt angle of the polarization vector. In addition, the influence of the magnetic field sweep rate on the transient signals is demonstrated for given values of light ellipticity and polarization angle.