Journal of Physics B Atomic Molecular and Optical Physics

Measurement and modelling of enhanced absorption Hanle effect resonances in85Rb

Andrea Vilardi, Davide Tabarelli, Laura Botti, Andréa D Bertoldi, Leonardo Ricci

Published Feb 23, 2009• 7 citations

Abstract

We report on a detailed measurement of the enhanced absorption Hanle effect resonances in 85 Rb.The effect was analysed with an experimental setup allowing for the control of each magnetic field component within 1 mG.The characterization deals with the dependence of resonances, observed under different magnetic field conditions, on the frequency, intensity and polarization of the exciting radiation field.An analytic model that precisely describes the resonance behaviour is discussed.

DOI: 10.1088/0953-4075/42/5/055003

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Journal of Physics B Atomic Molecular and Optical Physics

Measurement and modelling of enhanced absorption Hanle effect resonances in85Rb

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Published Feb 23, 2009• 7 citations

Publisher

Abstract

DOI: 10.1088/0953-4075/42/5/055003

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We have analyzed the Hanle effect on the closed ${F}_{\mathrm{g}}=\stackrel{\ensuremath{\rightarrow}}{3}{F}_{\mathrm{e}}=4$

{D}_{2}

-line transition of

{}^{85}\mathrm{Rb}.

Exciting the rubidium atoms by circularly polarized laser light, and scanning an applied transverse magnetic field, a bright resonance Hanle signal is obtained at different values of an applied longitudinal magnetic field. We report experimental and numerical evidence of this bright resonance.

^{87}\mathrm{Rb}

. The EIT resonance observed with the light field locked on the ${F}_{g}=1\ensuremath{\rightarrow}{F}_{e}=2$ transition of

^{87}\mathrm{Rb}

is an influence of the nearby ${F}_{g}=1\ensuremath{\rightarrow}{F}_{e}=0$ closed and ${F}_{g}=1\ensuremath{\rightarrow}{F}_{e}=1$ open transitions. With increase in ellipticity the observed EIA and EIT resonances diminish in amplitude for a longitudinal magnetic field and are enhanced for a transverse magnetic field. We computationally account for these observations and discuss the factors that influence the EIA and EIT resonance amplitudes as a function of ellipticity and show that for a transverse field scan the ellipticity dependence of the EIA resonance amplitude can be accounted for without invoking the Doppler effect unlike for a longitudinal field scan. We also show that the maximum in the EIA resonance amplitude obtained for nonzero ellipticities with a longitudinal magnetic field depends on the closedness of the atomic system.

\hat {\rho }

in the formalism of irreducible tensor operators. The parameters relating different polarization moments in each equation are visualized using the modified sparse matrix of the system. It is established by numerical simulation that the shape, width, amplitude, and sign of nonlinear magnetooptical resonances change nonmonotonically with a change in the parameters of the excitation radiation and atomic system. The presented theoretical results are in good agreement with the experimental data obtained under various conditions.