Abstract

We analyze the Hanle effect on the closed F<SUB>g</SUB> equals 3 yields F<SUB>e</SUB> equals 4 D<SUB>2</SUB>-line transition of <SUP>85</SUP>Rb, by both numerical solutions of the optical Bloch equations and by experimental investigations on cell containing rubidium vapor. For laser radiation with linear polarization orthogonal to the applied magnetic field, the Hanle signal is characterized by narrow bright resonances at low laser intensities. A bright resonance Hanle signal is obtained also exciting the rubidium atoms by circularly polarized laser light and scanning a transversely applied magnetic field, at different values of an applied longitudinal magnetic field. We report experimental and numerical evidence of this new bright resonance.

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