Enhanced absorption Hanle effect on the Fg = F→Fe = F + 1 closed transitions

We analyse the Hanle effect on a closed Fg→Fe = Fg + 1 transition. Two configurations are examined, for linearly and circularly polarized laser radiation, with the applied magnetic field collinear to the laser light wavevector. We describe the peculiarities of the Hanle signal for linearly polarized laser excitation, characterized by narrow bright resonances at low laser intensities. The mechanism behind this effect is identified, and numerical solutions for the optical Bloch equations are presented for different transitions.

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