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We demonstrate that the Hanle effect can be tuned between magneticallyinduced absorption (MIA) and magnetically induced transmission (MIT) simply bychanging the polarization of the input laser beam. The experiments are doneusing closed hyperfine transitions of the $ \rm D_2 $ line of ${\rm ^{133}Cs}$---$ F_g = 3 \rightarrow F_e = 2 $ and $ F_g =4 \rightarrow F_e = 5 $. Theformer shows a transformation from MIT to MIA, while the latter shows theopposite behavior. A qualitative explanation based on optical pumping andcoherences among the magnetic sublevels of the ground state is borne out by adetailed density-matrix calculation. To increase the coherence time, theexperiments are done in a Cs vapor cell with paraffin coating on the walls. Theobserved linewidth is extremely narrow ($\sim 0.1$ mG) compared to previouswork in this area, making this a promising technique for all kinds of precisionmeasurements.

Polarization dependent tuning of the Hanle effect in the ground state of Cs