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Influence of two different laser beam profiles, the Gaussian and the Pi (top hat) profile on the resonance line widths and amplitudes in the Hanle electromagnetically induced transparency was studied. The laser beam propagates through the vacuum Rb glass cell. Studies were done at D-1 line for the open Rb-87: F-g = 2 -> F-e = 1 transition. Hanle electromagnetically induced transparency was measured for the two beam profiles with the same total power and beam diameter and experimental results showed that Gaussian and the top hat profiles give different amplitudes and widths of the Hanle resonances. Resonances obtained from the top hat laser beam profile have lower amplitudes and higher line widths.

Laser Beam Profile Influence on Dark Hanle Resonances in Rb Vapor