Abstract
Backward fluorescence of thick atomic vapors exhibits a dip in the spectra at line center and sub-Doppler structures. We present backward fluorescence spectra of cesium vapor when excited around D2 line for densities for which atoms undergo a few collisions before emitting a photon. Changes on dip symmetry relative to line center and of sub-Doppler structures are observed. We perform Monte-Carlo simulations to investigate the influence of collisions between atoms and of radiation trapping on the spectra. Sub-Doppler structures are interpreted as avoided quenching for excited atoms flying parallel to the surface of the cell. We found that collisions broaden the sub-Doppler structures but have little influence on the dip symmetry which is highly affected by radiation trapping. Moreover, radiation trapping is the main contribution to velocity redistribution that reduces sub-Doppler structures for the range of densities investigated.
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