EXTRA SUB-DOPPLER LINES IN THE VICINITY OF THE THIRD RESONANCE 6S-8P OF ATOMIC Cs ATTRIBUTED TO OPTICALLY INDUCED Cs DIMERS
Résumé
We report on the observation of extra sub-Doppler lines in a saturated absorption experiment when exploring the vicinity of the 6S1/2 8P3/2 transition of Cs ( = 388 nm). These extra lines are observed only under a relatively strong irradiation of both the pump and the probe beams. Extra narrow lines are also observed in co-propagating nonlinear spectroscopy, and around the lines of the V-type three-level system 8P3/2 - 6S1/2 - 8P1/2 (1 = 388 nm, 2 = 389 nm). We attribute theses extra-lines to a probing of high-lying molecular caesium, produced as a result of the optical excitation of Cs atoms, as the low Cs atom density ( 1012cm-3) is unable to populate significantly the dimer states in the condition of thermal equilibrium.
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