Abstract
The velocity distribution of the two-level-atom populations induced by a strong laser beam in the presence of collisions is investigated. By means of a previously proposed method we have conducted numerical calculations using the collisional kernels introduced by Berman and co-workers. The obtained results indicate the importance of the collisions. Also the intensity of the light beam strongly influences the velocity distributions of the lower and upper state populations. In particular for large perturber density and large field intensity the broadening of the distributions approaches that of a maxwellian one. Distinct asymmetry of the total population is also noted.
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