Accumulative effects in temporal coherent control - art. no. 063413

This paper analyzes the result of a temporal coherent control experiment us ing trains of ultrashort laser pulses in the situation where the laser repe tition period is smaller than the relaxation times of the system. We focus on the accumulative effects present in sequential two-photon absorption. It is shown that stimulated emission due to the accumulation of population in the excited state give an important contribution to the coherently control led process. Excellent agreement is obtained in the comparison between expe riments in rubidium vapor and theory, where resonant pulse propagation is a lso taken into account.