Abstract
The ultrafast one-step and two-step two-photon absorption processes in a cascade three-level systeminduced by a strong femtosecond laser pulse is studied. The strong change of the population in the two-photonabsorption state at the zero points of the first derivative of the population in the real intermediate state showsstraightforwardly in time domain the footprint of the coherent one-step two-photon absorption.
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