Abstract
In this paper we demonstrate, through numerical calculations,the possibility of determining the field dependence of the acStark effect through the interaction of an atom (or molecule)with a bichromatic ultrafast laser field. The time-dependentSchrödinger equation is solved for a single active electronconfined to move in a square-well potential distorted by anintense Stark field in combination with a perturbative probefield which connects a pair of levels through photon absorption.The aim is to determine the field parameters that allow thedependence of the dynamic shift of the optically connectedlevels on the Stark field to be mapped out in real time. Thecalculations show that this can be achieved when the duration ofthe probe field is at least as short as the half-cycle period ofthe Stark field. An experimental realization of the proposedmeasurement scheme and its limitations are discussed. It is alsopossible, in principle, to adopt the ac Stark effect todetermine the absolute phase of the carrier wave of an ultrafastlaser pulse.
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