Abstract
As is now well known, when an atom or molecule is ionized by an intense linearly polarized multicycle laser pulse, an electron wave packet is launched into the continuum at each half optical cycle and returns to the ion core several times, forming a train of attosecond electron bunches. In this paper, the possibility of controlling the relative proportion between the different electron bunches in the train using a two-harmonic multicycle laser field is demonstrated. This offers a highly promising method for disentangling the contribution of the different electron bunches to the electron-ion-recollision dynamics and eventually for probing ultrafast atomic or molecular dynamics.
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