Phase-dependent sidelobes in high-order above-threshold ionization in a bichromatic laser field

We investigate the recently observed sidelobes in the angular distribution of high-order above-threshold ionization (ATI) by placing an atom in a bichromatic laser field of frequencies and where both components have a relative phase . Using an improved Keldysh - Faisal - Reiss (KFR) model, in which the Coulomb effects of the parent ions are taken into account, we show that even for a second field of very low intensity, drastic changes in the angular distributions occur as a function of the phase . Relations of our work to previous investigations are established.

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