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We report on electron momentum distributions from single ionization of Ar instrong orthogonally polarized two-color (OTC) laser fields measured with theCOLTRIMS technique. We study the effect of Coulomb focusing whose signature isa cusp like feature in the center of the electron momentum spectrum. While thedirect electrons show the expected strong dependence on the phase between thetwo colors, surprisingly the Coulomb focused structure is almost not influencedby the weak second harmonic streaking field. This effect is explained by theuse of a CTMC simulation which describes the tunneled electron wave packet interms of classical trajectories under the influence of the combined Coulomb-and OTC laser field. We find a subtle interplay between the initial momentum ofthe electron upon tunneling, the ionization phase and the action of the Coulombfield that makes the Coulomb focused part of the momentum spectrum apparentlyinsensitive to the weaker streaking field.

Ionization in Orthogonal Two-Color Laser Fields - Origin and Phase Dependence of Trajectory-Resolved Coulomb Effects