It is demonstrated that three-dimensional propagation effects essentially influence attosecond-pulse generation by few-cycle, carrier-envelope-phase stabilized laser pulses used in a polarization-gating configuration. The rapidly changing polarization status gives rise to electron trajectories even longer than those observed with linearly polarized light, but the off-axis contributions and the propagation effects can efficiently act as a filter to produce a single attosecond pulse. It is also found that the attosecond beams can have a significant spatial divergence.
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