For a model atom in a flat-top laser pulse, the nondipole shift of multiphoton photoelectron peaks depends on emission angle, dominated by electron recoil, with only a small redshift from retardation.
In this case, the envelope remains nearly constant for (Nosc−2) cycles and so the laser pulse resembles a flat-top pulse
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Multiphoton ionization distributions beyond the dipole approximation: Retardation versus recoil corrections
For a model atom in a flat-top laser pulse, the nondipole shift of multiphoton photoelectron peaks depends on emission angle, dominated by electron recoil, with only a small redshift from retardation.