Angular photoelectron spectra for atom ionization in an intense two-colour laser field

An analytical expression for the electron peak intensity of above-threshold ionization (ATI) in an intense laser field is obtained using strong field approximation (SFA) and pole approximation for the rescattering amplitude. Numerical calculations of angular distributions of ATI electrons in a two-colour laser field are performed. The calculations have shown the presence of intermediate sidelobes inside all energy spectra of ATI electrons. Also we obtain that intermediate sidelobes always transform to two sidelobes and finally in one back-directed lobe near cut-offs of the direct, rescattering monochromatic and bichromatic plateaux.

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