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Phys Rev Lett. 2017 Mar 3;118(9):093001. doi: 10.1103/PhysRevLett.118.093001. Epub 2017 Feb 27.

Limits of Strong Field Rescattering in the Relativistic Regime.

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Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA.


Recollision for a laser driven atomic system is investigated in the relativistic regime via a strong field quantum description and Monte Carlo semiclassical approach. We find the relativistic recollision energy cutoff is independent of the ponderomotive potential U_{p}, in contrast to the well-known 3.2U_{p} scaling. The relativistic recollision energy cutoff is determined by the ionization potential of the atomic system and achievable with non-negligible recollision flux before entering a "rescattering free" interaction. The ultimate energy cutoff is limited by the available intensities of short wavelength lasers and cannot exceed a few thousand Hartree, setting a boundary for recollision based attosecond physics.

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