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Limits of Strong Field Rescattering in the Relativistic Regime
M Klaiber1, K Z Hatsagortsyan1, J Wu2
1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
Physical Review Letters
|March 18, 2017
Summary
Relativistic laser-driven atomic recollision shows an energy cutoff independent of ponderomotive potential. This cutoff is determined by ionization potential, not laser intensity, impacting attosecond physics.
Area of Science:
- Atomic Physics
- Quantum Mechanics
- Laser-Plasma Interactions
Background:
- Recollision phenomena are crucial in strong-field laser-atom interactions.
- Previous models established a scaling law for recollision energy cutoffs.
Purpose of the Study:
- Investigate relativistic recollision in laser-driven atomic systems.
- Determine the energy cutoff and its dependencies in the relativistic regime.
Main Methods:
- Employed a strong-field quantum description.
- Utilized a Monte Carlo semiclassical approach.
Main Results:
- The relativistic recollision energy cutoff is independent of ponderomotive potential (Up).
- This cutoff is governed by the atomic system's ionization potential.
- A non-negligible recollision flux exists before "rescattering free" interactions.
Conclusions:
- The established 3.2Up scaling is not applicable in the relativistic regime.
- The ultimate energy cutoff is limited by laser intensity, capping at a few thousand Hartree.
- This finding sets a boundary for recollision-based attosecond physics research.
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