Volume 77, Number 6, March 2007
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||05 March 2007|
Refocussed relativistic recollisions
Max-Planck-Institut für Kernphysik - Saupfercheckweg 1, 69117 Heidelberg, Germany
Accepted: 2 February 2007
It is demonstrated that a magnetic field pulse can be applied to refocus a spreading electron wave packet in a relativistic recollision scheme. The drift due to the Lorentz force occurring in strong laser fields is employed to separate an electron from the core. Before it is driven back for recollision by a second counter-propagating laser pulse, the dynamics of wave packet spreading is reversed by a magnetic field pulse. At the instant of recollision, the electron wave packet is refocussed to small spatial widths while it holds maximal kinetic energy. This way, efficient recollisions are shown to occur up to the high-energy regime.
PACS: 41.75.Jv – Laser-driven acceleration / 34.80.Kw – Electron-ion scattering; excitation and ionization / 41.75.Ht – Relativistic electron and positron beams
© Europhysics Letters Association, 2007
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