Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 22: Poster: Interaction with strong or short laser pulses

A 22.6: Poster

Dienstag, 13. März 2012, 16:30–19:00, Poster.V

Electron-energy bunching in laser-driven soft recollisions — •Alexander Kästner, Ulf Saalmann, and Jan-Michael Rost — Max-Planck-Institut für Physik komplexer Systeme, Dresden

We introduce soft recollisions in laser-matter interaction. They are characterized by a recollision of the electron aside the ion in contrast to the well-known head-on collisions responsible for high-harmonic generation or above-threshold ionization. We demonstrate that soft recollisions can cause a bunching of photo-electron energies through which a series of low-energy peaks emerges in the electron yield along the laser polarization axis [1]. This peak sequence is universal, it does not depend on the binding potential, and is found below an excess energy of one tenth of the ponderomotive energy. Furthermore we show that this series could be uncovered experimentally by use of few-cycle pulses with increasing pulse duration [2].

[1] A. Kästner, U. Saalmann and J.M. Rost, Phys. Rev. Lett. (in press).

[2] A. Kästner, U. Saalmann and J.M. Rost, J. Phys. B (in press).