Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 116: Focus Session: Structural Dynamics in Nanoscale Materials, Probed by Ultrafast Electron Pulses III
O 116.3: Vortrag
Freitag, 16. März 2018, 11:15–11:30, HE 101
Generation of attosecond electron pulses via ponderomotive interaction with tailored light fields — •Martin Kozák1,2, Timo Eckstein1, Norbert Schönenberger1, and Peter Hommelhoff1 — 1Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstrasse 1, 91058 Erlangen, Germany, EU — 2Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 12116 Prague 2, Czech Republic, EU
In this contribution we experimentally demonstrate the generation of attosecond electron pulse trains via a novel technique based on the inelastic ponderomotive scattering of electrons at an optical travelling wave created by two laser pulses at different frequencies. A large modulation of the kinetic energy of 29 keV electrons with a peak acceleration gradient of G=2.2 GV/m (energy gain/travelled distance) was observed using this technique [1]. After the interaction, a time-correlated energy modulation of the electrons leads to a ballistic compression due to the dispersive propagation of the electrons in vacuum. Detection of the sub-cycle temporal structure in the post-interaction electron distribution was performed via energy streaking using a second phase-controlled travelling wave interaction. Measured spectrograms and their comparison with numerical calculations allow monitoring the evolution of the electrons' longitudinal phase space distribution. In the temporal focal plane, attosecond electron pulse trains are formed with an individual pulse duration of 300 as. [1] Kozák, M., Eckstein, T., Schönenberger, N. & Hommelhoff, P., Nat. Phys. (2017), DOI: 10.1038/NPHYS4282.