Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 34: Atoms in Strong Fields I
A 34.5: Talk
Friday, March 10, 2017, 12:15–12:30, N 2
Laser-subcycle control of sequential double-ionization dynamics of Helium — •Philipp Wustelt1,2, Max Möller1,2, Markus S. Schöffler3, Xinhua Xie3, Vaclav Hanus3, A. Max Sayler1,2, Andrius Baltuska3, Gerhard G. Paulus1,2, and Markus Kitzler3 — 1Institute of Optics and Quantum Electronics, Friedrich-Schiller-University Jena, D-07743 Jena, Germany — 2Helmholtz Institute Jena, D-07743 Jena, Germany — 3Photonics Institute, Technische Universität Wien, Vienna, Austria
We investigate sequential double-ionization of helium by intense close-to-circularly polarized few-cycle laser pulses using a classical trajectory-based model with two independent electrons. Simulated He2+ ion momentum distributions are compared to those obtained in recent benchmark experiments [1]. The influence of a number of pulse parameters such as peak intensity, carrier-envelope phase, pulse duration and second- and third-order spectral phase on the shape of the ion momentum distributions is studied. To explain certain fine-scale features observed in the measurement, it becomes important to consider subtle timing-variations in the two-electron emissions introduced by small values of chirp. This result demonstrates the possibility of controlling multi-electron dynamics on the attosecond time-scale by tuning the field-evolution of intense few-cycle laser pulses.
[1] Schöffler et al., Phys. Rev. A 93, 063421 (2016)