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Control of atomic single and double ionization dynamics using
orthogonally polarized two-color laser pulses
Zhang, L.; Xie, X.; Roither, S.; Kartashov, D.; Schöffler, M.; Shafir, D.;
Corkum, P.B.; Baltuka, A.; Staudte, A.; Kitzler, M.
Journal of Physics: Conference Series
OPEN ACCESS
Control of atomic single and double ionization
dynamics using orthogonally polarized two-color
laser pulses
To cite this article: L Zhang et al 2014 J. Phys.: Conf. Ser. 488 032011
View the article online for updates and enhancements.
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Control of atomic single and double ionization dynamics using orthogonally
po-larized two-color laser pulses
L. Zhang1, X. Xie1, S. Roither1, D. Kartashov1, M. Schöffler1, D. Shafir2, 3, P. B. Corkum2, A. Baltuška1, A.Staudte2, M. Kitzler1,*
1
Photonics Institute, Vienna University of Technology, Vienna, Austria
2
Joint Laboratory for Attosecond Science of the National Research Council and the University of Ottawa, Canada
3
Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot, Israel SynopsisSingle- and double-ionization of neon with orthogonally polarized two-color (OTC) laser fields is in-vestigated using the COLTRIMS method. We study the influence of the long range Coulomb potential of the parent ion on the final momentum distribution of electrons emitted during single ionization. Furthermore, we in-vestigate nonsequential double ionization in OTC fields and demonstrate that the electron-electron correlation is highly sensitive to the sub-cycle field shape of the OTC pulses, in agreement with recent theoretical predictions.
Angstrom and attosecond control of free electron wave packets is one of the pinnacles of attosecond science. Orthogonally polarized two-color (OTC) laser fields allow to control the motion of field-ionizing electronic wave pack-ets both in time and space [1]. In OTC pulses time and space are connected and thus an atto-second time scale is established in the polariza-tion plane for both the emitted and the re-colliding wave packets [2,3].
In this submission, we report on experiments that use OTC pulses for studying atomic single and double ionization. The three-dimensional momentum vector of electrons and ions created by single and double ionization of neon atoms was measured with the COLTRIMS technique as a function of the sub-cycle shape of the OTC pulses.
Fig. 1(a) shows the measured momentum distributions of electrons correlated with singly ionized neon in the polarization plane of the OTC field with relative phase Δφ between the two color components. The spectra show that the electron emission is sensitive to Δφ. Fur-thermore, the spectra feature a prominent x-shaped central structure and weaker fine-scale modulations due to wave packet interferences. By comparison with simulated spectra using the strong field approximation (SFA) and by solv-ing the two-dimensional time-dependent Schrö-dinger equation (TDSE) within the single active electron approximation, we conclude that the ion’s Coulomb field strongly affects the spatial distribution of released electron wave packets.
We furthermore demonstrate control over the correlation between the two electrons emitted during double ionization upon electron rec-ollsion by tuning the shape of the electric field
of the OTC pulses on the sub-cycle scale. Anal-ysis of the spectra of the sum momentum vector in terms of their mean values and widths along the polarization directions of the two colors al-lows obtaining detailed insight into the correlat-ed electron emission dynamics. Our analysis reveals that for certain relative phases Δφ a very strong electron-electron anti-correlation is ob-tained in exact agreement with theoretical pre-diction [4]. Thus, our measurements demon-strate that by using OTC laser fields it is possi-ble to control the electron-electron correlation during NSDI by using Δφ as the control param-eter.
Figure 1. (a) Measured electron momentum distribu-tions from single ionization of neon atoms in the la-ser polarization plane. (b) Calculated electron mo-mentum distributions using the SFA. (c) Simulated electron momentum distributions obtained by solv-ing the two-dimensional TDSE within the ssolv-ingle ac-tive electron approximation.
References
[1] M. Kitzler, M. Lezius 2005 Phys. Rev. Lett. 95 253001
[2] M. Kitzler et al. 2007 Phys. Rev. A 76 011801 [3] M. Kitzler et al. 2008 New J. Phys. 10 025029 [4] Y. Zhou et al. 2011 Opt. Expr. 19 2301 *E-mail: markus.kitzler@tuwien.ac.at
XXVIII International Conference on Photonic, Electronic and Atomic Collisions (ICPEAC 2013) IOP Publishing
Journal of Physics: Conference Series 488 (2014) 032011 doi:10.1088/1742-6596/488/3/032011
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