Role of the ionic potential in high harmonic generation

D. Shafir; B. Fabre; J. Higuet; H. Soifer; M. Dagan; D. Descamps; E. Mével; S. Petit; H. J. Wörner; B. Pons; N. Dudovich; Y. Mairesse

doi:10.1103/PhysRevLett.108.203001

Role of the ionic potential in high harmonic generation

D. Shafir^*, B. Fabre, J. Higuet, H. Soifer, M. Dagan, D. Descamps, E. Mével, S. Petit, H. J. Wörner, B. Pons, N. Dudovich, Y. Mairesse

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

Recollision processes provide direct insight into the structure and dynamics of electronic wave functions. However, the strength of the process sets its basic limitations-the interaction couples numerous degrees of freedom. In this Letter we decouple the basic steps of the process and resolve the role of the ionic potential which is at the heart of a broad range of strong field phenomena. Specifically, we measure high harmonic generation from argon atoms. By manipulating the polarization of the laser field we resolve the vectorial properties of the interaction. Our study shows that the ionic core plays a significant role in all steps of the interaction. In particular, Coulomb focusing induces an angular deflection of the electrons before recombination. A complete spatiospectral analysis reveals the influence of the potential on the spatiotemporal properties of the emitted light.

Original language	English
Article number	203001
Journal	Physical Review Letters
Volume	108
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.108.203001
State	Published - 16 May 2012
Externally published	Yes

Funding

Funders	Funder number
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	128274
Seventh Framework Programme	228334

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10.1103/PhysRevLett.108.203001

Cite this

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AU - Shafir, D.

AU - Fabre, B.

AU - Higuet, J.

AU - Soifer, H.

AU - Dagan, M.

AU - Descamps, D.

AU - Mével, E.

AU - Petit, S.

AU - Wörner, H. J.

AU - Pons, B.

AU - Dudovich, N.

AU - Mairesse, Y.

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AB - Recollision processes provide direct insight into the structure and dynamics of electronic wave functions. However, the strength of the process sets its basic limitations-the interaction couples numerous degrees of freedom. In this Letter we decouple the basic steps of the process and resolve the role of the ionic potential which is at the heart of a broad range of strong field phenomena. Specifically, we measure high harmonic generation from argon atoms. By manipulating the polarization of the laser field we resolve the vectorial properties of the interaction. Our study shows that the ionic core plays a significant role in all steps of the interaction. In particular, Coulomb focusing induces an angular deflection of the electrons before recombination. A complete spatiospectral analysis reveals the influence of the potential on the spatiotemporal properties of the emitted light.

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Role of the ionic potential in high harmonic generation

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