Controlling the Orbital Alignment in Atoms Using Cross-Circularly Polarized Extreme Ultraviolet Wave Packets

We report on the use of pairs of 10-cycle extreme ultraviolet wave packets with attosecond-controlled spacing emitted by individual relativistic electrons within an electron bunch passing through a tandem undulator. Based on the temporal coherent control technique with circular polarization, we succ...

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Bibliographic Details
Published in:Physical review letters 2019-12, Vol.123 (23), p.233401-233401, Article 233401
Main Authors: Kaneyasu, T, Hikosaka, Y, Fujimoto, M, Iwayama, H, Katoh, M
Format: Article
Language:English
Subjects:
Alignment
Circular polarization
Delay time
Electrons
Fluorescence
Helium atoms
Photoexcitation
Wave packets
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Summary:We report on the use of pairs of 10-cycle extreme ultraviolet wave packets with attosecond-controlled spacing emitted by individual relativistic electrons within an electron bunch passing through a tandem undulator. Based on the temporal coherent control technique with circular polarization, we succeeded in controlling the excited state alignment in the photoexcitation of helium atoms, which we verified through the observation of oscillation in fluorescence yield depending on the attosecond-controlled delay time. Our work demonstrates the potential of undulator radiation for the generation of longitudinally coherent wave packets suitable for attosecond coherent control, an application which has hitherto been hidden in the incoherent nature of the radiation pulse emitted by a bunch of electrons.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.123.233401