Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.233401
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Funding
- JSPS KAKENHI [17H01075, 18K03489, 18K11945]
- Quantum Beam Technology Program of MEXT/JST
- Grants-in-Aid for Scientific Research [17H01075, 18K03489, 18K11945] Funding Source: KAKEN
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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.
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