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Area of Science:

  • Atomic Physics
  • Quantum Control
  • Ultrafast Science

Background:

  • Traditional electron bunch radiation is often incoherent, limiting applications in precise quantum control.
  • Attosecond coherent control techniques require highly controlled and coherent light sources.

Purpose of the Study:

  • To generate longitudinally coherent extreme ultraviolet (XUV) wave packets using undulator radiation.
  • To demonstrate attosecond coherent control over excited state alignment in helium atoms.

Main Methods:

  • Utilized a tandem undulator to produce pairs of 10-cycle XUV wave packets with attosecond-controlled spacing.
  • Employed temporal coherent control with circular polarization for photoexcitation of helium atoms.
  • Monitored fluorescence yield oscillations as a function of attosecond-controlled delay time.

Main Results:

  • Successfully controlled the excited state alignment of helium atoms using attosecond-controlled XUV wave packets.
  • Observed oscillations in fluorescence yield directly correlated with the attosecond delay time.
  • Demonstrated the generation of longitudinally coherent wave packets from undulator radiation.

Conclusions:

  • Undulator radiation can be harnessed to create coherent wave packets for attosecond control.
  • Overcame the limitations of incoherent radiation for advanced quantum manipulation applications.
  • Opened new possibilities for attosecond coherent control in atomic and molecular physics.