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Attosecond angle-resolved photoelectron spectroscopy.

S A Aseyev1, Y Ni, L J Frasinski

  • 1FOM-Institute AMOLF, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.

Physical Review Letters
|December 20, 2003
PubMed
Summary
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We characterized attosecond pulses using mixed-color atomic ionization. The relative harmonic phase, crucial for detecting single attosecond pulses, depends on the target gas used for high-harmonic generation.

Area of Science:

  • Quantum optics
  • Attosecond science
  • Atomic physics

Background:

  • Characterizing ultrashort light pulses is essential for studying ultrafast phenomena.
  • High-harmonic generation (HHG) is a key method for producing extreme ultraviolet (XUV) attosecond pulses.
  • Understanding the phase evolution of these pulses is critical for their application.

Purpose of the Study:

  • To characterize a train of attosecond pulses generated by HHG.
  • To investigate the encoding of the relative phase of harmonics in photoelectron dynamics.
  • To assess the suitability of a mixed-color ionization technique for attosecond pulse detection.

Main Methods:

  • Experiments using mixed-color (XUV+IR) atomic two-photon ionization.
  • Detection of photoelectrons using a velocity map imaging (VMI) spectrometer.

Related Experiment Videos

  • Varying the time delay between XUV and IR pulses to probe phase information.

    • Main Results:

    • The relative phase of harmonics is encoded in both photoelectron yield and angular distribution.
    • This encoding is observable as a function of the XUV-IR time delay.
    • The timing of the attosecond pulse relative to the driving laser field depends on the HHG target gas.

    Conclusions:

    • The mixed-color ionization technique is suitable for detecting single attosecond pulses.
    • The relative phase information is accessible via photoelectron measurements.
    • Target gas selection is a critical parameter for controlling attosecond pulse timing in HHG.