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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Attosecond pulse shaping around a Cooper minimum.

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Summary
This summary is machine-generated.

High harmonic generation measures the spectral phase of the recombination dipole matrix element in argon. The Cooper minimum

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Optics
  • Attosecond Science

Background:

  • High harmonic generation (HHG) is a crucial tool for probing electron dynamics in atoms and molecules.
  • Understanding the spectral phase of the recombination dipole matrix element (RDM) is key to controlling attosecond pulse generation.
  • The Cooper minimum (CM) in photoionization introduces complex spectral features that affect HHG.

Purpose of the Study:

  • To experimentally measure the spectral phase of the RDM in argon across a wide frequency range, including the 3p Cooper minimum.
  • To compare the measured RDM phase with theoretical predictions based on photoionization scattering.
  • To investigate the influence of the RDM spectral phase on the temporal characteristics of attosecond bursts generated via HHG.

Main Methods:

  • Utilized high harmonic generation (HHG) in argon gas.
  • Spectrally resolved measurements of high harmonic emission.
  • Reconstruction of attosecond pulse properties from HHG spectra.
  • Comparison with theoretical models of photoionization and RDM phase.

Main Results:

  • The spectral phase of the RDM in argon was accurately measured over a broad frequency range encompassing the 3p Cooper minimum.
  • Experimental RDM phase data showed excellent agreement with theoretical predictions derived from s- and d-channel photoionization contributions.
  • Reconstructed attosecond bursts revealed that the group delay, derived from RDM phase, does not directly represent emission time due to the Cooper minimum's influence.
  • The Cooper minimum significantly reshapes the attosecond bursts, altering their temporal profiles.

Conclusions:

  • The spectral phase of the RDM can be reliably measured using HHG, providing insights into electron-light interactions.
  • The Cooper minimum's effect on RDM phase is significant and must be considered for accurate interpretation of attosecond pulse dynamics.
  • The conventional interpretation of group delay as emission time is insufficient when strong spectral phase variations, like those near a Cooper minimum, are present.