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Sub-cycle ionization dynamics revealed by trajectory resolved, elliptically-driven high-order harmonic generation.

E W Larsen1, S Carlström1, E Lorek1

  • 1Department of Physics, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden.

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Summary
This summary is machine-generated.

Attosecond science reveals electron dynamics using high-order harmonic generation. Different electron trajectories probe varying laser field strengths, showing distinct responses to ellipticity and resonance.

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Area of Science:

  • Attosecond science
  • Strong-field physics
  • Quantum dynamics

Background:

  • Sub-cycle electron dynamics are crucial in strong laser fields.
  • High-order harmonic generation (HHG) is a key probe in attosecond science.

Purpose of the Study:

  • To investigate sub-cycle electron dynamics via HHG.
  • To analyze the influence of driving field ellipticity and resonant enhancement on electron trajectories.

Main Methods:

  • Utilizing high-order harmonic generation to probe electron dynamics.
  • Analyzing different electron trajectories contributing to the same harmonic order.
  • Investigating sensitivity to driving field ellipticity and resonant enhancement.

Main Results:

  • Different electron trajectories exhibit distinct sensitivities to driving field ellipticity.
  • Resonant enhancement is observed for specific long trajectories.
  • Accurate modeling requires accounting for sub-cycle changes in electron velocity and excursion time.
  • Dynamic Stark shifts enable resonant enhancement of off-resonant window resonances in argon.

Conclusions:

  • HHG can resolve sub-cycle electron dynamics by probing trajectories initiated at different times.
  • Understanding trajectory-dependent responses is essential for attosecond science.
  • Dynamic Stark shifts play a significant role in resonant enhancement phenomena.