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Area of Science:

  • Quantum Dynamics
  • Strong-Field Physics
  • Ultrafast Spectroscopy

Background:

  • Observing ultrafast quantum dynamics typically requires complex pump-probe setups with time-delay scanning.
  • Reconstructing the full temporal response of driven systems from limited spectral data has been a significant challenge.

Purpose of the Study:

  • To demonstrate a novel method for reconstructing the complete temporal dipole response of a strongly driven system from a single absorption spectrum.
  • To apply this method for observing Rabi cycling in doubly excited atomic states in the few-femtosecond regime.
  • To identify the breakdown of few-level quantum dynamics in strong laser fields.

Main Methods:

  • Utilizing a single absorption spectrum obtained with a short initialization pulse.
  • Applying the technique to observe Rabi oscillations in doubly excited helium.
  • Analyzing the transition from few-level quantum dynamics to breakdown at high laser intensities.

Main Results:

  • Successfully reconstructed the full temporal dipole response from a single spectrum.
  • Observed Rabi cycling between doubly excited atomic states in the few-femtosecond timescale.
  • Pinpointed the critical laser intensity (approx. 2 TW/cm²) where few-level quantum dynamics break down in doubly excited helium.
  • Achieved single-shot, real-time-resolved signal reconstruction down to attosecond timescales for non-equilibrium matter.

Conclusions:

  • The developed approach offers a simplified and powerful alternative to conventional pump-probe spectroscopy for studying ultrafast phenomena.
  • This technique enables real-time observation of quantum dynamics without time-delay scanning, applicable to a wide range of timescales.
  • Future applications include fundamental quantum dynamics testing, and measuring/controlling ultrafast chemical and biological processes.