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Quantum path selection in high-harmonic generation by a phase-locked two-color field.

N Ishii1, A Kosuge, T Hayashi

  • 1Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba. 277-8581, Japan. ishii@issp.u-tokyo.ac.jp

Optics Express
|December 10, 2008
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Summary

Controlling quantum path selection in high-harmonic generation (HHG) is achieved by tuning the relative phase of a two-color laser field. This phase control influences electron trajectories and ionization timing, enabling selection of specific quantum paths.

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Area of Science:

  • Quantum optics
  • Attosecond science
  • Nonlinear optics

Background:

  • High-harmonic generation (HHG) is a crucial process for producing extreme ultraviolet and X-ray radiation.
  • Controlling the quantum pathways in HHG is essential for tailoring the generated light properties.
  • Previous studies have explored various methods to influence HHG, but precise control over electron trajectories remains a challenge.

Purpose of the Study:

  • To investigate the selection of quantum paths in high-harmonic generation (HHG) using a relative-phase-locked two-color laser field.
  • To demonstrate the control over electron ionization timing and trajectories on a sub-cycle timescale by tuning the relative phase.
  • To analyze the resulting harmonic spectra for phase-dependent features indicating quantum path selection.

Main Methods:

  • Utilizing a relative-phase-locked two-color laser field (fundamental and second-harmonic).
  • Tuning the relative phase between the two laser fields.
  • Analyzing the generated high-harmonic spectra to observe spectral features.
  • Correlating spectral features with electron trajectories and ionization dynamics.

Main Results:

  • Demonstrated control over the quantum path selection in HHG by adjusting the relative phase of the two-color laser field.
  • Observed a clear phase-dependent two-step feature in the harmonic spectra.
  • Attributed the observed spectral feature to the selection of two dominant electron trajectories.

Conclusions:

  • The relative phase of a two-color laser field provides a powerful tool for controlling quantum path selection in HHG.
  • Precise control over electron dynamics on a sub-cycle timescale is achievable.
  • This method offers a pathway to tailor the properties of HHG light for advanced applications.