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Manipulation of High-Harmonic Generation Using an Engineered Two-Color Laser Field.

Indrajit Kabiraj1,2, Sonali Panda1,2, Vinitha Nimma1

  • 1Physical Research Laboratory Ahmedabad, Ahmedabad, India.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|March 27, 2026
PubMed
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Researchers used a two-color laser field to control high-harmonic generation (HHG). By adjusting the laser

Area of Science:

  • Attosecond science
  • Quantum optics
  • Strong-field physics

Background:

  • High-harmonic generation (HHG) produces extreme-ultraviolet and soft X-ray radiation.
  • Electron dynamics under strong laser fields dictate harmonic emission properties.

Purpose of the Study:

  • Investigate modulation of high-order harmonic yields using a temporally engineered two-color laser field.
  • Explore the influence of relative phase and intensity on HHG.

Main Methods:

  • Utilized a two-color laser field composed of a 1030 nm femtosecond pulse and its 515 nm second harmonic.
  • Performed semiclassical simulations to model electron trajectories and harmonic generation.
  • Experimentally controlled relative phase and intensity of the two laser fields.
Keywords:
high‐harmonic generationspectroscopystrong‐field physicstwo‐color laser fieldultrafast spectroscopy

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Main Results:

  • Demonstrated strong sensitivity of harmonic generation to the relative phase and intensity of the two-color laser fields.
  • Observed modulation of harmonic yields due to selective influence on tunnel ionization and electron trajectories.
  • Semiclassical simulations showed good qualitative agreement with experimental observations.

Conclusions:

  • Temporal engineering of laser fields offers precise control over high-harmonic generation.
  • Asymmetric two-color laser fields can selectively influence electron dynamics for tailored harmonic emission.
  • This approach provides a pathway for manipulating attosecond light sources.