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Related Experiment Video

Updated: Jun 1, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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Published on: October 23, 2018

Controlling the XUV transparency of helium using two-pathway quantum interference.

P Ranitovic1, X M Tong, C W Hogle

  • 1JILA and Department of Physics, University of Colorado and NIST, Boulder, Colorado 80309, USA.

Physical Review Letters
|June 15, 2011
PubMed
Summary

Intense laser fields combined with specific extreme ultraviolet (XUV) photons can achieve full electromagnetic transparency in atoms. This phenomenon arises from destructive interference between two distinct ionization pathways in helium.

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Last Updated: Jun 1, 2026

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Strong Field Physics

Background:

  • Atoms can ionize via multiphoton absorption when exposed to femtosecond laser and extreme ultraviolet (XUV) fields, even if XUV photon energy is below the ionization potential.
  • Intense laser fields can significantly alter the electronic structure of atoms.

Purpose of the Study:

  • To investigate the induction of full electromagnetic transparency in atoms using combined laser and multiple XUV fields.
  • To demonstrate a novel method for coherent control in highly excited atomic states under strong optical fields.

Main Methods:

  • Theoretical modeling of atomic ionization dynamics under combined femtosecond laser and dual XUV field irradiation.
  • Utilizing helium as a model system to study laser-modified electronic structure and interfering ionization pathways.

Main Results:

  • Full electromagnetic transparency is achievable when atoms are irradiated by an intense laser field and two distinct XUV photons.
  • The laser field modifies the atomic electronic structure, enabling two competing ionization pathways.
  • Destructive interference between these pathways leads to the observed transparency.

Conclusions:

  • This study presents a new approach for coherent control in strong-field atomic physics.
  • The findings open possibilities for manipulating light-matter interactions in highly excited atomic systems.