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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Elliptical polarization and probability of double ionization.

Xu Wang1, J H Eberly

  • 1Department of Physics and Astronomy, University of Rochester, Rochester Theory Center, Rochester, New York 14627, USA. wangxu@pas.rochester.edu

Physical Review Letters
|September 28, 2010
PubMed
Summary

The ellipticity of laser pulses influences the timing of electron double ionization. Higher ellipticity narrows the ionization window, enabling a new formula to predict double ionization probability based on laser ellipticity.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Mechanics
  • Laser Physics

Background:

  • Strong-field laser-matter interactions are crucial for understanding atomic and molecular processes.
  • Nonsequential double ionization (NSDI) is a complex phenomenon where two electrons are ejected from an atom or molecule by a single laser pulse.
  • The polarization state of intense laser pulses significantly affects ionization dynamics.

Purpose of the Study:

  • To investigate the relationship between the elliptical polarization of intense short laser pulses and the timing of strong-field nonsequential double ionization.
  • To develop an experimentally testable formula for predicting double ionization probability as a function of laser ellipticity.

Main Methods:

  • Theoretical analysis of strong-field laser-matter interactions.
  • Modeling the dynamics of nonsequential double ionization under elliptically polarized laser fields.
  • Derivation of a formula relating double ionization probability to laser ellipticity.

Main Results:

  • The degree of elliptical polarization directly correlates with the timing of nonsequential double ionization.
  • Increased ellipticity compresses the initiation of double ionization into a narrower time window.
  • This temporal compression unexpectedly influences the ionizing field strength, leading to a predictable outcome.

Conclusions:

  • Laser pulse ellipticity provides a new control parameter for manipulating nonsequential double ionization.
  • The derived formula offers a novel and experimentally verifiable method to determine double ionization probability based on ellipticity.
  • This work advances the fundamental understanding of electron correlation in strong laser fields.