The Influence of Plasma Defocusing in High Harmonic Generation

  • Chien-Jen LaiEmail author
  • Kyung-Han Hong
  • Franz X. Kärtner
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 125)


We numerically investigate the influence of plasma defocusing in high harmonic generation (HHG) by solving the first-order wave equation in an ionized medium. To quantitatively analyze of the influence of plasma defocusing, we define an enhancement factor that considers the macroscopic propagation effects including phase-matching and reabsorption. While degrading the driver pulse intensity, plasma also has a strong impact on HHG phase-matching and efficiency. With the aid of the scaling relation between the single atom efficiency and the HHG driver wavelength, our results give an estimate of HHG efficiencies with different driver wavelengths and show a limited HHG efficiency in high density media.


Enhancement Factor Geometric Phase High Harmonic Generation Retarded Time Free Electron Density 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Chien-Jen Lai
    • 1
    Email author
  • Kyung-Han Hong
    • 1
  • Franz X. Kärtner
    • 1
    • 2
  1. 1.Department of Electrical Engineering and Computer Science and Research Laboratory of ElectronicsMassachusetts Institute of TechnologyCambridgeUSA
  2. 2.Center for Free-Electron Laser Science, DESY, and Department of PhysicsUniversity of HamburgHamburgGermany

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