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Plasma density gratings induced by intersecting laser pulses in underdense plasmas
Donald Umstadter Publications
  • Z.-M. Sheng, Chinese Academy of Sciences, Beijing 100080, P.R. China
  • Jiandi Zhang, Chinese Academy of Sciences, Beijing
  • Donald Umstadter, University of Nebraska - Lincoln
Date of this Version
10-1-2003
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Published in Applied Physics B 77 (2003), pp. 673–680. Copyright © 2003 Springer-Verlag. Used by permission. http://www.springerlink.com/content/0946-2171

Abstract

Electron and ion density gratings induced by two intersecting ultrashort laser pulses at intensities of 1016 W/cm2 or lower are investigated. The ponderomotive force generated by the inhomogeneous intensity distribution in the intersecting region of the interfering pulses produces deep electron and ion density modulations at a wavelength less than a laser wavelength in vacuum. Dependence of the density modulation on the plasma densities, temperatures, and the ion mass, as well as the laser pulse parameters are studied analytically and by particle-in-cell simulations. It is found that the density peaks of such gratings can be a few times that of the initial plasma density and last as long as a few picoseconds. It is also demonstrated that the scattering of signal pulses by such a bulk density grating results in high-harmonic generation. The density gratings may be incorporated into ion-ripple lasers [K.R. Chen and J.M. Dawson, Phys. Rev. Lett. 68, 29 (1992)] to generate ultrashort X-ray pulses of a few angstroms by using electron beams at only a few tens of MeV only.

Citation Information
Z.-M. Sheng, Jiandi Zhang and Donald Umstadter. "Plasma density gratings induced by intersecting laser pulses in underdense plasmas" (2003)
Available at: http://works.bepress.com/donald_umstadter/11/