Thomson scattering and ponderomotive intermodulation within standing laser beat waves in plasma

Scott Sepke, Y. Y. Lau, James Paul Holloway, Donald Umstadter

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Electrons in a standing electromagnetic wave-an optical lattice-tend to oscillate due to the quiver and ponderomotive potentials. For sufficiently intense laser fields (Iλ2 5×1017Wcm-2μm2) and in plasmas with sufficiently low electron densities (n 1018cm-3), these oscillations can occur faster than the plasma can respond. This paper shows that these oscillations result in Thomson scattering of light at both the laser and ponderomotive bounce frequencies and their harmonics as well as at mixtures of these frequencies. We term this mixing ponderomotive intermodulation. Here, the case of counterpropagating laser beams creating a one-dimensional (1D) optical lattice is analyzed. The near-equilibrium electron orbits and subsequent Thomson scattering patterns are computed in the single-particle limit. Scaling laws are derived to quantify the range of validity of this approach. Finally, collective plasma and laser focusing effects are included by using particle-in-cell (PIC) techniques. This effect resulting in light-frequency conversion has applications both as an infrared light source and as a means to diagnose high laser intensities inside dense plasmas.

Original languageEnglish (US)
Article number026501
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume72
Issue number2
DOIs
StatePublished - Aug 1 2005

Fingerprint

intermodulation
Thomson scattering
Beat
synchronism
Plasma
Scattering
Laser
Optical Lattice
particle in cell technique
Electron
lasers
oscillations
frequency converters
dense plasmas
Oscillation
Frequency Conversion
scaling laws
high power lasers
Bounce
Quiver

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

Cite this

Thomson scattering and ponderomotive intermodulation within standing laser beat waves in plasma. / Sepke, Scott; Lau, Y. Y.; Holloway, James Paul; Umstadter, Donald.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 72, No. 2, 026501, 01.08.2005.

Research output: Contribution to journalArticle

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