Radial electron plasma oscillations excited by a laser wake held are measured by frequency domain interferometry. In the nonlinear regime we observe two important effects: (i) an increase of the oscillation frequency and (ii) the damping of the oscillation in a few plasma periods. Simulations show that this last effect is related to the presence of a steep radial density gradient near the focus edge.
Frequency Increase and Damping of Nonlinear Electron Plasma Oscillations in Cylindrical Symmetry
Chessa P.;
1997
Abstract
Radial electron plasma oscillations excited by a laser wake held are measured by frequency domain interferometry. In the nonlinear regime we observe two important effects: (i) an increase of the oscillation frequency and (ii) the damping of the oscillation in a few plasma periods. Simulations show that this last effect is related to the presence of a steep radial density gradient near the focus edge.File in questo prodotto:
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