Mode conversion of large-amplitude electromagnetic waves in relativistic critical density plasmasT. C. Pesch and H.-J. Kull
Institute of Theoretical Physics A, RWTH Aachen University - Templergraben 55, 52056 Aachen, Germany, EU
received 14 November 2008; accepted in final form 18 December 2008; published January 2009
published online 22 January 2009
The propagation of linearly polarized large-amplitude electromagnetic waves in critical density plasmas is studied in the framework of the Akiezer-Polovin model. A new mechanism of mode conversion is presented. The well-known periodic solutions are generalized to quasiperiodic solutions taking into account additional electrostatic oscillations. Nearly periodic circle-like solutions are found to be stabilized by intrinsic mode coupling whereas for nearly periodic eight-like solutions an effective mode conversion mechanism is discovered. Finally, the modulation timescales are considered.
52.27.Ny - Relativistic plasmas.
52.38.-r - Laser-plasma interactions.
52.35.Mw - Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.).
© EPLA 2009