Relativistic two-plasmon excitation by a laser near the critical layer in a plasma
Physics Department, Samrat Ashok Technological Institute, Vidisha (MP) 464001, India
2 Center for Energy Studies, Indian Institute of Technology - New Delhi, 110016, India
Accepted: 24 July 1998
An intense laser incident on a plasma relativistically modulates the electron mass at the second harmonic. Near the critical layer, the oscillatory mass couples two oppositely propagating Langmuir waves which grow at a rate , where is the plasma frequency, v0 is the oscillatory electron velocity and c is the velocity of light in vacuum. The decay is accompanied by the excitation of a low-frequency mode which at large wave number enhances the growth rate of the two-plasmon process.
PACS: 52.40.Nk – Laser-plasma interactions (e.g., anomalous absorption, backscattering, magnetic field generation, fast particle generation) / 52.35.Mw – Nonlinear waves and nonlinear wave propagation (including parametric effects, mode coupling, ponderomotive effects, etc.)
© EDP Sciences, 1998