Relativistic and charge-displacement self-channeling of intense ultrashort laser pulses in plasmas
- 1 April 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 45 (8) , 5830-5845
- https://doi.org/10.1103/physreva.45.5830
Abstract
A simple derivation in the Coulomb gauge of the nonlinear Schrödinger equation describing propagation of powerful ultrashort circularly polarized laser pulses in underdense cold inhomogeneous plasmas is presented. Numerical solutions are given for the two-dimensional axisymmetric case for both initially homogeneous plasmas and static preformed plasma columns. These solutions account for (i) diffraction, (ii) refraction arising from variations in the refractive index due to the spatial profile of the electron density distribution, (iii) the relativistic electronic mass shift, and (iv) the charge displacement resulting from the transverse ponderomotive force. The most important spatial modes of propagation corresponding to (1) purely relativistic focusing and (2) the combined action of both the relativistic and charge-displacement mechanisms are described. The latter leads to the formation of stable confined modes of propagation having paraxially localized regions of high intensity and corresponding paraxially situated cavitated channels in the electron density. It is further demonstrated that the dynamical solutions of the propagation tend asymptotically to the lowest eigenmodes of the governing nonlinear Schrödinger equation. Finally, the calculations illustrate the dynamics of the propagation and show that the relativistic mechanism promotes the initial concentration of the radiative energy and that the subsequent charge displacement stabilizes this confinement and produces waveguidelike channels.Keywords
This publication has 28 references indexed in Scilit:
- Laser beat wave in a relativistic plasmaJournal of Plasma Physics, 1990
- Nonlinear wake-field generation and relativistic focusing of intense laser pulses in plasmasPhysics of Fluids B: Plasma Physics, 1990
- Nonlinear theory of intense laser-plasma interactionsPhysical Review Letters, 1990
- Nonlinear interaction of intense laser pulses in plasmasPhysical Review A, 1990
- Kinetic energy distributions of ionic fragments produced by subpicosecond multiphoton ionization ofPhysical Review A, 1989
- Rare-gas electron-energy spectra produced by collision-free multiquantum processesPhysical Review A, 1986
- Collision-free multiple photon ionization of atoms and molecules at 193 nmPhysical Review A, 1985
- Plasma-wave generation in the beat-wave acceleratorPhysical Review A, 1985
- Relativistic motion of a charged particle in a plane electromagnetic wave with arbitrary amplitudeJournal of Physics A: General Physics, 1976
- Classical Theory of the Scattering of Intense Laser Radiation by Free ElectronsPhysical Review D, 1970