Numerical calculations of laser interaction with plasmas including momentum transfer of the nonlinear forces

In order to study the action of the nonlinear force of electrodynamic laser-plasma interaction without thermalization, numerical calculations with a very general two-fluid numerical code were performed including nonlinear variation of the optical constants (dependence of the collision frequency on the laser intensity) and detailed description of the reflection of laser radiation based on Maxwell's equations. For laser pulses of less than 1 psec, the dynamics are characterized by the nonlinear force mainly. using Rayleigh-like density profiles, the generation of instabilities as well as their suppression has been demonstrated. The energy transferred to two thick blocks of plasma (one moving against the laser light, the other with it under compensation of momentum) increases nearly quadratically on the laser intensity