Abstract
Relativistic laser-plasma interaction is one of the more active topics in recent plasma physics. In this paper, the laser-plasma interactions in underdense plasmas are explained briefly, and the related experimental results and numerical simulations are introduced. Several characteristic phenomena, including relativistic self-focusing, nonlinear laser wake field, nonlinear parametric scattering and so on, are analyzed using a quasi-static approximation model. However, this model does not provide sufficient understanding of complex interactions including the kinetic effect. Numerical simulation is an important and effective method for further analyzing relativistic particle dynamics.
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