Abstract
The self-focusing and propagation of intense Gaussian laser beams in plasmas are investigated, and the explicit form of intensity of self-focused laser beams is derived without the use of WKB approximation. Propagation of self-focused laser beams in plasmas is strongly affected by Raman scattering and Brillouin scattering that are expected for hohlraum targets in inertial confinement fusion. The intensity of Raman and Brillouin scattered waves is derived in paraxial approximation where the effect of plasma temperature and Landau damping is considered through the kinetic theory of plasmas. The effect of plasma temperature and its density, as well as laser wavelength and its intensity, on self-focusing and spatial growth of scattered waves is considered.
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