Stimulated Raman backscattering of laser radiation in deep plasma channels

Details Stimulated Raman backscattering of laser radiation in deep plasma channels Stimulated Raman backscattering of laser radiation in deep plasma channels

2004-05-21

arxiv.org/abs/physics/0405114v1

Physics of Plasmas, Vol. 11, No. 10, pp. 4686-4694 (2004)

Physics

Plasma Physics

11 pages, 3 figures; submitted to Physics of Plasmas

Scientific paper

10.1063/1.1778743

Stimulated Raman backscattering (RBS) of intense laser radiation confined by a single-mode plasma channel with a radial variation of plasma frequency greater than a homogeneous-plasma RBS bandwidth is characterized by a strong transverse localization of resonantly-driven electron plasma waves (EPW). The EPW localization reduces the peak growth rate of RBS and increases the amplification bandwidth. The continuum of non-bound modes of backscattered radiation shrinks the transverse field profile in a channel and increases the RBS growth rate. Solution of the initial-value problem shows that an electromagnetic pulse amplified by the RBS in the single-mode deep plasma channel has a group velocity higher than in the case of homogeneous-plasma Raman amplification. Implications to the design of an RBS pulse compressor in a plasma channel are discussed.

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