The splitted laser beam filamentation in interaction of laser and an exponential decay inhomogeneous underdense plasma

Xia, Xiongping; Xu, Bin; Lu, Jianduo; Yi, Lin
October 2011
Physics of Plasmas;Oct2011, Vol. 18 Issue 10, p102106
Academic Journal
The splitted beam filamentation in interaction of laser and an exponential decay inhomogeneous underdense plasma is investigated. Based on Wentzel-Kramers-Brillouin (WKB) approximation and paraxial/nonparaxial ray theory, simulation results show that the steady beam width and single beam filamentation along the propagation distance in paraxial case is due to the influence of ponderomotive nonlinearity. In nonparaxial case, the influence of the off-axial of α00 and α02 (the departure of the beam from the Gaussian nature) and S02 (the departure from the spherical nature) results in more complicated ponderomotive nonlinearity and changing of the channel density and refractive index, which led to the formation of two/three splitted beam filamentation and the self-distortion of beam width. In addition, influence of several parameters on two/three splitted beam filamentation is discussed.


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