Dynamics of laser beams in inhomogeneous electron–positron–ion plasmas*
Cheng Li-Hong, Tang Rong-An, Du Hong-E, Xue Ju-Kui†
       
(a) Potential profile of V ( a , ξ ) versus a and ξ in inhomogeneous case for n i 0( ξ ) = exp[−( ξ − d )2/40000, d = 100, and N = 11. (b) Potential profile of V ( a , ξ ) versus a for different characteristic inhomogeneity parameters d = 0, 50, 100 at fixed position ξ = 10.