[2] Kurki-Suonio T,Morrison P J,Tajima T,et al.Self-focusing of an optical beam in plasma.Phys Rev A,1989,40(6):3230～3239

[4] Chen X L ,Sudan R N .Two dimensional self-focusing of short intense laser pulse in under-dense plasma.Phys Fluids B,1993,5(4):1336～1348

[5] Bardsley J N,Penetrante B M, Mittleman M H.Relativistic of electrons in intense laser fields.Phys Rev A ,1989,40(7):3823～3835