title: Nonlinear interaction of intense laser pulses and an inhomogeneous electron-positron-ion plasma.
abstract: The nonlinear interaction of an ultraintense short laser beam and an inhomogeneous electron-positron-ion (EPI) plasma is investigated. It is found that the presence of positrons and inhomogeneity results in strong modulational and filamentational instabilities, which induce strong nonlinear interactions between the laser beam and the inhomogeneous EPI plasma. Light beam focusing, filamentation, trapping, and nonlinear interaction between the trapped light spots and the inhomogeneous plasma are observed. Interestingly, we find that the inhomogeneity of the plasma can not only boost a mechanism for light beam self-focusing and filamentation but also provide an effective way to localize and trap the beam in the region one wanted.
authors.affiliation: College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou 730070, China.
authors.forename: Li-Hong
authors.initials: LH
authors.lastname: Cheng
authors.forename: Rong-An
authors.initials: RA
authors.lastname: Tang
authors.forename: Ai-Xia
authors.initials: AX
authors.lastname: Zhang
authors.forename: Ju-Kui
authors.initials: JK
authors.lastname: Xue
mesh_terms: D003198:Computer Simulation; D004583:Electrons; D007477:Ions; D007834:Lasers; D008956:Models, Chemical; D017711:Nonlinear Dynamics; D058626:Plasma Gases / Q000737:chemistry* / Q000528:radiation effects*
chemical_list: D007477:Ions; D058626:Plasma Gases