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The interactions between ultrahigh intense laser and overdense plasmas were investigated by the use of a 1-1/2 dimensional electromagnetic relativistic particle-in-cell code, EMPAC. When the effective electron plasma frequency is reduced below the laser frequency by increasing the inertial electron mass due to the relativistic effect, the ultrahigh intense short pulse laser can penetrate the overdense plasma, but is completely reflected after propagating to a certain extent, except for adoi:10.1585/pfr.2.026 fatcat:eauok4dvhze65phvwgag74drhq