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Relativistic mirrors can be realized with strongly nonlinear Langmuir wavesexcited by intense laser pulses in underdense plasma. On reflection from therelativistic mirror the incident light affects the mirror motion. Thecorresponding recoil effects are investigated analytically and withparticle-in-cell simulations. It is found that if the fluence of the incidentelectromagnetic wave exceeds a certain threshold, the relativistic mirrorundergoes a significant back reaction and splits into multiple electron layers.The reflection coefficient of the relativistic mirror as well as the factors ofelectric field amplification and frequency upshift of the electromagnetic waveare obtained.

Recoil Effects on Reflection from Relativistic Mirrors in Laser Plasmas