WAKE-FIELD EFFECT INDUCED BY LASER MULTIPLE PULSES

Using a one-dimensional analysis, the maximum amplitude of the plasma wave induced by a series of square-shaped pulses is analytically calcu lated for ultraintense laser irradiances. The low-laser amplitude caw allows us to recover the beat-wave concept and shows equivalence of th e final wake-wave amplitude for one pulse and for a series of pulses w ith the same power. Large laser amplitudes show the inefficiency of th e usual beat-wave process and indicate the need for laser pulses with delays adapted to the wake generation via wake-phase-locked pulses.