Fig. 1
Schematic setup of the proposed two-driver pulses ReMPI scheme. An ultraintense pulse from a Ti:Sa system is spatially and temporally split by using an in-built multi-ring delay mask with a mirror in the inner core (A). The multi ring structures in the delay mask generates two multi-ring structured pulses (a1), separated by a time delay given by the plasma oscillation period for the working plasma density. The double pulse is converted in circular polarization via a \(\lambda /4\) plate (B) and focused on the target through an F/38 off-axis parabola (a3). The inner part of the main pulse is reflected by the pick-off mirror (C) and frequency tripled with LBO and BBO crystals. After passing through a delay line (c3), the ionization pulse is expanded in diameter via a telescope (c4) and focused on the target through a dedicated F/13 parabola and a mirror with a hole (c5).
