Dual-picosecond-laser-driven generation of MV/m giant electromagnetic pulses

The mechanisms governing generation and amplification of laser-driven electromagnetic pulses (EMPs) in the picosecond (ps) regime remain insufficiently understood.Here, we present a unified theoretical and experimental framework that demonstrates dual-picosecond-laser irradiation of solid targets can synergistically enhance EMP emission.By integrating particle-incell simulations with three-dimensional electromagnetic modeling, we reveal the increasing laser focal power density amplifies hot electron emission and strengthens neutralization currents, leading to giant EMP radiations.Experimentally, we validate these predictions at the XG-III and SG-II U picosecond petawatt laser facility, achieving a record-breaking EMP field strength of 3.08 MV/m-substantially exceeding previously reported values from ps-laser-solid interactions.