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Realizing the full potential of ultrahigh-intensity lasers for particle andradiation generation will require multi-beam arrangements due to technologylimitations. Here, we investigate how to optimize their coupling with solidtargets. Experimentally, we show that overlapping two intense lasers in amirror-like configuration onto a solid with a large preplasma can greatlyimprove the generation of hot electrons at the target front and ionacceleration at the target backside. The underlying mechanisms are analyzedthrough multidimensional particle-in-cell simulations, revealing that theself-induced magnetic fields driven by the two laser beams at the target frontare susceptible to reconnection, which is one possible mechanism to boostelectron energization. In addition, the resistive magnetic field generatedduring the transport of the hot electrons in the target bulk tends to improvetheir collimation. Our simulations also indicate that such effects can befurther enhanced by overlapping more than two laser beams.

Optimizing laser coupling, matter heating, and particle acceleration from solids using multiplexed ultraintense lasers