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采用飞秒激光与金属薄膜靶相互作用,测量了激光以不同入射角入射时快电子前向发射的分布,并用2D PIC进行了模拟.结果显示,快电子主要集中于靶背法线附近区域发射,这与模拟的结果基本一致;20°入射时,快电子数目和最大动能达到极大,理论分析和模拟结果显示此时共振吸收最强,快电子最大动能达2MeV;60°入射时,发现快电子沿靶面方向发射,这是由于靶面准静态电磁场的缘故.
The interaction between femtosecond laser and metal thin film target was used to measure the distribution of the forward electron emission when the laser was incident with different incident angles and the 2D PIC was used to simulate it. The results show that the fast electron mainly focused on the area near the normal , Which is consistent with the simulation results. The number of fast electrons and the maximum kinetic energy at 20 ° incidence are extremely large. The theoretical analysis and simulation results show that the resonance absorption is the strongest at this time, and the maximum kinetic energy of the fast electrons reaches 2 MeV. At 60 ° incidence, Fast electrons are emitted in the direction of the target surface due to the quasi-static electromagnetic field of the target surface.