在超短超强激光与固体薄膜靶相互作用研究中,实验上首次观测到了沿靶面方向发射的高能超热电子束。该电子束只有在等离子体电子密度标长较短的条件下才会出现。理论模拟表明,靶表面电磁场的约束作用是产生此电子束的主要原因。这一结果有助于加深对激光惯性约束聚变快点火实验中的锥靶物理过程的理解,并有潜在的应用前景。 In the study of the interaction between ultrashort superlattice laser and solid thin film, the first high-energy superheated electron beam emitted along the direction of the target was observed experimentally. The electron beam only in the plasma electron density of the shorter length of the standard will appear. The theoretical simulation shows that the restraint effect of the electromagnetic field on the target surface is the main reason for generating this electron beam. This result helps to deepen the comprehension of cone target physics in fast inertia confinement fusion ignition experiment and has potential application prospects.