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用几种不同的实验方法系统地研究了超短脉冲激光与固体靶相互作用产生的超热电子的行为 ,发现在 80 0nm ,5× 1 0 15 W/cm2 的激光与固体靶相互作用时 ,由于共振吸收的作用使产生的超热电子呈空间定向发射 ,发射的方向与等离子体对激光能量的吸收密切相关 ,同时超热电子的发射也与超热电子的电子能量有关 ,能量越高发散角越小 .超热电子的能谱显示超热电子的最大能量大于 5 0 0keV ,能谱结构呈双温Maxwell分布 .
Several different experimental methods were used to systematically study the behavior of the superheated electrons generated by the interaction between the ultrashort pulse laser and the solid target. It was found that when the laser at 5 × 10 15 W / cm 2 interacts with the solid target at 80 0 nm, Due to the resonance absorption effect, the generated hot electrons are spatially directed. The emission direction is closely related to the plasma absorption of the laser energy. Meanwhile, the emission of the hot electrons is also related to the electron energy of the hot electrons. The higher the energy, the higher the divergence The smaller the angle, the energy spectrum of the hot electron shows that the maximum energy of the hot electron is larger than 500 keV, and the energy spectrum shows a dual temperature Maxwell distribution.