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文章研究了单脉冲和多脉冲飞秒激光和水等离子体相互作用产生的高能电子特性 ,发现多脉冲激光构型可以大幅度地增强超热电子的产生和提高其温度 .实验观测到在激光偏振面内 ,沿与激光轴反向夹角 4 6°的方向 ,对称地喷射出两束能量大于 2 5keV的高能电子 .二维粒子模拟结果和实验符合很好 .实验和理论都表明 ,这些超热电子是通过后续脉冲与前面脉冲形成的球形液滴相互作用产生的 ,具体机制为共振吸收 .
In this paper, we study the high-energy electronic properties produced by the interaction between single-pulse and multi-pulse femtosecond laser and water plasma and find that the multi-pulse laser configuration can greatly enhance the generation of superheated electrons and increase their temperature. In the plane of the laser, two beams of energetic electrons with energies greater than 25 keV are symmetrically emitted in the direction of the opposite angle of the laser axis by 46 °. The two-dimensional particle simulation results are in good agreement with the experiments. Experiments and theories show that these super Hot electrons are generated by the interaction of subsequent pulses with the spherical droplets formed by the preceding pulse. The specific mechanism is resonance absorption.