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研究了超短脉冲圆极化激光场的一阶修正场,通过数值计算,探讨了入射电子的动力学特性,发现了超短脉冲圆极化激光场中的加速现象。通过研究电子的动力学特性与脉宽的关系发现,近轴近似方程在利用1/ω归一化后,脉宽τ0≤30时(ω为激光频率),仍然适用;而在脉宽τ0>30时,近轴近似方程与一阶修正方程的计算结果出现偏离。在事例功τ0=100和τ0=300中,采用一阶修正场方程,研究了电子束团的能量分布与空间分布的特征,发现在脉宽τ0=300的情况下,加速电子数目增多,而且电子束能够发生汇集。
The first order correction field of ultrashort pulse circularly polarized laser field is studied. The dynamic characteristics of the incident electrons are discussed by numerical calculation. The accelerating phenomenon in the ultrashort pulse circularly polarized laser field is found out. By studying the relationship between the electron dynamics and the pulse width, it is found that the paraxial approximation equation is still applicable when the pulse width τ0≤30 (ω is the laser frequency) after normalized by 1 / ω. However, when the pulse width τ0> At 30 o’clock, the near-axis approximation equation deviates from the first-order correction equation. In the case of τ0 = 100 and τ0 = 300, the first-order modified field equation is used to study the energy distribution and spatial distribution characteristics of the electron bunch. It is found that the number of accelerating electrons increases with the pulse width τ0 = 300, and Electron beams can converge.