紧聚焦激光脉冲中电子运动及辐射的时间演化特性
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作者单位:

1.南京邮电大学 贝尔英才学院;2.南京邮电大学 理学院

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中图分类号:

O411.3

基金项目:

中国国家自然科学基金(编号10947170/A05和11104291)


Time evolution properties of electron motion and radiation in tightly focused laser pulses
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Affiliation:

1.NJUPT Bell Honors School;2.Nanjing University of Posts and Telecommunications Bell Honors School;3.Nanjing University of Posts and Telecommunications College of Science

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    摘要:

    本研究使用Lagrange -Gaussian模型,研究了非线性汤姆逊散射的辐射特性。通过分析和实验,我们得到了激光场中单个电子的空间运动轨迹和生成的三维辐射数据。结果表明,在固定工作波长、束腰半径和脉宽的条件下,紧聚焦线偏振激光场中的电子在x-z平面上呈现“之”字形的震荡运动,x轴上存在最大位移值。我们还首次采用了分时间点观测方法,观察到激光与电子相互作用后的三维辐射变化。我们发现归一化辐射能量随着归一化时间的增加呈现不同的增长速率。此外,在激光场中观察到归一化峰值能量的角度Φ和θ并非固定,只有当归一化峰值能量趋于最大值1.45亿时,观察角度才固定。这些结果对于理解非线性汤姆逊散射以及推动光学实验室中X/γ射线生成的研究具有重要意义。

    Abstract:

    In this study, the radiation characteristics of nonlinear Thomson scattering were investigated using the Lagrange-Gaussian model. Through analysis and experiments, we obtained the spatial motion trajectories of individual electrons within the laser field and generated three-dimensional radiation data. The results indicate that, under the conditions of a fixed operating wavelength, waist radius, and pulse width, electrons within a tightly focused linearly polarized laser field exhibit oscillatory motion in the x-z plane, forming a "zigzag" pattern, with the maximum displacement along the x-axis. Additionally, for the first time, we employed a time-resolved observation method to observe the three-dimensional radiation changes resulting from the interaction between the laser and electrons. We found that the normalized radiation energy exhibits different growth rates as the normalized time increases. Furthermore, within the laser field, the angles Φ and θ of the normalized peak energy are not fixed; only when the normalized peak energy tends towards its maximum value of 1.45 hundred million do the observation angles become fixed. These results are of significant importance for understanding nonlinear Thomson scattering and advancing research on X/γ-ray generation in optical laboratories.

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历史
  • 收稿日期:2023-03-12
  • 最后修改日期:2023-06-11
  • 录用日期:2023-06-27
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