激光脉冲初相位调制电子受激辐射后向对称性
The backward symmetry of the excited electron radiation modulated by the initial phase of laser pulse
投稿时间:2022-11-28  修订日期:2023-02-23
DOI:
中文关键词:  激光光学  电子辐射  数值模拟  非线性汤姆逊散射  线偏振
英文关键词:laser optics  electronic radiation  numerical simulation  nonlinear Thomson scattering  linear polarization
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
杨青屿 南京邮电大学 210023
王禹博 南京邮电大学 
曹逸飞 南京邮电大学 
田友伟* 南京邮电大学 210023
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中文摘要:
      为了研究线偏振超短超强激光脉冲中高能电子运动和辐射的后向对称性,基于经典非线性Thomson散射的框架,借助数值模拟软件绘制了电子轨迹、空间辐射能量的角分布和空间频率分布直方图。研究发现,当激光脉冲短至只有几个周期时,非线性Thomson散射受激光初始相位的影响十分显著,其能量空间分布和运动轨迹具有很强的相关性,并且相对于驱动激光的初始相位具有“三重对称”的特性。高次谐波频谱的截止可以达到1*10^6 ω0,而频谱峰值的对称性则可为实际激光参数的选择提供可行的思路。研究表明,通过激光脉冲包络调制获得理想的非线性Thomson后向散射空间辐射角分布和高次谐波幅度峰值是可行的。
英文摘要:
      To investigate the motion and radiation properties of high-energy electrons in ultrashort intensive laser pulses, the electron trajectory, the angular distribution of spatial radiation, and the histogram of the spatial frequency distribution is plotted with the aid of numerical simulation software, which is based on the framework of classical nonlinear Thomson scattering. According to the research, nonlinear Thomson scattering is significantly influenced by the initial phase of the laser when the laser pulse is only a few cycles long. Also, its trajectory and spatial energy distribution which have apparent correlations have a "triple-symmetric" property concerning the initial phase of driving laser. The cutoff of the high harmonic spectrum can reach 1×10^6ω0, and the symmetry of high harmonic amplitude peaks provides a feasible idea of the selection of laser parameters in actual experiments. The study also provides a viable approach to obtain the desired spatial angle distribution of radiation energy and high harmonic amplitude peak of inverse nonlinear Thomson scattering by initial phase modulation of the laser.
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