We report a study of the process of nonlinear Thomson scattering (NTS) of a tightly focused relativistically intense laser pulse by an ensemble of electrons simulating the result of ionisation of an ultrathin nanofoil. The description of all six components of a laser pulse is based on the Stratton – Chu integrals describing radiation focused by an off-axis parabolic mirror into a spot down to the diffraction limit, which is of practical interest for modern experiments with extreme-intensity lasers, including diagnostics of their parameters. The interaction of a laser pulse with electrons is simulated by the test-particle method, and the resulting trajectories are used to calculate the characteristics of secondary electromagnetic radiation. The effect of the laser-pulse focal spot diameter in the range λ – 6λ on the angular distributions of the radiated energy and NTS spectra, as well as of a laser-beam peak intensity of 10 21 –10 22 W cm -2 on the spect...

中文翻译：

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粒子集合对紧密聚焦的相对论强激光脉冲的非线性汤姆森散射

我们报告了通过电子集成模拟超薄纳米箔电离的结果，对紧密聚焦的相对论强激光脉冲的非线性汤姆逊散射（NTS）过程的研究。激光脉冲的所有六个分量的描述基于Stratton-Chu积分，描述了离轴抛物面反射镜聚焦到低至衍射极限的光斑，这对于使用高强度激光的现代实验具有实际意义，包括其参数的诊断。通过测试粒子方法模拟了激光脉冲与电子的相互作用，并使用所得的轨迹来计算二次电磁辐射的特性。