Efficient electron acceleration by a linearly chirped ultrashort laser pulse in vacuum is investigated using the particle swarm optimization method. By applying this method for optimizing the initial parameters of the laser pulse, a pronounced increase in final energy gain of the electron is obtained compared to that expected from the successive optimization method. Our results also suggest that the value of the optimal chirp parameter is independent of laser polarization and the energy gain could be insensitive to the sign of this parameter when the initial phase is optimally adjusted. In addition, utilizing the chirped laser pulse with optimized conditions for acceleration of an electron bunch reveals that the energy spectrum is shifted to considerably higher energies and the spatial distribution is significantly improved in a polarization-dependent manner.

中文翻译：

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用粒子群方法优化啁啾超短激光脉冲在真空中的电子加速度

使用粒子群优化方法研究了真空中线性啁啾超短激光脉冲的有效电子加速。通过应用这种方法来优化激光脉冲的初始参数，与连续优化方法所预期的相比，获得了电子最终能量增益的显着增加。我们的结果还表明，最佳啁啾参数的值与激光偏振无关，并且当初始相位得到最佳调整时，能量增益可能对该参数的符号不敏感。此外，