径向极化laser束加速电子的傍轴近似的有效性
On the validity of the paraxial approximation for electron acceleration with radially polarized laser beams
摘要：
在激光驱动电子加速的研究中，通常采用傍轴波动光学的方法。利用Helmholtz方程的精确解及其傍轴对应方程，对高功率TM01电子束加速进行了数值模拟。对于束腰的大小，在该傍轴近似以前被认为是有效的，我们强调显着差异的角度发散和能量分布的电子束团所产生的精确和傍轴的解决方案。我们的结果表明，额外的照顾时，必须采取工作在傍轴近似的上下文中的电子加速径向偏振激光束。
英文摘要：
In the study of laser-driven electron acceleration, it has become customary to work within the framework of paraxial wave optics. Using an exact solution to the Helmholtz equation as well as its paraxial counterpart, we perform numerical simulations of electron acceleration with a high-power TM01 beam. For beam waist sizes at which the paraxial approximation was previously recognized valid, we highlight significant differences in the angular divergence and energy distribution of the electron bunches produced by the exact and the paraxial solutions. Our results demonstrate that extra care has to be taken when working under the paraxial approximation in the context of electron acceleration with radially polarized laser beams.
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