论文标题
揭示非线性康普顿散射的横向形成长度
Unveiling the transverse formation length of nonlinear Compton scattering
论文作者
论文摘要
电磁辐射的发射过程不会立即发生，而是在被称为辐射形成时间的有限时间内“形成”。在超偏态性方案中，相应的（纵向）形成长度由形成时间时间给出，光的速度并控制辐射的几个特征。在这里，我们通过通过对\ emph {Flying focus}激光束进行反向传播的电子来调查非线性康普顿散射来阐明横向形成长度（TFL）的重要性。 TFL与辐射形成“体积”的横向大小有关，与纵向形成长度不同，具有量子。作为通常认为任何激光场大致均匀的compton波长阶的TFL，相关的量子干扰效应已被忽略。但是，我们分析表明，如果以$ n_l \ gg 1 $循环的速度以光和向后移动的焦点束相对于梁传播方向移动，则TFL的效果与$ N_L $成比例的增强相比，并且可能会实质上改变可行的飞行焦点的差异可能性。
The process of emission of electromagnetic radiation does not occur instantaneously but it is "formed" over a finite time known as radiation formation time. In the ultrarelativistic regime, the corresponding (longitudinal) formation length is given by the formation time times the speed of light and controls several features of radiation. Here, we elucidate the importance of the transverse formation length (TFL) by investigating nonlinear Compton scattering by an electron initially counterpropagating with respect to a \emph{flying focus} laser beam. The TFL is related to the transverse size of the radiation formation "volume" and, unlike the longitudinal formation length, has a quantum origin. Being the TFL typically of the order of the Compton wavelength, where any laser field can be assumed to be approximately uniform, related quantum interference effects have been ignored. However, we show analytically that if the focus in a flying focus beam with $n_L\gg 1$ cycles moves at the speed of light and backwards with respect to the beam propagation direction, the effects of the TFL undergo a large enhancement proportional to $n_L$ and may substantially alter the differential emission probability for feasible flying focus pulses.
