A new near-infrared direct acceleration mechanism driven by Laguerre–Gaussian laser is proposed to stably accelerate and concentrate electron slice both in longitudinal and transversal directions in vacuum. Three-dimensional simulations show that a 2-μm circularly polarized ${\mathrm{LG}}_p^l$ (p = 0, l = 1, σz = −1) laser can directly manipulate attosecond electron slices in additional dimensions (angular directions) and give them annular structures and angular momentums. These annular vortex attosecond electron slices are expected to have some novel applications such as in the collimation of antiprotons in conventional linear accelerators, edge-enhancement electron imaging, structured X-ray generation, and analysis and manipulation of nanomaterials.

提出了一种新的由拉盖尔-高斯激光驱动的近红外直接加速机制，以在真空中在纵向和横向两个方向上稳定地加速和集中电子切片。三维模拟表明，2-μm 圆极化${\mathrm{LG}}_p^l$ ( p  = 0, l  = 1, σ z = -1) 激光可以直接在附加维度（角方向）上操纵阿秒电子切片，并赋予它们环形结构和角动量。这些环形涡旋阿秒电子切片有望在传统直线加速器中的反质子准直、边缘增强电子成像、结构化 X 射线生成以及纳米材料的分析和操作等方面具有一些新的应用。