Electromagnetic waves, in addition to the energy and momentum, can also carry an orbital angular momentum (OAM). Transfer of these quantities from laser to particles may find various applications. There are similarities between the process of OAM transfer from laser to electrons and a direct electron acceleration in a relativistic electromagnetic wave packet. In this paper, by using a numerical integration of electron’s equation of motion, we present a general analysis of the energy and momentum transfer from a laser wave packet carrying orbital angular momentum to electrons. The theoretical model demonstrates that relation between the transfer of the axial and orbital angular momenta from laser to electrons depends strongly on the laser waveform and polarization.

电磁波除能量和动量外，还可以携带轨道角动量（OAM）。这些量从激光到颗粒的转移可能有多种应用。OAM从激光到电子的转移过程与相对论电磁波包中的直接电子加速度之间存在相似之处。在本文中，通过使用电子运动方程的数值积分，我们对从携带轨道角动量的激光波包到电子的能量和动量传递进行了一般分析。理论模型表明轴向和轨道角动量从激光到电子的转移之间的关系在很大程度上取决于激光波形和偏振。