标题： 相对论振荡窗口由强拉盖尔高斯激光脉冲驱动 显示英文标题

标题： Relativistic Oscillating Window Driven by an Intense Laguerre Gaussian Laser Pulse

摘要： 高阶谐波通过强拉盖尔-高斯（LG）激光束通过小孔的衍射生成被研究。发现边缘上的二维外围电子动力学可以促进自旋和轨道角动量相互作用之间的复杂相互作用，这导致了不同极化状态的LG脉冲有不同的选择规则。特别是当驱动器是线性极化时，谐波光束不再遵循简单的轨道角动量守恒规则。相反，在每个谐波光束中产生多个具有不同拓扑电荷的LG模式，模式的数量等于谐波阶数。推导出一种理论并通过模拟进行了验证，该理论可以预测不同极化状态的LG驱动器的谐波拓扑电荷及其相对强度。我们的工作为非线性光学中光的行为提供了基本见解，并为产生可控制轨道角动量的高强度紫外或X射线脉冲铺平了道路，这些脉冲可以作为各种科学领域前沿的多功能工具。 显示英文摘要

摘要： High-order harmonic generation by the diffraction of an intense Laguerre-Gaussian (LG) laser beam through a small aperture is studied. It is found that the 2D peripheral electron dynamics on the rim can facilitate complex interplay between the spin and orbital angular momentum interaction, which leads to distinct selection rules for LG pulses with different polarization states. In particular, when the driver is linearly polarized, the harmonic beams no longer follow a simple orbital angular momentum conservation rule. Instead, multiple LG modes with different topological charges are produced in each harmonic beam, and the number of modes equals to the harmonic order. A theory is derived and validated by simulations, which can predict the harmonic topological charges as well as their relative intensities for LG drivers with different polarization states. Our work provides fundamental insight into the behavior of light in nonlinear optics, and paves the way towards high-intensity UV or X-ray pulses carrying controllable OAM, that can serve as versatile tools at frontiers of various scientific fields.