论文标题
免费电子激光生成X射线庞加莱梁
Free Electron Laser Generation of X-Ray Poincaré Beams
论文作者
论文摘要
提出了一种无光学方法，以通过自由电子激光器（FEL）的燃烧剂扩展（FEL）生成具有空间变化状态的X射线辐射。通过在两个连续的正交偏振下驱动器中从束的电子束辐射的不同相干横向光分布的重叠获得横平中极化的控制。通过在一个或两个下降器中发出较高的谐波来获得不同的横向剖面。该方法使其在具有可调波长的高功率下以其强度，相位和极化构造的光束生成。模拟用于证明具有空间不均匀极化的两种不同类别的光的产生 - 圆柱矢量梁和全庞加莱梁。
An optics-free method is proposed to generate X-ray radiation with spatially variant states of polarization via an afterburner extension to a Free Electron Laser (FEL). Control of the polarization in the transverse plane is obtained through the overlap of different coherent transverse light distributions radiated from a bunched electron beam in two consecutive orthogonally polarised undulators. Different transverse profiles are obtained by emitting at a higher harmonic in one or both of the undulators. This method enables the generation of beams structured in their intensity, phase, and polarization - so-called Poincaré beams - at high powers with tunable wavelengths. Simulations are used to demonstrate the generation of two different classes of light with spatially inhomogeneous polarization - cylindrical vector beams and full Poincaré beams.
