O'Dwyer D P, Phelan C F, Rakovich Y P, Eastham P R, Lunney J G, Donegan J F
School of Physics, Trinity College Dublin, Dublin 2, Ireland.
Opt Express. 2011 Jan 31;19(3):2580-8. doi: 10.1364/OE.19.002580.
Internal conical diffraction produces a superposition of orthogonally polarised zero- and first-order Bessel like beams from an incident circularly polarised Gaussian beam. For right-circularly polarised light, the first-order beam has an optical vortex of charge -1. Upon propagation of the first-order beam through a second biaxial crystal, a process which is termed cascade conical refraction, the generated beam is a superposition of orthogonally polarised fields of charge 0 and -1 or 0 and -2. This spin to orbital angular momentum conversion provides a new method for the generation and annihilation of optical vortices in an all-optical arrangement that is solely dependent on the incident polarisation and vortex handedness.
内圆锥衍射会使入射的圆偏振高斯光束产生正交偏振的零阶和一阶类贝塞尔光束的叠加。对于右旋圆偏振光，一阶光束具有电荷为 -1 的光学涡旋。当一阶光束通过第二个双轴晶体传播时，这个过程被称为级联圆锥折射，所产生的光束是电荷为 0 和 -1 或 0 和 -2 的正交偏振场的叠加。这种自旋到轨道角动量的转换为全光装置中光学涡旋的产生和湮灭提供了一种新方法，该方法仅取决于入射偏振和涡旋手性。
