Device and method for generating orbital angular momentum for polarization modulation of orbital angular momentum

摘要

The present invention provides an apparatus and method for generating orbital angular momentum for polarization modulation of orbital angular momentum. The generating device includes a Gaussian light source module, a first orbital angular momentum modulation module, a second orbital angular momentum modulation module, and a multiplexing module. In operation, the Gaussian light source module generates a Gaussian beam of an arbitrary polarization state, enters the multiplexing module, and the multiplexing module decomposes the Gaussian beam into two polarization components: a horizontal polarization direction and a vertical polarization direction, respectively, a first or a first 2 Introduce orbital angular momentum modulation module. The modulation module performs polarization-independent orbital angular momentum modulation on two components, respectively, and the two modulated light components are returned to the multiplexing module. The multiplexing module superimposes the two components of light, and finally outputs the orbital angular momentum state or the superposition state. The orbital angular momentum generating device has a compact structure and a relatively low manufacturing cost. The required devices and technologies are relatively mature, allowing the generation of orbital angular momentum states and superposition states of arbitrary topological charges at high speed, and the speed can reach the MHz level.