Entanglement laser mode of optical vortex array and space-inhomogeneous polarization generated from combining vector vortex beam and mode-converter

Teng-De Huang^1*, Ting-Hua Lu¹

¹Department of Physics, National Taiwan Normal University, Taipei, Taiwan

* Presenter:Teng-De Huang, email:tengdeh@gmail.com

We proposed an efficient and practical method to generate the entanglement laser mode of optical vortex array and space-inhomogeneous polarization by applying the phase retarders, the spatial light modulator (SLM), the vortex phase plates (VPPs) and a "π/2" mode-converter. The optical vortex array-inhomogeneous entanglement laser mode is emerging from the superposition of two opposite order of Laguerre-Gaussian (LG) or Hermite-Gaussian (HG) modes and two opposite handedness of circular polarization in VPPs and "π/2" mode-converter. The entanglement laser mode leads to the formation of complex phase singularities and light interference. We experimentally demonstrate that different entanglement laser modes with different arrangements of optical vortex position by using simple setup. Moreover, the SLM provides an extra degree of freedom to manipulate the entanglement laser mode. This method is expected to provide high order vortex array with space-inhomogeneous polarization and pave the way for optical entanglement and light source.

Keywords: vector beam, polarization, optical vortex, optical entanglement