Generation of arbitrary cylindrical vector beams on the higher order   Poincare sphere
  We propose and experimentally demonstrate a novel interferometric approach to generate arbitrary cylindrical vector beams on the higher order Poincare sphere. Our scheme is implemented by collinear superposition of two orthogonal circular polarizations with opposite topological charges. By modifying the amplitude and phase factors of the two beams, respectively, any desired vector beams on the higher order Poincare sphere with high tunability can be acquired. Our research provides a convenient way to evolve the polarization states in any path on the high order Poincare sphere. 
Shizhen Chen, Xinxing Zhou, Yachao Liu, Xiaohui Ling, Hailu Luo, and   Shuangchun Wen
physics.optics