Chapter

Fringe 2005

pp 46-53

Experimental Study of Coherence Vortices: Birth and Evolution of Phase Singularities in the Spatial Coherence Function

  • Wei WangAffiliated withDept. of Info. & Comm. Engg., The University of Electro-Communications
  • , Zhihui DuanAffiliated withDept. of Info. & Comm. Engg., The University of Electro-Communications
  • , Steen G. HansonAffiliated withDept. for Optics and Plasma Research, OPL-128, Risoe National Laboratory
  • , Yoko MiyamotoAffiliated withDept. of Info. & Comm. Engg., The University of Electro-Communications
  • , Mitsuo TakedaAffiliated withDept. of Info. & Comm. Engg., The University of Electro-Communications

Conclusions

In summary, we have presented evidence of coherence vortices for the first time and experimentally investigated the properties of phase singularities in the coherence function. Unlike for conventional optical vortices, the intensity for coherence vortices does not vanish, but their contrasts become zero. Furthermore, the proposed method for synthesizing coherence vortices faciliates direct observation of the detailed local properties of an coherence vortex, and introduces new opportunities to explore other topological phenomena for the coherence function.