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