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Topological Properties of Spatial Coherence Function |
REN Ji-Rong;ZHU Tao;DUAN Yi-Shi |
Institute of Theoretical Physics, Lanzhou University, Lanzhou 730000 |
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Cite this article: |
REN Ji-Rong, ZHU Tao, DUAN Yi-Shi 2008 Chin. Phys. Lett. 25 367-370 |
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Abstract The topological properties of the spatial coherence function are investigated rigorously. The phase singular structures (coherence vortices) of coherence function can be naturally deduced from the topological current, which is an abstract mathematical object studied previously. We find that coherence vortices are characterized by the Hopf index and Brouwer degree in topology. The coherence flux quantization and the linking of the closed coherence vortices are also studied from the topological properties of the spatial coherence function.
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Keywords:
03.65.Vf
42.25.Kb
02.40.Xx
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Received: 28 August 2007
Published: 30 January 2008
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