A novel measuring method for arbitrary optical vortex by three spiral spectra

In this letter, the topological charge of non-integer vortices determined by three arbitrary spiral spectra is theoretically demonstrated for the first time. Based on the conclusion, a novel method to measure non-integer vortices is presented. This method is applicable not only to arbitrary non-inte...

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Bibliographic Details
Published in:Physics letters. A 2017-02, Vol.381 (8), p.817-820
Main Authors: Ni, Bo, Guo, Lana, Yue, Chengfeng, Tang, Zhilie
Format: Article
Language:English
Subjects:
Non-integer vortices
Quantum optic
Spectrum analysis
Spiral spectra
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Summary:In this letter, the topological charge of non-integer vortices determined by three arbitrary spiral spectra is theoretically demonstrated for the first time. Based on the conclusion, a novel method to measure non-integer vortices is presented. This method is applicable not only to arbitrary non-integer vortex but also to arbitrary integer vortex. •Different non-integer vortices cannot have three spiral spectra is demonstrated.•Relationship between the non-integer topological charge and the spiral spectra is presented.•Topological charge of non-integer vortices can be determined by three arbitrary spiral spectra.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2016.12.050