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Phase detection of coherence singularities and determination of the topological charge of a partially coherent vortex beam
Soochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China..
Soochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China..
Delft Univ Technol, Opt Res Grp, NL-2628 CH Delft, Netherlands..
Soochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China..
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2019 (Engelska)Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 114, nr 20, artikel-id 201106Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In the theory of partial coherence, coherence singularities can occur in the spectral degree of coherence (SDOC): in case the fields at two different points are completely uncorrelated, the phase of the SDOC is undefined. For a partially coherent vortex beam, the detection of coherence singularities is linked to the measurement of topological charge, whose magnitude equals the number of ring dislocations in its far field amplitude. However, the phase distribution of coherence singularities is rarely mentioned in the literature and the amplitude distribution can hardly reflect the sign of topological charge. In this letter, we present a phase-analysis method for measuring the coherence singularities by introducing a movable perturbation at a certain point in an illumination window of a finite size. Using the proposed method, we measure experimentally the coherence singularities of a partially coherent vortex beam in the focal plane. From the results, the magnitude and sign of the topological charge can be determined simultaneously from the phase distribution of the coherence singularities. Our results can find application in information transmission.

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American Institute of Physics (AIP), 2019. Vol. 114, nr 20, artikel-id 201106
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URN: urn:nbn:se:kth:diva-254102DOI: 10.1063/1.5095713ISI: 000470153700016Scopus ID: 2-s2.0-85066030494OAI: oai:DiVA.org:kth-254102DiVA, id: diva2:1329329
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QC 20190624

Tillgänglig från: 2019-06-24 Skapad: 2019-06-24 Senast uppdaterad: 2019-06-24Bibliografiskt granskad

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