Phase detection of coherence singularities and determination of the topological charge of a partially coherent vortex beam

Lu, XingyuanSoochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China. (författare)

QC 20190624
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.

Zhao, ChengliangSoochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China. (författare)
Shao, YifengDelft Univ Technol, Opt Res Grp, NL-2628 CH Delft, Netherlands. (författare)
Zeng, JunSoochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China. (författare)
Konijnenberg, SanderDelft Univ Technol, Opt Res Grp, NL-2628 CH Delft, Netherlands. (författare)
Zhu, XinleiSoochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China. (författare)
Popov, SergeiKTH,Fotonik(Swepub:kth)u1fs8je2 (författare)
Urbach, H. PaulDelft Univ Technol, Opt Res Grp, NL-2628 CH Delft, Netherlands. (författare)
Cai, YangjianSoochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China.;Shandong Normal Univ, Sch Phys & Elect, Shandong Prov Engn & Tech Ctr Light Manipulat, Jinan 250014, Shandong, Peoples R China.;Shandong Normal Univ, Sch Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250014, Shandong, Peoples R China. (författare)
Soochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China.Delft Univ Technol, Opt Res Grp, NL-2628 CH Delft, Netherlands. (creator_code:org_t)

Ingår i:Applied Physics Letters: American Institute of Physics (AIP)114:200003-69511077-3118

Av författaren/redakt...: Lu, Xingyuan; Zhao, Chengliang; Shao, Yifeng; Zeng, Jun; Konijnenberg, Sa ...; Zhu, Xinlei; visa fler...; Popov, Sergei; Urbach, H. Paul; Cai, Yangjian; visa färre...

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