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Annular beam scintillations in strong turbulence

dc.contributor.authorGerçekçioğlu, Hamza
dc.contributor.authorBaykal, Yahya
dc.contributor.authorNakiboğlu, Cem
dc.contributor.authorID7812tr_TR
dc.date.accessioned2016-06-13T09:06:07Z
dc.date.available2016-06-13T09:06:07Z
dc.date.issued2010
dc.departmentÇankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliğien_US
dc.description.abstractA scintillation index formulation for annular beams in strong turbulence is developed that is also valid in moderate and weak turbulence. In our derivation, a modified Rytov solution is employed to obtain the small-scale and large-scale scintillation indices of annular beams by utilizing the amplitude spatial filtering of the atmospheric spectrum. Our solution yields only the on-axis scintillation index for the annular beam and correctly reduces to the existing strong turbulence results for the Gaussian beam-thus plane and spherical wave scintillation indices-and also correctly yields the existing weak turbulence annular beam scintillations. Compared to collimated Gaussian beam, plane, and spherical wave scintillations, collimated annular beams seem to be advantageous in the weak regime but lose this advantage in strongly turbulent atmosphere. It is observed that the contribution of annular beam scintillations comes mainly from the small-scale effects. At a fixed primary beam size, the scintillations of thinner collimated annular beams compared to thicker collimated annular beams are smaller in moderate turbulence but larger in strong turbulence; however, thinner annular beams of finite focal length have a smaller scintillation index than the thicker annular beams in strong turbulence. Decrease in the focal length decreases the annular beam scintillations in strong turbulence. Examining constant area annular beams, smaller primary sized annular structures have larger scintillations in moderate but smaller scintillations in strong turbulence. (C) 2010 Optical Society of Americaen_US
dc.description.publishedMonth8
dc.identifier.citationGerçekçioğlu, H., Baykal, Y., Nakiboğlu, C. (2010). Annular beam scintillations in strong turbulence. Journal of the Optical Society of America A-Optics Image Science and Vision, 27(8), 1834-1839.en_US
dc.identifier.endpage1839en_US
dc.identifier.issn1084-7529
dc.identifier.issue8en_US
dc.identifier.startpage1834en_US
dc.identifier.urihttp://hdl.handle.net/20.500.12416/1083
dc.identifier.volume27en_US
dc.language.isoenen_US
dc.publisherOptical Soc Ameren_US
dc.relation.ispartofJournal of the Optical Society of America A-Optics Image Science and Visionen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectFluctuationsen_US
dc.titleAnnular beam scintillations in strong turbulencetr_TR
dc.titleAnnular Beam Scintillations in Strong Turbulenceen_US
dc.typeArticleen_US
dspace.entity.typePublication

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