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Incoherent sinusoidal-Gaussian and annular beam scintillations

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dc.contributor.author Baykal, Yahya
dc.contributor.author Eyyuboğlu, Halil T.
dc.contributor.author Cai, Yangjian
dc.date.accessioned 2020-04-07T07:51:40Z
dc.date.available 2020-04-07T07:51:40Z
dc.date.issued 2008
dc.identifier.citation Baykal, Yahya; Eyyuboğlu, Halil Tanyer; Cai, Yangjai, "Incoherent sinusoidal-Gaussian and annular beam scintillations", Fourteenth International Symposium On Atmospheric And Ocean Optics/Atmospheric Physics, Vol.6936, (20089. tr_TR
dc.identifier.isbn 978-0-8194-7123-9
dc.identifier.issn 0277-786X
dc.identifier.uri http://hdl.handle.net/20.500.12416/2949
dc.description.abstract The scintillation index is evaluated in horizontal turbulent atmospheric optical links for incidences of incoherent cosh-Gaussian (IChG), cos-Gaussian (ICG) and annular (IA) beams. Weak turbulence solution is obtained for a slow detector. Dependence of the intensity fluctuations of the IChG, ICG and IA beams on the link length, source size, wavelength and the structure constant are examined. At all the link lengths, fixed size IChG and ICG beams exhibit lower scintillations for larger absolute displacement parameters. At a fixed link length, IChG beam yields lower fluctuations than the ICG beam having the same absolute displacement parameter. For the same size primary beams, IA beam with narrower ring scintillates less than the IA beam with wider ring, and this holds to be valid for each link length. Investigation of the scintillation versus the source size reveals that increase in the source size lowers the scintillations for all types of the incoherent beams. At the same source size and the same absolute displacement parameter, IChG beams have lower fluctuations than the ICG beams, larger absolute displacement parameters exhibiting lower scintillations at the same source size for both beams. For IA beams, as the size of the primary beam is increased, the scintillations are reduced for all ring sizes, the reduction being pronounced for narrower rings. As the wavelength increases, the scintillations of IChG and ICG beams first increase, then at around the wavelength forming the Fresnel zone, the scintillations start to decrease and eventually for all types of IChG and ICG beams, the scintillation indices merge towards a certain value. Similar behaviour of the scintillations versus the wavelength is observed for IA beams as well. As long as the structure constant is kept within the range of interest to remain in the weak turbulence, raising the structure constant first increases the intensity fluctuations of beams for all the mentioned beam types where further rises in the structure constant result in the same level of scintillation index. Comparison of the scintillations of IChG, ICG and IA beams with their coherent counterparts and the coherent Gaussian beam shows that the IChG, ICG and IA beams are favorable for large sized sources. tr_TR
dc.language.iso eng tr_TR
dc.publisher Spie-Int Soc Optical Engineering tr_TR
dc.relation.isversionof 10.1117/12.783051 tr_TR
dc.rights info:eu-repo/semantics/closedAccess tr_TR
dc.subject Atmospheric Turbulence tr_TR
dc.subject Scintillations tr_TR
dc.subject Incoherence tr_TR
dc.subject Sinusoidal-Gaussian Beams tr_TR
dc.subject Annular Beams tr_TR
dc.title Incoherent sinusoidal-Gaussian and annular beam scintillations tr_TR
dc.type workingPaper tr_TR
dc.relation.journal Fourteenth International Symposium On Atmospheric And Ocean Optics/Atmospheric Physics tr_TR
dc.contributor.authorID 7812 tr_TR
dc.contributor.authorID 7688 tr_TR
dc.identifier.volume 6936 tr_TR
dc.contributor.department Çankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği Bölümü tr_TR


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