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• W1999146875 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 andthe structure constant are examined. At all the link lengths, fixed size IChG and ICG beams exhibit lower scintillationsfor larger absolute displacement parameters. At a fixed link length, IChG beam yields lower fluctuations than the ICGbeam having the same absolute displacement parameter. For the same size primary beams, IA beam with narrower ringscintillates less than the IA beam with wider ring, and this holds to be valid for each link length. Investigation of thescintillation versus the source size reveals that increase in the source size lowers the scintillations for all types of theincoherent beams. At the same source size and the same absolute displacement parameter, IChG beams have lowerfluctuations than the ICG beams, larger absolute displacement parameters exhibiting lower scintillations at the samesource size for both beams. For IA beams, as the size of the primary beam is increased, the scintillations are reduced forall ring sizes, the reduction being pronounced for narrower rings. As the wavelength increases, the scintillations of IChGand ICG beams first increase, then at around the wavelength forming the Fresnel zone, the scintillations start to decreaseand eventually for all types of IChG and ICG beams, the scintillation indices merge towards a certain value. Similarbehaviour of the scintillations versus the wavelength is observed for IA beams as well. As long as the structure constantis kept within the range of interest to remain in the weak turbulence, raising the structure constant first increases theintensity fluctuations of beams for all the mentioned beam types where further rises in the structure constant result in thesame level of scintillation index. Comparison of the scintillations of IChG, ICG and IA beams with their coherentcounterparts and the coherent Gaussian beam shows that the IChG, ICG and IA beams are favorable for large sizedsources." @default.
• W1999146875 created "2016-06-24" @default.
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• W1999146875 date "2007-12-21" @default.
• W1999146875 modified "2023-09-23" @default.
• W1999146875 title "<title>Incoherent sinusoidal-Gaussian and annular beam scintillations</title>" @default.
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• W1999146875 doi "https://doi.org/10.1117/12.783051" @default.
• W1999146875 hasPublicationYear "2007" @default.
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