Inner scale effect on scintillation index of flat-topped beam in non-Kolmogorov weak turbulence

A simpler generalized expression of irradiance fluctuation for flat-topped beams is presented based on the Born and Rytov perturbation methods. The theoretical expression of the on-axis scintillation index in non-Kolmogorov weak atmospheric optics links is developed using the generalized von Kármán...

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Bibliographic Details
Published inApplied optics. Optical technology and biomedical optics Vol. 54; no. 10; p. 2630
Main Authors Zeng, Zhihong, Luo, Xiujuan, Xia, Aili, Zhang, Yu, Cao, Bei
Format Journal Article
LanguageEnglish
Published United States 01.04.2015
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Summary:A simpler generalized expression of irradiance fluctuation for flat-topped beams is presented based on the Born and Rytov perturbation methods. The theoretical expression of the on-axis scintillation index in non-Kolmogorov weak atmospheric optics links is developed using the generalized von Kármán spectrum model, and using the equivalent structure constant that is different for all power-law exponents. The effect of the inner scale on the on-axis scintillation index is examined comprehensively. It is observed that flat-topped beams happen to possess smaller scintillation indices at larger inner scale. The effects of the power law, flat-topped order, source size of the fundamental Gaussian beam, propagation distance, and wavelength are also analyzed.
ISSN:2155-3165
DOI:10.1364/AO.54.002630