Scintillation of a laser beam propagation through non-Kolmogorov strong turbulence |
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| Authors: | Peng Deng Xiu-Hua Yuan Dexiu Huang |
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| Affiliation: | 1. Department of Physics, Huaihua University, Huaihua 418008, China;2. School of Physical Science and Technology, Soochow University, Suzhou 215006, China;3. School of Sciences, Zhejiang Agriculture and Forestry University, Lin’an 311300, China;1. Jiangnan University, Wuxi 214122, China;2. College of Internet of Things, Jiangnan University, Wuxi, Jiangsu 214000, China;3. College of Science, Jiangnan University, Wuxi, Jiangsu 214000, China;1. Department of Physics and Information Engineering, Huaihua University, Huaihua 418008, China;2. School of Sciences, Zhejiang Agriculture and Forestry University, Lin''an 311300, China;3. College of opto-electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China;1. Quality Test Center, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;2. Department of Ophthalmology, Affiliated Hospital of Changchun University of Traditional Chinese Medicine, Changchun 130021, China |
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| Abstract: | Atmospheric turbulence causes strong irradiance fluctuations of propagating optical wave under the severe weather conditions in long-distance free space optical communication. In this paper, the scintillation index for a Gaussian beam wave propagation through non-Kolmogorov turbulent atmosphere is derived in strong fluctuation regime, using non-Kolmogorov spectrum with a generalized power law exponent and the extended Rytov theory with a modified spatial filter function. The analytic expressions are obtained and then used to analyze the effect of power law, refractive-index structure parameter, propagation distance, phase radius of curvature, beam width and wavelength on scintillation index of Gaussian beam under the strong atmospheric turbulence. It shows that, with the increasing of structure parameter or propagation distance, scintillation index increases sharply up to the peak point and then decreases gradually toward unity at rates depending on power law. And there exist optimal value of radius of curvature and beam width for minimizing the value of scintillation index and long wavelength for mitigating the effect of non-Kolmogorov strong turbulence on link performance. |
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