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yousefi M, golmohammady nezhadi S, dabbagh kashani F, ghafary B. Analyzing propagation behavior of partially coherent elliptical Flat-Topped laser beam coherency through oceanic turbulence. ICOP & ICPET _ INPC _ ICOFS 2015; 21 :209-212
URL: http://opsi.ir/article-1-555-en.html
URL: http://opsi.ir/article-1-555-en.html
1- iran university of science and technology
Abstract: (4236 Views)
In this paper, the propagation of Elliptical Partially Coherent Flat-Topped (EPCFT) laser beam in an oceanic turbulence is investigated based on the extended Huygens-Fresnel integral principle and the unified theory of coherence and polarization. For achieving this aim, analytical expression for the cross spectral density matrix is derived, then analytical formula for studying the spectral degree of coherence, effective width of coherence is reported. The effects of some important source factors (such as wavelength,λ ) and environmental factors (the relative strength of temperature and salinity fluctuations ω , the rate of dissipation of turbulent kinetic energy per unit mass of fluid, ε ) on statistical quantities listed above have been studied. Based on these analytical expressions, conclusions demonstrate that spectral degree of coherence and effective width of coherence for small amount of ε (which is corresponded to strong turbulence) and for the condition which salinity fluctuations in the ocean dominate temperature fluctuations (greater amount of ω) decrease rapidly. Effective width of coherence for shorter wavelengths decreases rapidly in comparison with long wavelengths. The achieving conclusion indicated by graphs.
Keywords: propagation of elliptical flat-topped laser beam, ocean turbulent, coherence, underwater laser communication
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