Browsing by Author "Oztan, Mehmet A."
Now showing 1 - 2 of 2
- Results Per Page
- Sort Options
Article Citation - WoS: 11Citation - Scopus: 11Effects of extremely strong turbulent medium on scintillations of partially coherent annular and flat-topped Gaussian beams(Elsevier Science Bv, 2012) Oztan, Mehmet A.; Baykal, Yahya; Nakiboglu, Cem; 7812Scintillation index of partially coherent annular and partially coherent flat-topped Gaussian beams propagating in horizontal links is found at the receiver origin when these beams propagate in extremely strong atmospheric turbulence. Scintillation index of coherent versions of such beams attain unity saturation value whereas the decrease in the degree of source coherence results in the decrease of the scintillations. At a fixed degree of partial coherence, thin ring sized annular beams possess smaller scintillations than thick ones. For partially coherent Flat-topped Gaussian beams, higher flatness yields smaller intensity fluctuations. In extremely strong turbulence, partially coherent annular and partially coherent flat-topped Gaussian beams have smaller scintillations when compared to partially coherent single Gaussian beam scintillations. (C) 2011 Elsevier B.V. All rights reserved.Article Citation - WoS: 7Citation - Scopus: 9Scintillations of partially coherent annular and flat-topped array beams in extremely strong turbulent medium(Elsevier Science Bv, 2015) Oztan, Mehmet A.; Baykal, Yahya; 7812Scintillation index of partially coherent multi-Gaussian array beams is analytically derived and numerically evaluated in extremely strong atmospheric turbulence. In the evaluations, partially coherent annular array and Bat-topped array beams are considered. When compared to the non-array partially coherent multi-Gaussian beam, it is shown that such array beams have smaller scintillations. The scintillation index is found to decrease with an increase in the number of beamlets. Laser at beams exhibit less scintillations when the beams become less coherent. Scintillations decrease when the radial distance of beamlets from the origin increases. At a fixed degree of partial coherence, thin ring sized annular array beams possess smaller scintillations than the thick ones. Flat-topped Gaussian array beams with higher flatness parameter. N have smaller scintillations in extremely strong turbulence. (C) 2015 Elsevier B.V. All rights reserved
