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Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/260

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Browsing Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu by Subject "ABCD Optical-System"

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    Citation Count: Eyyuboğlu, Halil T.,"Hermite-cosine-Gaussian laser beam and its propagation characteristics in turbulent atmosphere", Journal Of The Optical Society Of America A-Optics Image Science And Vision, Vol.22, No.8, pp.1527-1535, (2005).
    Hermite-cosine-Gaussian laser beam and its propagation characteristics in turbulent atmosphere
    (Optical Soc Amer, 2005) Eyyuboğlu, Halil T.; 7688
    Hermite-cosine-Gaussian (HcosG) laser beams are studied. The source plane intensity of the HcosG beam is introduced and its dependence on the source parameters is examined. By application of the Fresnel diffraction integral, the average receiver intensity of HcosG beam is formulated for the case of propagation in turbulent atmosphere. The average receiver intensity is seen to reduce appropriately to various special cases. When traveling in turbulence, the HcosG beam initially experiences the merging of neighboring beam lobes, and then a TEM-type cosh-Gaussian beam is formed, temporarily leading to a plain cosh-Gaussian beam. Eventually a pure Gaussian beam results. The numerical evaluation of the normalized beam size along the propagation axis at selected mode indices indicates that relative spreading of higher-order HcosG beam modes is less than that of the lower-order counterparts. Consequently, it is possible at some propagation distances to capture more power by using higher-mode-indexed HcosG beams.
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    Citation Count: Eyyuboğlu, H.T. (2007). Propagation of higher order Bessel-Gaussian beams in turbulence. Applied Physisc B-Lasers And Optics, 88(2), 259-265. http://dx.doi.org/10.1007/s00340-007-2707-6
    Propagation of higher order Bessel-Gaussian beams in turbulence
    (Springer, 2007) Eyyuboğlu, Halil T.; 7688
    The propagation characteristics of higher order Bessel-Gaussian beams travelling in turbulent atmosphere are investigated. Using extended Huygens-Fresnel principle, I formulated receiver plane intensity and solved it down to a double integral stage. Source beam plots are made illustrating the variation of intensity against order and width parameter. From the examination of receiver intensity graphs, it is seen that Bessel-Gaussian beam are converted into modified Bessel-Gaussian beams at intermediate propagation ranges eventually ending up as Gaussian profiles. The impacts of order and turbulence levels on beam profile are analysed. Focusing effects and beam size change along the propagation axis are studied