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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 Institution Author "Eyyuboglu, HT"

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    Article
    Citation - WoS: 83
    Citation - Scopus: 86
    Hermite-Cosine Laser Beam and Its Propagation Characteristics in Turbulent Atmosphere
    (Optical Soc Amer, 2005) Eyyuboglu, HT
    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. (C) 2005 Optical Society of America.
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    Conference Object
    Citation - WoS: 1
    Propagation of a Generalized Beam in Abcd System
    (Cemal Ardil-IEC Barbaros Mah Hasret Sitesi, 2005) Eyyuboglu, HT; Elektronik ve Haberleşme Mühendisliği
    For a generalized Hermite sinosiodal/hyperbolic Gaussian beam passing through an ABCD system with a finite aperture, the propagation properties are derived using the Collins integral. The results are obtained in the form of intensity graphs indicating that previously demonstrated rules of reciprocity are applicable, while the existence of the aperture accelerates this transformation.
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    Article
    Citation - WoS: 81
    Citation - Scopus: 86
    Propagation of Hermite-Cosh Laser Beams in Turbulent Atmosphere
    (Elsevier, 2005) Eyyuboglu, HT
    The propagation characteristics of Hermite-cosh-Gaussian (HCG) beams in turbulence are studied. To this end, from a HCG source plane excitation, the average intensity of the receiver plane is developed analytically. This formulation is verified against the existing solution of HCG beams in free space. The results indicate that upon traveling in turbulent atmosphere, the HCG beam will undergo three stages of evolution. Initially, it will preserve the original profile. Then, with source parameters of right choice, this beam will turn into a sine shape if the sum of mode indices is odd, and into a cos shape if the sum of mode indices is even. Eventually however, HCG originated beam will become a pure Gassian beam. The dependence of these stages on source and propagation conditions is investigated. (C) 2004 Elsevier B.V. All rights reserved.