DSpace@Çankaya

Yayımcı "Optical Soc Amer" için Elektronik ve Haberleşme Mühendisliği Bölümü listeleme

Yayımcı "Optical Soc Amer" için Elektronik ve Haberleşme Mühendisliği Bölümü listeleme

Sırala: Sıra: Sonuçlar:

  • Active laser radar systems with stochastic electromagnetic beams in turbulent atmosphere 
    Cai, Yangjian; Korotkova, Olga; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2008-09-29)
    Propagation of stochastic electromagnetic beams through paraxial ABCD optical systems operating through turbulent atmosphere is investigated with the help of the ABCD matrices and the generalized Huygens-Fresnel integral. ...
  • Alternative interpretation of the edge-diffraction phenomenon 
    Umul, Yusuf Ziya (Optical Soc Amer, 2008-03)
    An alternative interpretation of the phenomenon of edge diffraction is proposed according to a new separation of the Fresnel function. The subfields are investigated in the problem of diffraction of a plane wave by a ...
  • Analysis of reciprocity of cos-Gaussian and cosh-Gaussian laser beams in a turbulent atmosphere 
    Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2004-10-04)
    In a turbulent atmosphere, starting with a cos-Gaussian excitation at the source plane, the average intensity profile at the receiver plane is formulated. This average intensity profile is evaluated against the variations ...
  • Annular beam scintillations in strong turbulence 
    Gerçekçioğlu, Hamza; Baykal, Yahya; Nakiboğlu, Cem (Optical Soc Amer, 2010-08)
    A scintillation index formulation for annular beams in strong turbulence is developed that is also valid in moderate and weak turbulence. In our derivation, a modified Rytov solution is employed to obtain the small-scale ...
  • Aperture averaging in multiple-input single-output free-space optical systems 
    Gökçe, Muhsin Caner; Baykal, Yahya; Uysal, Murat (Optical Soc Amer, 2016-06-01)
    Multiple-input single-output (MISO) techniques are employed in free-space optical (FSO) links to mitigate the degrading effects of atmospheric turbulence. In this paper, for the MISO FSO system, a partially coherent radial ...
  • Apertured paraxial Bessel beams 
    Umul, Yusuf Ziya (Optical Soc Amer, 2010-03)
    The paraxial Bessel beam is obtained by applying an approximation in the wavenumbers. The scattering of the beams by a circular aperture in an absorbing screen is investigated. The scattered fields are expressed in terms ...
  • Average intensity and spreading of an elegant Hermite-Gaussian beam in turbulent atmosphere 
    Yuan, Yangsheng; Cai, Yangjian; Qu, Jun; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2009-06-22)
    The propagation of an elegant Hermite-Gaussian beam (EHGB) in turbulent atmosphere is investigated. Analytical propagation formulae for the average intensity and effective beam size of an EHGB in turbulent atmosphere are ...
  • Average intensity and spreading of cosh-Gaussian laser beams in the turbulent atmosphere 
    Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2005-02-20)
    The average intensity and spreading of cosh-Gaussian laser beams in the turbulent atmosphere are examined. Our research is based principally on formulating the average-intensity profile at the receiver plane for cosh-Gaussian ...
  • Beam diffraction by a resistive half-plane 
    Umul, Yusuf Ziya (Optical Soc Amer, 2015-04-01)
    The scattering of a Gaussian beam by a resistive half-screen is investigated. Far-field approximation is used in evaluation of geometrical optics and diffracted waves. The uniform expression of the diffracted waves by the ...
  • Bit error rate analysis of Gaussian, annular Gaussian, cos Gaussian, and cosh Gaussian beams with the help of random phase screens 
    Eyyuboğlu, Halil T. (Optical Soc Amer, 2014-06-10)
    Using the random phase screen approach, we carry out a simulation analysis of the probability of error performance of Gaussian, annular Gaussian, cos Gaussian, and cosh Gaussian beams. In our scenario, these beams are ...
  • Bit error rates for general beams 
    Altay Arpalı, Serap; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2008-11-10)
    In order to analyze the effect of beam type on free space optical communication systems, bit error rate (BER) values versus signal-to-noise ratio (SNR) are calculated for zero order and higher order general beam types, ...
  • Complex degree of coherence for partially coherent general beams in atmospheric turbulence 
    Eyyuboğlu, Halil T.; Baykal, Yahya; Cai, Yangjian (Optical Soc Amer, 2007-09)
    With the use of the general beam formulation, the modulus of the complex degree of coherence for partially coherent cosh-Gaussian, cos-Gaussian, Gaussian, annular and higher-order Gaussian optical beams is evaluated in ...
  • Cross beam scintillations in non-Kolmogorov medium 
    Baykal, Yahya (Optical Soc Amer, 2014-10)
    For the collimated and focused cross beams, the on-axis scintillation index is evaluated when these beams propagate in weak non-Kolmogorov turbulence. In the limiting cases, our solution correctly reduces to the known ...
  • Diffraction by a black half plane: Modified theory of physical optics approach 
    Umul, Yusuf Ziya (Optical Soc Amer, 2005-09-19)
    The scattered fields from a black half plane which absorbs all the incoming electromagnetic energy are evaluated by defining a new modified theory of physical optics surface current. This current eliminates the reflected ...
  • Diffraction of evanescent plane waves by a resistive half-plane 
    Umul, Yusuf Ziya (Optical Soc Amer, 2007-10)
    Diffraction of evanescent plane waves by a resistive half-plane is examined. The scattering integrals are constructed with the modified theory of physical optics. These integrals are evaluated uniformly by using an unusual ...
  • Diffraction of homogeneous and inhomogeneous plane waves by a planar junction between perfectly conducting and impedance half-planes 
    Umul, Yusuf Ziya (Optical Soc Amer, 2007-01)
    The problem of diffraction of homogeneous and inhomogeneous plane waves at the discontinuity formed by perfectly conducting and impedance half-planes is examined by the method of modified theory of physical optics (MTPO). ...
  • Diffraction of waves by a boundary between two half-planes with different resistivities 
    Umul, Yusuf Ziya (Optical Soc Amer, 2015-04-01)
    The solution of the diffraction problem of waves by a junction between two resistive half-screens is obtained by using the wedge diffraction field expression, introduced by Maliuzhinets [Ann. Phys. 461, 107 (1960)]. The ...
  • Edge-dislocation waves in the diffraction process by an impedance half-plane 
    Umul, Yusuf Ziya (Optical Soc Amer, 2007-02)
    Edge-dislocation waves, created in the diffraction of plane waves by an impedance half-plane, are examined by the method of modified theory of physical optics. The integrals, obtained by a related technique, are decomposed ...
  • Effect of the shadow geometry in wedge diffraction 
    Umul, Yusuf Ziya (Optical Soc Amer, 2009-09-01)
    The surface integrals of the modified theory of physical optics are divided into two parts for diffraction by a wedge. Each integral represents the incident or reflected field scattered by one of the faces of the wedge. ...
  • Effect of the shadow geometry on diffraction 
    Umul, Yusuf Ziya (Optical Soc Amer, 2008-12)
    The effect of the scatterer surface on the shadow region is examined by using the surface integrals of the modified theory of physical optics. It is shown that the shadow geometry has a considerable effect on the structure ...