Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu: Recent submissions

  • Modified diffraction theory of Kirchhoff 
    Umul, Yusuf Ziya (Optical Soc Amer, 2008-08)
    The diffraction theory of Kirchhoff is reinterpreted and a new form of a surface diffraction integral is developed by using the axioms of the modified theory of physical optics, which leads to the exact scattered fields ...
  • Propagation properties of anomalous hollow beams in a turbulent atmosphere 
    Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Elsevier Science, 2008-11-01)
    Propagation of circular and elliptical anomalous hollow beams in a turbulent atmosphere is investigated in detail. Based on the extended Huygens-Fresnel integral, analytical formulae for the average irradiance of circular ...
  • 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. ...
  • Evolution of the degree of polarization of an electromagnetic Gaussian Schell-model. beam in a Gaussian cavity 
    Yao, Min; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya; Korotkova, Olga (Optical Soc Amer, 2008-10-01)
    The interaction of an electromagnetic Gaussian Schell-model (EGSM) beam with a Gaussian cavity is analyzed. In particular, the evolution of the degree of polarization of the EGSM beam is investigated. The results show that ...
  • Young-Kirchhoff-Rubinowicz theory of diffraction in the light of Sommerfeld's solution 
    Umul, Yusuf Ziya (Optical Soc Amer, 2008-11)
    Kirchhoff's theory of diffraction is derived by transforming the exact solution of Sommerfeld into surface integrals for the half-plane problem. It is shown that the exact solution directly yields the integral theorem of ...
  • State of polarization of a stochastic electromagnetic beam in an optical resonator 
    Korotkova, Olga; Yao, Min; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2008-11)
    On the basis of the unified theory of coherence and polarization, we investigate the behavior of the state of polarization of a stochastic electromagnetic beam in a Gaussian cavity. Formulations both in terms of Stokes ...
  • Spectral shifts of general beams in turbulent media 
    Eyyuboğlu, Halil T.; Cai, Yangjian; Baykal, Yahya (IOP Publishing Ltd, 2008-01)
    Using the concept of generalized beam, by applying the extended Huygens-Fresnel principle, we derive the spectrum for partially coherent cosh-Gaussian, cos-Gaussian, Gaussian and annular Gaussian beams propagating in ...
  • Paraxial propagation of a partially coherent flattened Gaussian beam through apertured ABCD optical systems 
    Cai, Yangjian; Xiang, Lü; Eyyuboğlu, Halil T.; Baykal, Yahya (Elsevier Science, 2008-06-15)
    By expanding the hard aperture function into a finite sum of complex Gaussian functions, some approximate analytical formulae for the cross-spectral density of a partially coherent flattened Gaussian beam (FGB) propagating ...
  • Propagation aspects of Mathieu-Gaussian beams in turbulence 
    Eyyuboğlu, Halil T. (Springer, 2008-06)
    Based on our recent source plane formulation, the propagation characteristics of Mathieu-Gaussian beams in turbulent atmosphere are investigated. In this connection, the average receiver plane intensity expression is deduced ...
  • Scintillation of astigmatic dark hollow beams in weak atmospheric turbulence 
    Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2008-07)
    The scintillation properties of astigmatic dark hollow beams (DHBs) in weak atmospheric turbulence were investigated in detail. An explicit expression for the on-axis scintillation index of an astigmatic DH13 propagating ...
  • A study of source plane Mathieu beams 
    Eyyuboğlu, Halil T. (Springer, 2008-06)
    We derive the source field expressions of different Mathieu beams. In particular, Mathieu beams consisting of the infinite summations of J-type Bessel functions and their Gaussian counterparts are studied. Mathieu beams ...
  • Average irradiance and polarization properties of a radially or azimuthally polarized beam in a turbulent atmosphere 
    Cai, Yangjian; Qiang, Lin; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Society of America, 2008-05-26)
    Analytical formulas are derived for the average irradiance and the degree of polarization of a radially or azimuthally polarized doughnut beam (PDB) propagating in a turbulent atmosphere by adopting a beam coherence-polarization ...
  • Minimization of scintillation index against displacement parameters 
    Eyyuboğlu, Halil T.; Gerçekçioğlu, Hamza; Baykal, Yahya (Elsevier Science, 2008-09-01)
    For sinusoidal beams, minimization of scintillation index is carried out against the displacements parameters. It is found-that x-y asymmetric cosh-Gaussian beam fulfills the requirements of such optimum beam. Our minimization ...
  • 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, ...
  • Scintillation advantages of lowest order Bessel-Gaussian beams 
    Eyyuboğlu, Halil T.; Baykal, Yahya; Sermutlu, Emre (Springer, 2008-08)
    For a weak turbulence propagation environment, the scintillation index of the lowest order Bessel-Gaussian beams is formulated. Its triple and single integral versions are presented. Numerical evaluations show that at large ...
  • Propagation and coherence properties of higher order partially coherent dark hollow beams in turbulence 
    Eyyuboğlu, Halil T. (Elsevier Science Ltd, 2008-02)
    We formulate and evaluate in terms of graphical outputs, source and receiver plane expressions, the complex degree of coherence, beam size variation and power in bucket performance for higher order partially coherent dark ...
  • Propagation of laser array beams in a turbulent atmosphere 
    Cai, Y.; Chen, Y.; Eyyuboğlu, Halil T.; Baykal, Yahya (Springer, 2007-08-01)
    The propagation of phase-locked and non-phase-locked laser array beams of radial and rectangular symmetries in a turbulent atmosphere are investigated based on the extended Huygens-Fresnel integral. The beamlet used in our ...
  • Propagation of higher order Bessel-Gaussian beams in turbulence 
    Eyyuboğlu, Halil T. (Springer, 2007-07)
    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 ...
  • Uniform theory for the diffraction of evanescent plane waves: publisher's note 
    Umul, Yusuf Ziya (Optical Soc Amer, 2007-09)
    A uniform diffracted field is obtained in terms of Fresnel functions with complex argument by subtracting the unit step function from the Fresnel integral. The method is applied to the problem of diffraction of inhomogeneous ...
  • Structure functions in turbulence for incidence with arbitrary-field distribution 
    Baykal, Yahya (Optical Soc Amer, 2007-06)
    In a turbulent atmosphere, the log-amplitude, phase-correlation, and structure functions are formulated for light sources exhibiting arbitrary-field distribution. This is done by extending the formulations of the correlation ...