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Browsing Elektronik ve Haberleşme Mühendisliği Bölümü by Subject "Laser-Beams"

Now showing items 1-14 of 14

Average intensity and spreading of partially coherent standard and elegant Laguerre-Gaussian beams in turbulent atmosphere

Wang, F.; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (E M W Publishing, 2010)

Analytical expressions for the average intensity, mean-squared beam width and angular spread of partially coherent standard and elegant Laguerre-Gaussian (LG) beams propagating in turbulent atmosphere are derived. The ...
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 ...
Beam wander characteristics of cos and cosh-Gaussian beams

Çil, Celal Zaim; Eyyuboğlu, Halil T.; Baykal, Yahya; Cai, Yangjian (Springer, 2009-06)

Within the context of a general beam formulation, beam wander characteristics of cos and cosh-Gaussian beams are derived and numerically evaluated. In our graphs, the fundamental Gaussian beam is used as a benchmark for ...
Calculation of average intensity via semi-analytic method

Eyyuboğlu, Halil T.; Sermutlu, Emre (Springer, 2010-03)

We present a semi-analytic approach to the solution of the quadruple Huygens-Fresnel integral which is used to calculate the average receiver intensity of a source beam after it has propagated in a turbulent atmosphere. ...
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 ...
Generalized tensor ABCD law for an elliptical Gaussian beam passing through an astigmatic optical system in turbulent atmosphere

Cai, Yangjian; Lin, Q.; Eyyuboğlu, Halil T.; Baykal, Yahya (Springer, 2009-02)

The propagation of an elliptical Gaussian beam (EGB) through an astigmatic ABCD optical system in a turbulent atmosphere is investigated. An analytical formula for the average intensity of an EGB and a generalized tensor ...
Off-axis Field Correlations in Turbulence

Baykal, Yahya (IEEE, 2013)

The field correlations in atmospheric turbulence are evaluated for off-axis optical incidence. Within the practical range of the source and the medium parameters, increase in the diagonal length at the receiver plane is ...
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 ...
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 ...
Scintillation characteristics of cosh-Gaussian beams

Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2007-03-01)

By using the generalized beam formulation, the scintillation index is derived and evaluated for cosh-Gaussian beams in a turbulent atmosphere. Comparisons are made to cos-Gaussian and Gaussian beam scintillations. The ...
Scintillation index of flat-topped Gaussian beams

Baykal, Yahya; Eyyuboğlu, Halil T. (Optical Soc Amer, 2006-01-01)

The scintillation index is formulated for a flat-topped Gaussian beam source in atmospheric turbulence. The variations of the on-axis scintillations at the receiver plane are evaluated versus the link length, the size of ...
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 ...
Scintillations of multiwavelength Gaussian, cos, cosh and annular Gaussian beams

Eyyuboğlu, Halil T. (Springer, 2012-01)

We provide the scintillation formulation for a multiwavelength source. Within this context, the scintillation aspects of Gaussian, cos, cosh and annular Gaussian beams are investigated. For all situations examined, it is ...
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 ...

Now showing items 1-14 of 14

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Browsing Elektronik ve Haberleşme Mühendisliği Bölümü by Subject "Laser-Beams"

Browsing Elektronik ve Haberleşme Mühendisliği Bölümü by Subject "Laser-Beams"

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