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Browsing Mühendislik Fakültesi by Author "Cai, Yangjian"

Now showing items 1-20 of 47

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. ...
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 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 ...
Beam Wander of J (0)- and I (0)-Bessel Gaussian Beams Propagating In Turbulent Atmosphere

Çil, Celal Zaim; Eyyuboğlu, Halil T.; Bykal, Yahya; Korotkova, Olga; Cai, Yangjian (Springer, 2010-01)

Root mean square (rms) beam wander of J (0)-Bessel Gaussian and I (0)-Bessel Gaussian beams, normalized by the rms beam wander of the fundamental Gaussian beam, is evaluated in atmospheric turbulence. Our formulation is ...
Beam wander of J (0)- and I (0)-Bessel Gaussian beams propagating in turbulent atmosphere

Çil, Celal Zaim; Eyyuboğlu, Halil T.; Baykal, Yahya; Korotkova, Olga; Cai, Yangjian (Springer, 2010-01)

Root mean square (rms) beam wander of J (0)-Bessel Gaussian and I (0)-Bessel Gaussian beams, normalized by the rms beam wander of the fundamental Gaussian beam, is evaluated in atmospheric turbulence. Our formulation is ...
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 ...
Correlation properties of random electromagnetic beams in laser resonators

Tong, Z.; Korotkova, Olga; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Springer, 2009-12)

With the help of the generalized Huygens-Fresnel principle and the tensor approach for electromagnetic stochastic beams we investigate the behavior of their two-point spatial correlation properties on interaction with a ...
Degree of polarization for partially coherent general beams in turbulent atmosphere

Eyyuboğlu, Halil T.; Baykal, Yahya; Cai, Yangjian (Springer, 2007-10)

The degree of polarization is found for optical excitations of cosh-Gaussian, cos-Gaussian and annular-Gaussian beams in a turbulent atmosphere. The related formulation is based on the beam coherence polarization matrix. ...
Diffraction properties of partially coherent elegant high-order beam

Wang, Fei; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Electromagnetics Acad, 2010)

The diffraction properties of a partially coherent elegant higher-order beam in free space are investigated in detail. It is found that the diffraction properties of a partially coherent elegant higher-order beam upon ...
Effect of beam types on the scintillations: A review

Baykal, Yahya; Eyyuboğlu, Halil T.; Cai, Yangjian (Spie-Int Soc Optical Engineering, 2009)

When different incidences are launched in atmospheric turbulence, it is known that the intensity fluctuations exhibit different characteristics. In this paper we review our work done in the evaluations of the scintillation ...
Effect of spatial coherence on the scintillation properties of a dark hollow beam in turbulent atmosphere

Yuan, Yangsheng; Chen, Yahong; Liang, Chunhao; Cai, Yangjian; Baykal, Yahya (Springer, 2013-03)

With the help of a tensor method, we derive an explicit expression for the on-axis scintillation index of a circular partially coherent dark hollow (DH) beam in weakly turbulent atmosphere. The derived formula can be applied ...
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 ...
Field correlations of annular beams in extremely strong turbulence

Baykal, Yahya; Cai, Yangjian; Ji, Xiaoling (Elsevier Science Bv, 2012-10-01)

The field correlations of annular beams are formulated when the atmosphere assumes extremely strong turbulence. Thicker and larger ring sized annular beams are found to exhibit larger absolute field correlations. For the ...
Formulation of scintillations for optical incidence of arbitrary field profile

Baykal, Yahya; Eyyuboğlu, Halil T.; Cai, Yangjian (Electromagnetics Acad, 2008)

Scintillation index on the receiver axis is formulated in random medium when an optical source with an arbitrary field profile is employed. To represent the arbitrary source field profile, source is decomposed into pixels ...
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 ...
Hypergeometric Gaussian beam and its propagation in turbulence

Eyyuboğlu, Halil T.; Cai, Yangjian (Elsevier Science Bv, 2012-10-01)

We study propagation characteristics of hypergeometric Gaussian beam in turbulence. In this context, we formulate the receiver plane intensity using extended Huygens-Fresnel integral. From the graphical results, it is seen ...
Incoherent sinusoidal-Gaussian and annular beam scintillations

Baykal, Yahya; Eyyuboğlu, Halil T.; Cai, Yangjian (Spie-Int Soc Optical Engineering, 2008)

The scintillation index is evaluated in horizontal turbulent atmospheric optical links for incidences of incoherent cosh-Gaussian (IChG), cos-Gaussian (ICG) and annular (IA) beams. Weak turbulence solution is obtained for ...
Intensity fluctuations in J-Bessel-Gaussian beams of all orders propagating in turbulent atmosphere

Eyyuboğlu, Halil T.; Sermutlu, Emre; Baykal, Yahya; Cai, Yangjian; Korotkova, Olga (Springer, 2008-11)

The scintillation index of a J (n) -Bessel-Gaussian beam of any order propagating in turbulent atmosphere is derived and numerically evaluated at transverse cross-sections with the aid of a specially designed triple integral ...

Now showing items 1-20 of 47

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Browsing Mühendislik Fakültesi by Author "Cai, Yangjian"

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