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Browsing by Publisher "Spie-Int Soc Optical Engineering"

Now showing items 1-18 of 18

Automatic detection of mitochondria from electron microscope tomography images: a curve fitting approach

Taşel, Faris Serdar; Hassanpour, Reza; Mumcuoğlu, E. U.; Perkins, Guy; Martone, Maryann (Spie-Int Soc Optical Engineering, 2014)

Mitochondria are sub-cellular components which are mainly responsible for synthesis of adenosine tri-phosphate (ATP) and involved in the regulation of several cellular activities such as apoptosis. The relation between ...
Average received intensity for optical beam of arbitrary field profile after propagation in turbulent atmosphere

Arpalı, Çağlar; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2009)

Employing our previously obtained formulation of the average received intensity for arbitrary optical beam in turbulent atmosphere, intensity patterns of already known and new source profiles are obtained. Arbitrary beam ...
Beam Wander Characteristics of Flat-Topped, Dark Hollow, Cos and Cosh-Gaussian, J(0)- And I-0- Bessel Gaussian Beams Propagating In Turbulent Atmosphere: A Review

Eyyuboğlu, Halil T.; Baykal, Yahya; Çil, Celal Z.; Korotkova, Olga; Cai,Yangjian (Spie-Int Soc Optical Engineering, 2010)

In this paper we review our work done in the evaluations of the root mean square (rms) beam wander characteristics of the flat-topped, dark hollow, cos-and cosh Gaussian, J(0)-Bessel Gaussian and the I-0-Bessel Gaussian ...
Beams with arbitrary field profiles in turbulence - art. no. 652209

Baykal, Yahya (Spie-Int Soc Optical Engineering, 2006)

Characteristics of optical beam incidences that have arbitrary field profiles are examined when they propagate in the turbulent atmosphere. Arbitrary source field profile is introduced by decomposing the source into ...
Cosine-Gaussian laser beam intensity in turbulent atmosphere

Eyyuboğlu, Halil T.; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2004)

The effects of turbulent atmosphere on cosine-Gaussian laser beams are examined. To this end, a cosine-Gaussian excitation is taken at the source plane, and subsequently the average intensity profile at the receiver plane ...
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 source spatial partial coherence on the angle-of-arrival fluctuations for free-space optics links

Baykal, Yahya; Eyyuboğlu, Halil T. (Spie-Int Soc Optical Engineering, 2006-05)

The dependence of angle-of-arrival fluctuations on source coherence for free-space optics links in a turbulent atmosphere is examined. A monochromatic beam is taken, and the variation of the angle-of-arrival fluctuations ...
Effects of laser multimode content on the angle-of-arrival fluctuations in free space optics access systems

Eyyuboğlu, Halil T.; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2004)

The effects of the multimode content in a laser beam on the angle-of-arrival fluctuations are examined for free space optics (FSO) access systems. Multimode excitation is represented by coherent addition of Hermite-Gaussian ...
Higher order annular Gaussian laser beam propagation in free space (vol 45, art no 038002, 2006)

Eyyuboğlu, Halil T.; Yenice, Y. E.; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2006-03)

Propagation of higher order annular Gaussian (HOAG) laser beams in free space is examined. HOAG beams are defined as the difference of two Hermite-Gaussian (HG) beams; thus, they can be produced by subtracting a smaller ...
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 for source arrays in turbulent atmosphere - art. no. 630308

Baykal, Yahya (Spie-Int Soc Optical Engineering, 2006)

Intensity fluctuations are formulated for source arrays in weakly turbulent horizontal atmospheric links. Source array is composed of point sources separated by variable distances in the transverse source directions. Formula ...
Intensity fluctuations of focused general-type beams in atmospheric optics links

Baykal, Yahya; Eyyuboğlu, Halil T. (Spie-Int Soc Optical Engineering, 2007)

The intensity fluctuations of focused general-type beams in weakly turbulent atmospheric links are formulated and numerically evaluated. Focused general-type beams in general cover very large range of beams, however in ...
Intensity Fluctuations of Incoherently Superposed Gaussian Beams In Atmospheric Turbulence

Baykal, Yahya (Spie-Int Soc Optical Engineering, 2010)

Intensity fluctuations of incoherently superposed Gaussian beams are formulated in weak turbulence by employing the extended Huygens-Fresnel principle. Each individual beam superposed is taken to be fully incoherent. The ...
Method of Evaluation of the Mutual Coherence Function of Laser Beams and Its Application for Symmetric Dark Hollow Beams

Banakh, V. A.; Marakasov, D. A.; Rytchkov, D. S.; Baykal, Yahya; Eyyuboğlu, Halil T. (Spie-Int Soc Optical Engineering, 2011)

In our report, a method of evaluation of the mutual coherence function (MCF) of optical wave propagating in turbulent atmosphere is proposed. The method is based on using inverse Fresnel transform and 2-D Fast Fourier ...
Performance analysis of mimo fso systems with radial arraybeams and finite sized detectors

Gökçe, Muhsin Caner; Kamacıoğlu, Canan; Uysal, Murat; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2014)

Multiple-input multiple-output (MIMO) systems are employed in free space optical (FSO) links to mitigate the degrading effects of atmospheric turbulence. In this paper, we consider a MIMO FSO system with practical transmitter ...
Propagation of cross beams through atmospheric turbulence

Yenice, Y. E.; Eyyuboğlu, Halil T.; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2005)

Propagation properties of cross beam in turbulent medium are studied. A cross beam is constructed by the sum of two highly asymmetric Gaussian beams placed along transverse axes. It is known that such beams, when propagating ...
Propagation of Elegant Higher-Order Gaussian Beams In Turbulent Atmosphere

Wang, Fei; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2010)

Propagation of elegant higher-order Gaussian beams in turbulent atmosphere is studied in detail. Analytical propagation formulae of elegant higher-order Gaussian beams in turbulent atmosphere are derived based on extended ...
Rate averaging in free space optics systems using incoherent sources

Baykal, Yahya (Spie-Int Soc Optical Engineering, 2004-06-23)

Effect of the information rate on the scintillation index is examined for free space optical (FSO) broadband access applications that use spatially incoherent sources. For this purpose, intensity fluctuations are formulated ...

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