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Mühendislik Fakültesi

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    Article
    Citation Count: Eyyuboğlu, Halil Tanyer; Cil, C.Z.,"Beam wander of dark hollow, flat-topped and annular beams", Applied Physics B-Lasers And Optics, Vol.93, No.2-3, pp.595-604, (2008).
    Beam wander of dark hollow, flat-topped and annular beams
    (Springer Heidelberg, 2008) Eyyuboğlu, Halil T.; Çil, Celal Zaim; 7688
    Benefiting from the earlier derivations for the Gaussian beam, we formulate beam wander for dark hollow (DH) and flat-topped (FT) beams, also covering the annular Gaussian (AG) beam as a special case. Via graphical illustrations, beam wander variations of these beams are analyzed and compared among themselves and to the fundamental Gaussian beam against changes in propagation length, amplitude factor, source size, wavelength of operation, inner and outer scales of turbulence. These comparisons show that in relation to the fundamental Gaussian beam, DH and FT beams will exhibit less beam wander, particularly at small primary beam source sizes, lower amplitude factors of the secondary beam and higher beam orders. Furthermore, DH and FT beams will continue to preserve this advantageous position all throughout the considered range of wavelengths, inner and outer scales of turbulence. FT beams, in particular, are observed to have the smallest beam wander values among all, up to certain source sizes.
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    Article
    Citation Count: Umul, Y.Z. (2008). Fringe waves radiated by a half-plane for the boundary conditions of Neumann. Applied Physisc B-Lasers And Optics, 93(4), 885-889. http://dx.doi.org/10.1007/s00340-008-3240-y
    Fringe waves radiated by a half-plane for the boundary conditions of Neumann
    (Springer, 2008) Umul, Yusuf Ziya; 42699
    The fringe waves of the physical theory of diffraction are obtained in terms of Fresnel integrals for a half-plane satisfying the Neumann boundary condition. The approximate expressions of the radiated waves are also evaluated for sufficiently large wavenumbers. The fields are plotted and compared numerically