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Browsing by Author "Chen, Y."

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    Article
    Citation Count: Cai, Y...et al. (2007). Propagation of laser array beams in a turbulent atmosphere. Applied Physisc B-Lasers And Optics, 88(3), 467-475. http://dx.doi.org/10.1007/s00340-007-2680-0
    Propagation of laser array beams in a turbulent atmosphere
    (Springer, 2007) Cai, Y.; Chen, Y.; Eyyuboğlu, Halil T.; Baykal, Yahya; 7688; 7812
    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 paper for constructing the laser array beams is of elliptical Gaussian mode. Analytical formulae for the average irradiance of phase-locked and non-phase-locked radial and rectangular laser array beams are derived through vector integration and tensor operation. The irradiance properties of these laser array beams in a turbulent atmosphere are studied numerically. It is found that both phase-locked and non-phase-locked radial and rectangular laser array beams eventually become circular Gaussian beams in a turbulent atmosphere, which is much different from their propagation properties in free space. The propagation properties are closely related to the parameters of laser array beams and the structure constant of the turbulent atmosphere.
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    Article
    Citation Count: Chen, Y...et al. (2008). Scintillation properties of dark hollow beams in a weak turbulent atmosphere. Applied Physisc B-Lasers And Optics, 90(1), 87-92. http://dx.doi.org/10.1007/s00340-007-2825-1
    Scintillation properties of dark hollow beams in a weak turbulent atmosphere
    (Springer, 2008) Chen, Y.; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya; 7688; 7812
    The on-axis scintillation index for a circular dark hollow beam (DHB) propagating in a weak turbulent atmosphere is formulated, and the scintillation properties of a DHB are investigated in detail. The scintillation index for a DHB reduces to the scintillation index for a Gaussian beam, an annular beam and a flat-topped beam under certain conditions. It is found that the scintillation index of a DHB is closely related to the beam parameters and can be lower than that of a Gaussian beam, an annular beam and a flat-topped beam in a weak turbulent atmosphere at smaller waist sizes and longer propagation lengths