title: Inner scale effect on scintillation index of flat-topped beam in non-Kolmogorov weak turbulence.
abstract: A simpler generalized expression of irradiance fluctuation for flat-topped beams is presented based on the Born and Rytov perturbation methods. The theoretical expression of the on-axis scintillation index in non-Kolmogorov weak atmospheric optics links is developed using the generalized von Kármán spectrum model, and using the equivalent structure constant that is different for all power-law exponents. The effect of the inner scale on the on-axis scintillation index is examined comprehensively. It is observed that flat-topped beams happen to possess smaller scintillation indices at larger inner scale. The effects of the power law, flat-topped order, source size of the fundamental Gaussian beam, propagation distance, and wavelength are also analyzed.
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Zeng
authors.forename: Xiujuan
authors.initials: X
authors.lastname: Luo
authors.forename: Aili
authors.initials: A
authors.lastname: Xia
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Bei
authors.initials: B
authors.lastname: Cao