Intensity fluctuations of flat-topped beam in non-Kolmogorov weak turbulence: comment

摘要

In J. Opt. Soc. Am. A 29, 169 (2012), Gercekcioglu and Baykal presented an investigation of the dependence of the scintillation index of flat-topped Gaussian beams on the exponent α of the power-law-type spectra of non-Kolmogorov turbulence. In particular, they found that the scintillation index reaches a maximum at α ≈ 3.2. We show that this conclusion is an artifact of their specific calculation, and depends on the choice of the length unit. Gercekcioglu and Baykal's calculations are made for the 3 < α < 5 range of the spectral exponent. We show that for the homogeneous and isotropic turbulence the correct range is 3 < α < 4, when Markov approximation is used.