Abstract

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

© 2012 Optical Society of America

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