Average transmittance of flat-topped beam in non-Kolmogorov medium

The average transmittance of flat-topped beam in non-Kolmogorov turbulence is investigated at the receiver origin. The formulation is based on the extended Huygens–Fresnel principle and the evaluations are made by numerical integration. It is found that as the power-law exponent, structure constant, propagation distance, source size and the degree of flatness of the flat-topped beam increase, the on-axis transmittance decreases. Transmittance decrease is substantial for high power-law exponent values and in strong turbulent regime. Increase in the wavelength of the flat-topped beam causes the average transmittance to increase.