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.