Abstract
The source of the curious exact agreement between the predictions of the disparate approaches of weak and strong fluctuation theory for the mutual coherence functions of plane and spherical wave propagation is identified. It is found that the linear approximation of the Ricatti equation that results within the Rytov method reduces to the parabolic equation of strong fluctuation theory only for the plane and spherical wave cases. Such a reduction does not prevail for the general beam wave case.
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