Vol. 5, issue 01, article # 5

pdf Banakh V. A., Vagner A. Z. Calculation of the variance of the strong intensity fluctuations for light beams propagating in the turbulent atmosphere. // Atmospheric and oceanic optics. 1992. V. 5. No. 01. P. 24-28.
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Based on the representation of a complex wave field amplitude in the form of functional integral, an asymptotic formula is derived and calculations of the relative variance of strong intensity fluctuations for light beams propagated in the turbulent atmosphere is performed for arbitrary diffraction parameters of the aperture and spatial coherence of a source. Relative contribution of terms of an asymptotic series of different order to the variance is analyzed by way of varying the parameters of diffraction and the initial coherence of the source. It is established that the above–described effect of exceeding the unity by the level of saturation of the variance for strong turbulence on a path, when the structure function of phase on the inner scale of turbulence is greater than unity, is found to occur only in the case in which the beam is focused with large apertures and does not occur for other conditions of diffraction.