Wandering laser beam in a turbulent atmosphere. I. Distribution of the probability density of the fluctuation power

Expressions are obtained for the distribution of the probability and moments of the distribution of intensity fluctuations in the case of wandering of a laser beam which itself exhibits log-normal fluctuations. The nature of the distribution and the values of the moments depend on two parameters: one represents the strength of log-normal fluctuations and the other the strength of fluctuations resulting from wandering of the beam.