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Coherence degree of a Laguerre-Gaussian laser beam backscattered on a diffuse target in turbulent atmosphere

The paper presents the results of the study of the coherence properties of vortex Laguerre-Gaussian beams backscattered on a diffuse target on monostatic location paths in a turbulent atmosphere. In the weak intensity fluctuations approximation the modulus of complex degree of coherence was calculated for the backscattered vortex beam. It is shown that vortex beam coherence is less than for the Gaussian beam, except of the limit of the point reflector. The value of topological charge of a vortex laser beam remains in the mutual coherence function of a backward wave, but has a weak effect on the dependence of coherence length of the backward wave on the way of separating the observation points. The sign of the topological charge is also present in the expression for the modulus of the complex coherence of the backscattered radiation, but is not significant in its functional behaviour.