Vol. 25, issue 05, article # 2

Lukin I. P. Coherence of Bessel beam in the turbulent atmosphere. // Optika Atmosfery i Okeana. 2012. V. 25. No. 05. P. 393-402 [in Russian].
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Abstract:

In this article characteristic features of formation of the Bessel optical beam in turbulent atmosphere are analyzed. The problem of the analysis is based on the solution of the equation for the mutual coherence function of the second-order field of a Bessel beam of optical radiation. For average intensity of Bessel beam the condition, the which is the quantitative criterion of the possibility of formation of the given beam on an extended line in the turbulent atmosphere is derived. The behavior of a degree of coherence of the Bessel optical beam depending on parameters of a beam and characteristics of turbulent atmosphere is examined. It was revealed that at low levels of fluctuations in the turbulent atmosphere the degree of coherence of the Bessel optical beam has the characteristic oscillating appearance where the number of maxima and minima for identical level of the atmospheric turbulence unambiguously depends on Bessel beam parameter (a component of wave vector, orthogonal to a propagation direction of optical radiation). At high levels of fluctuations in the turbulent atmosphere the degree of coherence of a Bessel beam is described by an one-scale decreasing curve, which in process of increase of the level of fluctuations on the line of formation of a laser beam becomes closer to the similar characteristic of a spherical wave.

Keywords:

Bessel beam, optical radiation, atmospheric turbulence, average intensity, coherence