Analysis of Bessel vortex Gaussian beam propagation properties

The quality of the Bessel vortex Gaussian beam (BVGB) while propagating in a turbulent atmosphere is investigated. To the best of our knowledge, the propagation properties of BVGBs propagating in turbulent atmosphere are not studied yet. Accordingly, this study aims to analyse its behaviour by examining the beam size, kurtosis parameters and scintillation properties along the propagation path. In this context, the beam size, a kurtosis parameter and scintillation properties of BVGB propagating 6 Km are examined. The impact of topological charge and source size on the variation of beam size, kurtosis and scintillation parameters against the propagation distance is studied. The obtained results show that BVGBs with bigger source sizes spread less while propagating up to 1 Km. However, beams with small source sizes spread less as the propagation distance increases. On the other hand, BVGBs with higher topological charges spread more than the Bessel Gaussian beam. Moreover, as the topological charge increases the sharpness of BVGBs increases then beams start to flatter at higher topological charges. Whereas, BVGBs with bigger source sizes are flatter than the ones with smaller source sizes and also flatter than Bessel beams. In addition, Examining the scintillation effect at a certain propagation distance in a turbulent atmosphere shows that BVGBs can maintain their beam profiles when they have higher topological charges. The obtained results will help understand the behaviour of BVGBs in free-space optical communication systems. Thus, it will be beneficial in improving system performance in a wide range of applications. Keywords: Bessel Gaussian vortex beam, Beam quality, Turbulence