Abstract
In this paper, the propagation properties of a vortex cosh-Gaussian beam (vChGB) in turbulent atmosphere are investigated. Based on the extended Huygens–Fresnel diffraction integral and the Rytov method, the analytical expression for the average intensity of the vChGB propagating in the atmospheric turbulence is derived. The effects of the turbulent strength and the beam parameters on the intensity distribution and the beam spreading are illustrated numerically and analyzed in detail. It is shown that upon propagating, the incident vChGB keeps its initial hollow dark profile within a certain propagation distance, then the field loses gradually its central hole-intensity and transformed into a Gaussian-like beam for large propagation distance. The rising speed of the central peak is demonstrated to be faster when the constant strength turbulence or the wavelength are larger and the Gaussian width is smaller. The obtained results can be beneficial for applications in optical communications and remote sensing.
Highlights
In recent years, the propagation of laser beams in atmosphere have received a great attention from the laser researchers due to many applications such as the remote sensing, imaging, optics communications and so on [1,2]
The remainder of the manuscript is organized as follow: in the Second section, we present the theoretical analysis for the propagation of vortex cosine-hyperbolic Gaussian beam (vChGB) in turbulent atmosphere, and we derive the propagation equation of the average intensity distribution
The propagation characteristics of a vChGB propagating in turbulent atmosphere are investigated in detail
Summary
The propagation of laser beams in atmosphere have received a great attention from the laser researchers due to many applications such as the remote sensing, imaging, optics communications and so on [1,2]. The propagation characteristics of laser beams with various excitations in the atmospheric turbulence have been examined [3,4,5,6,7,8,9,10,11,12,13,14], and new beam models have been discovered and studied for their applications in free space optical communication systems. During the last few years, a great deal of attention has been paid to the propagation proprieties of hollow vortex beams in various optics medium owing to promote their applications in optical microscopy, wireless communications, micromanipulation, etc [16,17,18,19,20,21,22,23,24,25,26]. The propagation characteristics of the hollow vortex Gaussian beams in free space and in turbulent atmosphere have been investigated in details in Refs.
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