Propagation properties of partially coherent vortex cosine-hyperbolic-Gaussian beams through oceanic turbulence

Abstract

Abstract In this paper, we investigated the propagation properties of a partially coherent vortex cosine-hyperbolic-Gaussian beam (PCvChGB) propagating in weak oceanic turbulence. We established the analytical expression of the average intensity of the PCvChGB based on the Huygens-Fresnel integral and Rytov theory. The obtained numerical results indicate that the PCvChGB may propagate within longer distances when the dissipation rate of mean-square temperature or the ratio of temperature to salinity contribution to the refractive index spectrum is increased as well as the dissipation rate of turbulent kinetic energy per unit mass of seawater is increased. The influence of oceanic turbulence on the spreading properties of a PCvChGB is related to the initial beam parameters, such as the decentered parameter b, topological charge M, and coherence length. A comparison of the beam profile evolution in oceanic turbulence and free space is presented in detail for the different parameters involved. The obtained results can be beneficial for applications in optical underwater communication and remote sensing domains.