Intensity and Coherence Characteristics of a Radial Phase-Locked Multi-Gaussian Schell-Model Vortex Beam Array in Atmospheric Turbulence

The theoretical descriptions for a radial phase-locked multi-Gaussian Schell-model vortex (RPLMGSMV) beam array is first given. The normalized intensity and coherence distributions of a RPLMGSMV beam array propagating in free space and atmospheric turbulence are illustrated and analyzed. The results show that a RPLMGSMV beam array with larger total number N or smaller coherence length sigma can evolve into a beam with better flatness when the beam array translating into the flat-topped profile at longer distance z and the flatness of the flat-topped intensity distribution can be destroyed by the atmospheric turbulence at longer distance z. The coherence distribution of a RPLMGSMV beam array in atmospheric turbulence at the longer distance will have Gaussian distribution. The research results will be useful in free space optical communication using a RPLMGSMV beam array.

Automated summary

The theoretical descriptions for a radial phase-locked multi-Gaussian Schell-model vortex beam array are presented, and the normalized intensity and coherence distributions are analyzed when propagating in free space and atmospheric turbulence. The results suggest that a larger total number or smaller coherence length can lead to better flatness in the beam array at longer distances, but atmospheric turbulence may affect this flatness. Additionally, the coherence distribution of the beam array in atmospheric turbulence at longer distances will have a Gaussian distribution.