Intensity Distribution of Partially Coherent Off-Axis Vortex Beam Propagating in Atmospheric Turbulence

Based on the extended Huygens-Fresnel principle, the analytical expressions for the intensity of partially coherent sinusoidal-Gaussian beams with Schell-model correlator in atmospheric turbulence along a slant path are derived, and used to study the evolution of intensity distribution of partially coherent sinusoidal-Gaussian beams, including partially coherent sin-Gaussian (SiG), cos-Gaussian (CoG), sinh-Gaussian (ShG), cosh-Gaussian (ChG) beams. It is shown that the different intensity distribution at the source plane of the four beams evolve to the same Gaussian distribution in atmospheric turbulence along a slant path. The spreading of the partially coherent sinusoidal-Gaussian beams along a horizontal path is larger than that along a slant path in the long atmospheric propagation, and the slant path is more beneficial to the beam propagation through atmospheric turbulence in comparison with the horizontal propagation. The validity of our results is interpreted physically. Results in this paper may provide potential applications in free-space optical communications.

Download Full-text

Comparative study of partially coherent vortex beam propagations through atmospheric turbulence along a uplink path and a downlink path

Acta Physica Sinica ◽

10.7498/aps.60.074205 ◽

2011 ◽

Vol 60 (7) ◽

pp. 074205

Author(s):

Li Jin-Hong ◽

Lyu Bai-Da

Keyword(s):

Comparative Study ◽

Atmospheric Turbulence ◽

Vortex Beam ◽

Partially Coherent ◽

Coherent Vortex

Download Full-text

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

Photonics ◽

10.3390/photonics8010005 ◽

2020 ◽

Vol 8 (1) ◽

pp. 5

Author(s):

Jialu Zhao ◽

Guiqiu Wang ◽

Xiaolu Ma ◽

Haiyang Zhong ◽

Hongming Yin ◽

...

Keyword(s):

Atmospheric Turbulence ◽

Optical Communication ◽

Intensity Distribution ◽

Free Space ◽

Vortex Beam ◽

Free Space Optical Communication ◽

Free Space Optical ◽

Beam Array ◽

Space Optical Communication ◽

Radial Phase

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 σ 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.

Download Full-text