Spectral shift of a partially coherent standard or elegant Laguerre–Gaussian beam in turbulent atmosphere

Abstract

Spectral changes of a partially coherent standard or elegant Laguerre–Gaussian (LG) beam propagating in turbulent atmosphere were studied numerically. Our results show that the spectral changes of a partially coherent standard or elegant LG beam in turbulent atmosphere are determined by both the structure constant of the turbulent atmosphere and the initial beam parameters. Furthermore, it is found that a partially coherent elegant LG beam is less affected by the turbulent atmosphere than a partially coherent standard LG beam from the aspect of the on-axis spectral shift, and this advantage is enhanced for small structure constant, small beam waist size, large mode orders, and large transverse coherence length. Our results will be useful in long-distance free-space optical communications.

Keywords:

• partially coherent beam
• turbulent atmosphere
• spectral shift

Acknowledgements

This work is supported by the National Natural Science Foundation of China under Grant Nos. 11104195 and 11274005, the Huo Ying Dong Education Foundation of China under Grant No. 121009, the Key Project of Chinese Ministry of Education under Grant No. 210081, the Universities Natural Science Research Project of Jiangsu Province under Grant 11KJB140007, the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, the Innovation Plan for Graduate Students in the Universities of Jiangsu Province under Grant Nos. CXLX12_0781 and CXLX11_0064, the Natural Science Foundation of Education Committee of Henan Province under Grant 12B140011, and the Project Sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.