Open AccessTwisted partially coherent array sources and their transmission in anisotropic turbulence
Author(s) -
Jing Wang,
Hongkun Huang,
Yikai Chen,
Haiyan Wang,
Shiqun Zhu,
Zhenhua Li,
Yangjian Cai
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.025974
Subject(s) - physics , mutual coherence , optics , superposition principle , degree of coherence , turbulence , coherence (philosophical gambling strategy) , anisotropy , beam (structure) , gaussian beam , rotation (mathematics) , gaussian , geometry , mathematics , quantum mechanics , mechanics
A new class of twisted Schell-model array correlated sources are introduced based on Mercer's expansion. It turns out that such sources can be expressed as superposition of fully coherent Laguerre-Gaussian modes, and the twistable condition is established. Furthermore, on the basis of a stretched coordinate system and a quadratic approximation, analytical expressions for the mutual coherence function of an anisotropic non-Kolmogorov turbulence and the cross-spectral density of a twisted Gaussian Schell-model array beam are rigorously derived. Due to the presence of the twist phase, the beam spot and the degree of coherence rotate as they propagate, but their rotation centers are different. It is shown that the anisotropy of turbulence causes an anisotropic beam spreading in the horizontal and vertical directions. However, impressing a twist phase on source beams can significantly inhibit this effect. For an anticipated atmospheric channel condition, a comprehensive selection of initial optical signal parameters, receiver aperture size and receiver capability, etc., is necessary. Our work is helpful for exploring new forms of twistable sources, and promotes guidance on optimization of partial coherent beam applications.