Scintillation reduction by multiple phase-locked beams with different polarization angles

Guangsen Ren; Rongzhen Zhu; Daoliang Hao; Mei Yao; Yanbin Wang; Wenpan Zhang; Hua Li

doi:10.1117/12.2199188

8 October 2015 Scintillation reduction by multiple phase-locked beams with different polarization angles

Guangsen Ren, Rongzhen Zhu, Daoliang Hao, Mei Yao, Yanbin Wang, Wenpan Zhang, Hua Li

Proceedings Volume 9678, AOPC 2015: Telescope and Space Optical Instrumentation; 96780J (2015) https://doi.org/10.1117/12.2199188
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

A new approach is presented to reduce turbulence-induced scintillation by use of a phase-locked beams array composed of linearly polarized beams with different polarization angles. The noninterference of orthogonal polarizations suggests that the beams array mentioned above can act effectively as a two-mode partially coherent beam, and the percentage of a single mode is controllable by changing the polarization angles of the beams. Numerical calculation using a multiple-phase screen method is performed to analyze the on-axis scintillation index σ_I² and mean received intensity ⟨I⟩ for the beams array propagating through weak, moderate, and strong turbulence. The effects of different polarization angles on σ_I² and ⟨I⟩ at the receiver are studied. When the turbulence is weak, numerical calculations show that both σ_I² and ⟨I⟩ are closely related to the polarization angles of the beams. And there will be a smaller scintillation index for a phase-locked beams array comprising beams with different polarization angles as compared to a uniformly polarized beams array. As the beams are phase-locked, the mean received intensity provided by them is larger than that provided by an incoherent beams array. For it is quite easy to change the polarization angles, phase-locked beams array comprising beams with different polarization angles can be a promising source in the applications that need a balance between scintillation and mean received intensity in weak turbulence conditions. When the turbulence is moderately strong, incoherent beams array is actually a better choice, because the scintillation index is smaller and the mean received intensity is as much, compared to a phase-locked beams array.

Citation Download Citation

Guangsen Ren, Rongzhen Zhu, Daoliang Hao, Mei Yao, Yanbin Wang, Wenpan Zhang, and Hua Li "Scintillation reduction by multiple phase-locked beams with different polarization angles", Proc. SPIE 9678, AOPC 2015: Telescope and Space Optical Instrumentation, 96780J (8 October 2015); https://doi.org/10.1117/12.2199188

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