8 October 2015 Scintillation reduction by multiple phase-locked beams with different polarization angles
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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 σI2 and mean received intensity ⟨I⟩ for the beams array propagating through weak, moderate, and strong turbulence. The effects of different polarization angles on σI2 and ⟨I⟩ at the receiver are studied. When the turbulence is weak, numerical calculations show that both σI2 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.
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Guangsen Ren, Guangsen Ren, Rongzhen Zhu, Rongzhen Zhu, Daoliang Hao, Daoliang Hao, Mei Yao, Mei Yao, Yanbin Wang, Yanbin Wang, Wenpan Zhang, Wenpan Zhang, Hua Li, 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); doi: 10.1117/12.2199188; https://doi.org/10.1117/12.2199188
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