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Proceedings Paper

Effect of beam wander on the scintillation characterization for multiple beams
Author(s): Wu-ming Wu; Quan Sun; Guang-sen Ren; Yu Ning; Rui Du; Yi Wu
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Paper Abstract

An 4km optical link was established to examine the effect of beam wander on the scintillation characterization for multiple focus beams. Multiple beams that sample different portions of the atmosphere reduce the scintillation if the atmospheric turbulence each beam traverses is independent. How much the beam wander affects scintillation is determined by the number of the beams and the size of the beam wander variance. The number of mutually incoherent beams was 1, 3 or 6. Individual laser was launched from a separate region of the transmitter and focused on the flat screen with the horizontal distance of 4km by 350mm telescope. We recorded the illuminated flat screen with a CCD camera operating at 1kHz. We calculated the scintillation index of the illuminated area with the size of 8x8cm on the condition of untracked and tracked beams. A tracked beam generally refers to the situation in which the beam is tilt-corrected. However, There was no tilt-corrected in the experiment. Instead, the rms beam centroid of the area was aligned with the optical axis at each frame. Experimental results show that the scintillation index in tracked beam was larger than in the untracked beam case when the size of the Rytov variance σ2R is the same for one beam case, but for three and six beams, the scintillation values are almost. It is the reason that the root mean square variance of wander angle decreases as the number of beams increases. So the effect of beam wander is not evident for three and six beams. And increasing the number of beams on the condition of untracked and tracked cases does reduce the scintillation index as predicted.

Paper Details

Date Published: 21 August 2013
PDF: 6 pages
Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 890609 (21 August 2013); doi: 10.1117/12.2031738
Show Author Affiliations
Wu-ming Wu, Anhui Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
National Univ. of Defense Technology (China)
Quan Sun, National Univ. of Defense Technology (China)
Guang-sen Ren, National Univ. of Defense Technology (China)
Yu Ning, National Univ. of Defense Technology (China)
Rui Du, National Univ. of Defense Technology (China)
Yi Wu, Anhui Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 8906:
International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems
Keith E. Wilson; Jing Ma; Liren Liu; Huilin Jiang; Xizheng Ke, Editor(s)

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