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Proceedings Paper

Influence of geomagnetic field for continuous wave (CW) laser excited sodium guide stars backward fluorescence intensity
Author(s): Shao-peng Zhang; Hong-yan Wang; Wei-hong Hua; Yu Ning; Xiao-jun Xu
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Paper Abstract

Recent years, benefited from their greater coverage and smaller focus anisoplanatism, sodium laser guide stars are becoming more attractive in providing artificial beacons for adaptive optical (AO) system in large ground telescopes compared to Rayleigh guide stars. And it had been found that the Sodium laser guide stars backward fluorescence intensity is closely related with the local magnetic field intensity and direction. In this paper, we make use of the World Magnetic Model (WMM) 2010 and by considering the geographical differences in Beijing, Nanjing and Kunming we investigate the effects of the light intensity, line-width, polarization of the CW laser and re-pumping conditions on the photon return flux by numerically solving the Rochester et al. Bloch model. So in theory we can get better Sodium guide star in Beijing. In conclusion, according to the simulation results, we can acquire much bright of Sodium guide stars by optimize the parameter of the launched 589 nm laser.

Paper Details

Date Published: 19 September 2013
PDF: 7 pages
Proc. SPIE 8905, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Sensing and Imaging and Applications, 89051E (19 September 2013); doi: 10.1117/12.2034146
Show Author Affiliations
Shao-peng Zhang, National Univ. of Defense Technology (China)
Hong-yan Wang, National Univ. of Defense Technology (China)
Wei-hong Hua, National Univ. of Defense Technology (China)
Yu Ning, National Univ. of Defense Technology (China)
Xiao-jun Xu, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 8905:
International Symposium on Photoelectronic Detection and Imaging 2013: Laser Sensing and Imaging and Applications
Farzin Amzajerdian; Astrid Aksnes; Weibiao Chen; Chunqing Gao; Yongchao Zheng; Cheng Wang, Editor(s)

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