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19 September 2013 Influence of geomagnetic field for continuous wave (CW) laser excited sodium guide stars backward fluorescence intensity
Shao-peng Zhang, Hong-yan Wang, Wei-hong Hua, Yu Ning, Xiao-jun Xu
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Proceedings Volume 8905, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Sensing and Imaging and Applications; 89051E (2013) https://doi.org/10.1117/12.2034146
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China
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.
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Shao-peng Zhang, Hong-yan Wang, Wei-hong Hua, Yu Ning, and Xiao-jun Xu "Influence of geomagnetic field for continuous wave (CW) laser excited sodium guide stars backward fluorescence intensity", Proc. SPIE 8905, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Sensing and Imaging and Applications, 89051E (19 September 2013); https://doi.org/10.1117/12.2034146
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KEYWORDS
Magnetism
Sodium
Laser guide stars
Sodium guide stars
Continuous wave operation
Adaptive optics
Luminescence
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