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A sodium laser guide star coupling efficiency measurement method

Feng, Lu and Shen, Zhi-Xia and Xue, Suijian and Li, Yang-Peng and Jin, Kai and Otarola, Angel and Bo, Yong and Zuo, Jun-Wei and Bian, Qi and Wei, Kai and Hu, Jing-Yao (2016) A sodium laser guide star coupling efficiency measurement method. Research in Astronomy and Astrophysics, 16 (9). Art. No. 012. ISSN 1674-4527.

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A large telescope's adaptive optics (AO) system requires one or more bright artificial laser guide stars to improve its sky coverage. The recent advent of a high power sodium laser is perfect for such application. However, besides the output power, other parameters of the laser also have a significant impact on the brightness of the generated sodium laser guide star, mostly in non-linear relationships. When tuning and optimizing these parameters it is necessary to tune based on a laser guide star generation performance metric. Although return photon fluxis widely used, variability of the atmosphere and sodium layer makes it difficult to compare results from different sites or even within a short time period for the same site. A new metric, coupling efficiency, is adopted in our field tests. In this paper, we will introduce our method for measuring the coupling efficiency of a 20W class pulse sodium laser for AO application during field tests that were conducted during 2013–2015.

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Additional Information:© 2016 IOP Publishing. Received 15 April 2016; Accepted 18 May 2016. This work was supported by the National Natural Science Foundation of China (11303056, 11273002), the NAOC astronomical financial special fund (Y533061V01), and Key Laboratory of Optical Astronomy, CAS. We acknowledge help from Xing Long and Gao Mei Gu Observatories. We greatly appreciate helps from Prof. Wang Ji Hong and Prof. Yang Guo Tao from National Space Science Center for their sodium Lidar support, Dr. Jia Ming Jiao from University of Science and Technology of China for his support in Lidar raw data analysis.
Group:Thirty Meter Telescope
Funding AgencyGrant Number
National Natural Science Foundation of China11303056
National Natural Science Foundation of China11273002
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)Y533061V01
Subject Keywords:instrumentation: adaptive optics; methods: observational; atmospheric effects
Issue or Number:9
Record Number:CaltechAUTHORS:20161111-082216147
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Official Citation:Lu Feng et al 2016 Res. Astron. Astrophys. 16 144
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71926
Deposited By: Tony Diaz
Deposited On:15 Nov 2016 01:49
Last Modified:03 Oct 2019 16:12

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