分类： 天文学 >> 天文学 提交时间： 2023-02-19
Lu Feng
Kai Jin
Hong-Yang Li
Bo-Tian Sun
Min Li
Rui-Tao Wang
Qi Bian
Chen Wang
Ming Wang
Yue Liang
Zhi-Xia Shen
Yang-Peng Li
Sui-Jian Xue
摘要： The brightness and height of the sodium laser guide star of adaptive optics could vary significantly due to the temporal dynamics of sodium column density and the mean height of sodium layer. To measure these dynamics, an independent sodium Lidar is a necessity. Without such an instrument, it is almost impossible to discern the cause of the brightness variation of laser guide star from the sodium layer's dynamics or other factors from the laser itself. For applications such as characterizing the performance of sodium laser for sodium laser guide star generation, minutes scale short term statistics of the sodium layers' abundance and height is extremely helpful for estimating the contribution of sodium layer's variation to the variation of laser guide star's brightness. In this paper, we analyzed our previous measurement of sodium layer dynamics that has been gathered in two winters, and presented the temporal variation statistics of sodium column density and mean height within minute time scale based on our measurements.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
摘要： In the past few years, Chinese astronomical community is actively testing astronomical sites for several new optical/infrared ground-based telescopes. These site testing campaigns conducted were mainly focused on fundamental performances of the site, such as cloud coverage, seeing, temperature, etc. With increasing interests in sodium laser guide star adaptive optics for these new telescopes in the Chinese astronomical community, it is interesting to investigate the performance of the laser guide star at these sites, especially considering that the sodium laser guide star's on-sky performance is significantly influenced by sites' local performances, such as geomagnetic field, sodium layer dynamics, density of air molecule, etc. In this paper, we studied sodium laser guide star's performance of a 20W class Quasi-CW pulsed laser developed by TIPC with numerical simulation for five selected sites in China.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Rui-Tao Wang
Hong-Yang Li
Lu Feng
Min Li
Qi Bian
Jun-Wei Zuo
Kai Jin
Chen Wang
Yue Liang
Ming Wang
Jun-Feng Dou
Ding-Wen Zhang
Kai Wei
You-Ming Guo
Yong Bo
Sui-Jian Xue
摘要： The application of sodium laser guide star is the key difference between modern adaptive optics system and traditional adaptive optics system. Especially in system like multi-conjugate adaptive optics, sodium laser guide star asterism which is formed by several laser guide stars in certain pattern is required to probe more atmospheric turbulence in different directions. To achieve this, a sodium laser guide star asterism launching platform is required. In this paper, we will introduce the sodium laser guide star asterism launching platform built and tested on the 1.8m telescope of the Gaomeigu Observatory. The platform has two functions: one is to compare the performance of sodium laser guide stars generated by different lasers at the same place; the other is to generate sodium laser guide star asterism with adjustable shape. The field test results at the beginning of 2021 verify the important role of the platform, which is also the first time to realize sodium laser guide star asterism in China.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Rui-Tao Wang
Hong-Yang Li
Lu Feng
Min Li
Qi Bian
Jun-Wei Zuo
Kai Jin
Chen Wang
Yue Liang
Ming Wang
Jun-Feng Dou
Ding-Wen Zhang
Kai Wei
You-Ming Guo
Yong Bo
Sui-Jian Xue
摘要： The application of sodium laser guide star is the key difference between modern adaptive optics system and traditional adaptive optics system. Especially in system like multi-conjugate adaptive optics, sodium laser guide star asterism which is formed by several laser guide stars in certain pattern is required to probe more atmospheric turbulence in different directions. To achieve this, a sodium laser guide star asterism launching platform is required. In this paper, we will introduce the sodium laser guide star asterism launching platform built and tested on the 1.8m telescope of the Gaomeigu Observatory. The platform has two functions: one is to compare the performance of sodium laser guide stars generated by different lasers at the same place; the other is to generate sodium laser guide star asterism with adjustable shape. The field test results at the beginning of 2021 verify the important role of the platform, which is also the first time to realize sodium laser guide star asterism in China.
点击量
待评议
点击量
下载量
评论
