27 July 2016 LGS adaptive optics system with long-pulsed sodium laser on Lijiang 1.8 meter telescope 2014-2016 observation campaign
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Abstract
During 2014-2016, the Laser guide star (LGS) adaptive optics (AO) system observation campaign has been carried out on Lijiang 1.8 meter telescope. During the campaign, two generation LGS AO systems have been developed and installed. In 2014, a long-pulsed solid Sodium prototype laser with 20W@400Hz, a beam transfer optical (BTO) system, and a laser launch telescope (LLT) with 300mm diameter were mounted onto the telescope and moved with telescope azimuth journal. At the same time, a 37-elements compact LGS AO system had been mounted on the Bent-Cassegrain focus and got its first light on observing HIP43963 (mV= 8.18mv) and reached Sr=0.27 in J Band after LGS AO compensation. In 2016, the solid Sodium laser has been upgrade to stable 32W@800Hz while D2a plus D2b repumping is used to increase the photon return, and a totally new LGS AO system with 164-elements Deformable Mirror, Linux Real Time Controller, inner closed loop Tip/tilt mirror, Multiple-PMT tracking detector is established and installed on the telescope. And the throughput for the BTO/LLT is improved nearly 20%. The campaign process, the performance of the two LGS AO systems especially the latter one, the characteristics of the BTO/LLT system and the result are present in this paper.
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Kai Wei, Min Li, Changchun Jiang, Ling Wei, Wenjia Zheng, Wenru Li, Xiaoyu Ma, Luchun Zhou, Kai Jin, Yong Bo, Junwei Zuo, Pengyuan Wang, Feng Cheng, Xiaojun Zhang, Donghong Chen, Jijiang Deng, Yang Gao, Yu Shen, Qi Bian, Ji Yao, Jiang Huang, Ruoxi Dong, Keran Deng, Qinjun Peng, Changhui Rao, Zuyan Xu, Yudong Zhang, "LGS adaptive optics system with long-pulsed sodium laser on Lijiang 1.8 meter telescope 2014-2016 observation campaign", Proc. SPIE 9909, Adaptive Optics Systems V, 99095G (27 July 2016); doi: 10.1117/12.2231921; https://doi.org/10.1117/12.2231921
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