1. Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Department of Astronomy, Beijing Normal University, Beijing 100875, China
4. IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
5. Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
6. Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China