1. Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
2. University of Chinese Academy of Sciences, Beijing 100039, People's Republic of China
3. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, People's Republic of China
4. School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei 230009, People's Republic of China
5. State Key Laboratory of Optical Fibre and Cable Manufacture Technology, Strategy Center, YOFC, Wuhan 430073, People's Republic of China