1. State Key Laboratory of Luminescent Materials and Devices Institute of Optical Communication Materials Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques School of Materials Science and Engineering South China University of Technology Guangzhou 510641 China
2. School of Applied Physics and Materials Wuyi University Jiangmen 529000 China
3. School of Physics and Optoelectronics Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology Guangzhou 510641 China