Affiliation: | 1. 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, P.R. China;2. School of Physics & Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, P.R. China;3. College of Optical Science and Engineering, Zhejiang University, Hangzhou, P.R. China |