1. Key Laboratory of Photonic Materials and Devices Physics for Oceanic Applications Ministry of Industry and Information Technology of China College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin 150001 China
2. Key Laboratory of In‐Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin 150001 China
3. 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 South China University of Technology Guangzhou Guangdong 511442 China
4. Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China