1 School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China
2 Ministry of Industry and Information Technology, Key Laboratory of Advanced Solid Laser, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China
3 School of Science, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China