1College of Electronic and Optical Engineering, College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing, Jiangsu 210046, China
2Advanced All Solid State Laser Technology R&D Center, Nanjing Institute of Advanced Laser Technology, Nanjing, Jiangsu 210046, China;
3Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China