1. School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China
2. Photonics Information Innovation Center, Hebei Provincial Center for Optical Sensing Innovations, College of Physics Science and Technology, Hebei University, Baoding, China
3. Key Lab of Solid State Laser, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China
4. College of Electrical Engineering, Hebei University of Architecture, Zhangjiakou, Hebei, China