1. School of Automation and Information Engineering, Xi’an University of Technology, Xi’an, People’s Republic of China
2. Electronic Information School, Wuhan University, Wuhan, People’s Republic of China
3. School of Physics and Telecommunications Engineering, Shaanxi University of Technology, Hanzhong, People’s Republic of China
4. North China Research Institute of Electro-Optic Science and Technology on Solid-State Laser Laboratory, Beijing, People’s Republic of China