1. Institute
of Modern Optics, Nankai University, Key Laboratory of Optical Information Science and Technology, Ministry of Education, Tianjin 300071, China
2. Shanghai
Key Laboratory of Modern Optical System, College of Optics and Electronic
Information Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
3. State
Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
4. Cooperative Innovation
Centre of Terahertz Science, No. 4,
section 2, North Jianshe Road, Chengdu 610054, China