1. Terahertz Technology Innovation Research Institute, Shanghai Key Lab of Modern Optical System and Shanghai Cooperation Innovation Centre of Terahertz Spectroscopy and Imaging Technology, University of Shanghai for Science and Technology, Shanghai, China
2. State Key Lab of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan, China
3. Center for Advanced Measurement Science, National Institute of Metrology, Beijing, China