1. State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser Spectroscopy Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan 030006 China
2. Key Laboratory of Spectral Measurement and Analysis of Shanxi Province College of Physics and Information Engineering Shanxi Normal University Linfen 041004 China
3. Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Materials Science & Engineering Beijing Institute of Technology Beijing 100081 China