1. State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System and the School of Science, Harbin Institute of Technology, Shenzhen, University Town, Shenzhen, Guangdong 518055, P. R. China
2. Education Center of Experiments and Innovations, Harbin Institute of Technology, Shenzhen, University
Town, Shenzhen, Guangdong 518055, P. R. China