1. State Key Laboratory of High Power Semiconductor Laser, School of physics, Changchun University of Science and Technology, Changchun 130022, P. R. China
2. Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
3. Semiconductor Laser and Application Laboratory, Zhongshan Institute of Changchun University of Science and Technology, Zhongshan, 528437, P. R. China
4. College of Optics and Electronic Science and Technology, China Jiliang University, Hangzhou, 310018, P. R. China