1. School of Science, International Joint Research Center for Nanophotonics and Biophotonics, Changchun University of Science and Technology, 7089 Wei-Xing Road, Changchun 130022, People's Republic of China
2. State key laboratory of high power semiconductor lasers, Changchun University of Science and Technology, 7089 Wei-Xing Road, Changchun 130022, People's Republic of China