1. State Key Laboratory of High Power Semiconductor Laser Changchun University of Science and Technology 7186 Wei-Xing Road Changchun 130022 P. R. China
2. State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University 2699 Qian-Jin Street Changchun 130012 P. R. China
3. State Key Laboratory of Luminescence and Applications Changchun Institute of Optics, Fine Mechanics and Physics Chinese Academy of Sciences 3888 Dongnanhu Road Changchun 130021 P. R. China