1. Harbin Institute of Technology, Institute of Opto-Electronics, National Key Laboratory of Science and Technology on Tunable Laser, No. 2, YiKuang Street, Harbin 150080, ChinabQiqihar University, College of Applied Technology, No. 42 Culture Street, Qiqiha
2. Harbin Institute of Technology, Institute of Opto-Electronics, National Key Laboratory of Science and Technology on Tunable Laser, No. 2, YiKuang Street, Harbin 150080, China