Institution: | 1Institute of Laser and Optoelectronics, College of Precision Instrument and Optoelectronic Engineering, Tianjin University, Tianjin 300072;2Key Laboratory of Optoelectronic Information Science and Technology (Ministry of Education), Tianjin University, Tianjin 300072;3National Key Lab of High Power Semiconductor Laser, Changchun University, Changchun 130022) |