[1] College of Physics, University-Industry Joint Center for Ocean Observation and Broadband Communication, Qingdao University, Qingdao,266071, China
[2] Weihai Innovation Research Institute of Qingdao University, Weihai,264200, China
[3] Qingdao Broadband Terahertz Spectroscopy Technology Engineering Research Center (Qingdao University), Qingdao,266071, China
[4] Shandong Crystal Laser Technology Co. Ltd, Weihai,264200, China
[5] Crystech Inc, Qingdao,266107, China