[1] Tianjin Univ, Inst Laser & Optoelect, Coll Precis Instrument & Optoelect Engn, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Minist Educ, Key Lab Optoelect Informat Sci & Technol, Tianjin 300072, Peoples R China
[3] N China Univ Water Resources & Elect Power, Zhenzhou 450011, Peoples R China