[Peng, Yu-Xiang; Li, Ze-Jun; Wang, Kai-Jun; He, Meng-Dong; Li, Shui; Li, Jian-Bo] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410018, Hunan, Peoples R China.
[Chen, Xiaoshuang; He, Meng-Dong; Hu, Wei-Da] Chinese Acad Sci, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China.
[Liu, Jian-Qiang] Jiujiang Univ, Coll Sci, Jiujiang 332005, Peoples R China.
[Long, Mengqiu] Cent S Univ, Sch Phys & Elect, Changsha 410083, Peoples R China.