The dielectric behaviour of doped near-stoichiometric lithium niobate in the terahertz range  

作　　者：Wu Liang Ling Fu-Ri Zuo Zhi-Gao Liu Jin-Song Yao Jian-Quan 吴亮;凌福日;左志高;刘劲松;姚建铨(Wuhan National Laboratory for Optoelectronics,School of Optoelectronic Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]Wuhan National Laboratory for Optoelectronics,School of Optoelectronic Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Tianjin 300072,China

出　　处：《Chinese Physics B》2012年第1期476-481,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.10974063);the Research Foundation of Wuhan National Laboratory,China(Grant No.P080008);the National Basic Research Program of China(Grant No.2007CB310403)

摘　　要：The dielectric properties of near-stoichiometric LiNbO3：Fe and LiNbO3：Ce single crystals have been investigated using terahertz time domain spectroscopy in a frequency range of 0.71.6 THz at room temperature. When coupled with an applied external optical field, obvious photorefractive effects were observed, resulting in a modulation of the complex dielectric constant for the crystals. The variation in refractive index, ｜△n｜, had a linear relationship with the applied light intensity, accompanied by a step-like decrease at high intensity. The findings were attributed to the internal space charge field of the photorefraction and the light-induced domain reversal in the crystals.The dielectric properties of near-stoichiometric LiNbO3：Fe and LiNbO3：Ce single crystals have been investigated using terahertz time domain spectroscopy in a frequency range of 0.71.6 THz at room temperature. When coupled with an applied external optical field, obvious photorefractive effects were observed, resulting in a modulation of the complex dielectric constant for the crystals. The variation in refractive index, ｜△n｜, had a linear relationship with the applied light intensity, accompanied by a step-like decrease at high intensity. The findings were attributed to the internal space charge field of the photorefraction and the light-induced domain reversal in the crystals.

关 键 词：near-stoichiometric LiNbO3 TERAHERTZ PHOTOREFRACTION domain reversal 

分 类 号：O614.111[理学—无机化学]