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.
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)
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)
