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

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

range

Wu Liang;Ling Fu-Ri;Zuo Zhi-Gao;Liu Jin-Song;Yao Jian-Quan

【期刊名称】《中国物理：英文版》 【年(卷),期】2012(021)001

【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 0.7-1.6 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,[An[,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.

【总页数】6页(476-481) 【关键词】

【作者】Wu Liang;Ling Fu-Ri;Zuo Zhi-Gao;Liu Jin-Song;Yao Jian-Quan 【作者单位】Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering,Huazhong University of Science