Optical modulation of permittivity for different doped near stoichiometric lithium niobate in the terahertz range

Liang Wu; Furi Ling; Jinsong Liu; Jianquan Yao

doi:10.1117/12.918092

13 March 2012 Optical modulation of permittivity for different doped near stoichiometric lithium niobate in the terahertz range

Liang Wu, Furi Ling, Jinsong Liu, Jianquan Yao

Author Affiliations +

Proceedings Volume 8330, Photonics and Optoelectronics Meetings (POEM) 2011: Laser and Terahertz Science and Technology; 83300N (2012) https://doi.org/10.1117/12.918092
Event: Photonics and Optoelectronics Meetings 2011, 2011, Wuhan, China

Abstract

The dielectric properties of near-stoichiometric LiNbO3:Fe and LiNbO3:Ce single crystals have been investigated by using a terahertz time domain spectroscopy (THz-TDS) in a frequency range of 0.4-1.8 THz at room temperature. When coupled with an applied external optical field, obvious photorefractive effects were observed, resulting in the modulation of the complex dielectric constant for the crystals, and reached up to 3%. However, the dielectric loss does not change appreciably. These findings were attributed to the change of spontaneous polarization in the crystals caused by the internal space charge field of photorefraction.

Citation Download Citation

Liang Wu, Furi Ling, Jinsong Liu, and Jianquan Yao "Optical modulation of permittivity for different doped near stoichiometric lithium niobate in the terahertz range", Proc. SPIE 8330, Photonics and Optoelectronics Meetings (POEM) 2011: Laser and Terahertz Science and Technology, 83300N (13 March 2012); https://doi.org/10.1117/12.918092

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