The effect of an optical pump on the absorption coefficient of magnesium-doped near-stoichiometric lithium niobate in terahertz range

doi:10.1088/1674-1056/22/10/107802

Abstract The absorption coefficient of magnesium-doped near-stoichiometric lithium niobate crystal is measured by terahertz time-domain spectroscopy in a frequency range of 0.2 THz-0.9 THz at room temperature. The absorption coefficient is modulated by external optical pump fields. Experimental results show that the absorption coefficient of near-SLN:Mg crystal is approximately in a range of 22 cm^-1-35 cm^-1 in a frequency range of 0.2 THz-0.9 THz and tunable up to nearly 15%. Further theoretical analysis reveals that the variation of absorption coefficient is related to the number of light-induced carriers, domain reversal process, and OH^- absorption in this crystal.

Keywords: near-stoichiometric LiNbO₃：Mg terahertz absorption coefficient domain reversal

Received: 08 March 2013
Revised: 02 April 2013
Accepted manuscript online:

PACS:	78.20.Mg	(Photorefractive effects)
	42.70.Mp	(Nonlinear optical crystals)
	87.50.U-

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10974063, 61205096, and 61177095), the Natural Science Foundation of Hubei Province, China (Grant Nos. 02-16-230008, 2010CDA001, and 2012FFA074), the Research Foundation of Huazhong University of Science and Technology, China (Grant No. 01-09-230904), the Ph. D. Program Foundation of Ministry of Education of China (Grant No. 20100142110042), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. 2010MS041 and 2011TS001).

Corresponding Authors: Ling Fu-Ri
E-mail: lingfuri@163.com

Cite this article:

Zuo Zhi-Gao (左志高), Ling Fu-Ri (凌福日), Ma De-Cai (马德才), Wu Liang (吴亮), Liu Jin-Song (刘劲松), Yao Jian-Quan (姚建铨) The effect of an optical pump on the absorption coefficient of magnesium-doped near-stoichiometric lithium niobate in terahertz range 2013 Chin. Phys. B 22 107802

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The effect of an optical pump on the absorption coefficient of magnesium-doped near-stoichiometric lithium niobate in terahertz range

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