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

作　　者：左志高 凌福日 马德才 吴亮 刘劲松 姚建铨 

机构地区：[1]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology [2]School of Optical and Electronic Information,Huazhong University of Science and Technology [3]Sino-French Institute of Nuclear Engineering & Technology,Sun Yat-Sen University [4]College of Precision Instrument and Opto-electronics Engineering,Tianjin University

出　　处：《Chinese Physics B》2013年第10期544-547,共4页中国物理B（英文版）

基　　金：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);the Fundamental Research Funds for the Central Universities,China (Grant Nos.2010MS041 and 2011TS001)

摘　　要：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.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.

关 键 词：near-stoichiometric LiNbO3 ：Mg TERAHERTZ absorption coefficient domain reversal 

分 类 号：O614.111[理学—无机化学]