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.
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)
