Dan Li, Chunya Luo, Yebin Xu, Liang, Wu, Huaixing Wang, Songjie Shi, Furi Ling, Jianquan Yao,
http://www.sciencedirect.com/science/article/pii/S0925346717306729?via%3Dihub
The absorption coefficient of 0.65CaTiO3-0.35NdAlO3 ceramics under external optical fields was investigated by terahertz time-domain spectroscopy in a frequency range of 0.2 THz to 1 THz at room temperature. It could be found that the variation of the absorption coefficient is approximately from 8.95 cm−1 to 26.02 cm−1 in the frequency range of 0.2 THz to 1 THz, and the tuning range is about 3.32 cm−1 at 0.6 THz which almost reaches up to nearly 23.32%. The micromechanism of these results was attributed to the excited free carriers by the external optical pump intensity.
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