Abstract-The effect of optical pump on the absorption coefficient of 0.65CaTiO3-0.35NdAlO3 ceramics in terahertz range

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.

Abstract-Effect of optical pumping on the dielectric properties of 0.6CaTiO3-0.4NdAlO3 ceramics in the terahertz range

Dan Li, Chunya Luo, Yebin Xu, Jing Zhang, Liang Wu, Huaixing Wang, Songjie Shi, Furi Ling, and Jianquan Yao

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-57-1-1&origin=search

The dielectric properties of 0.6CaTiO3-0.4NdAlO3$0.6{\mathrm{CaTiO}}_3\text{-}0.4{\mathrm{NdAlO}}_3$ ceramics under external optical fields were 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 real part of complex permittivity is approximately 0.31 in the frequency range of 0.2 THz to 1 THz. However the imaginary part of the dielectric constant does not change appreciably with the external optical field. The micromechanism of these results was attributed to the built-in electric field caused by the excited free carriers in the ceramics.

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