Terahertz optical constants of ytterbium-doped yttrium aluminum garnet crystals

Terahertz time-domain spectroscopy has been employed to measure the optical constants of ytterbium-doped yttrium aluminum garnet (YbxY1−x)3Al5O12 (Yb:YAG) crystals for nominal x values of 0.0, 0.1, 0.2, 0.5, 0.8, and 1.0 in the frequency range from 0.2to1.8THz. The real refractive indices for Yb:YAG...

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Bibliographic Details
Published in:Journal of applied physics 2006-05, Vol.99 (9)
Main Authors: Tsai, Tsong-Ru, Chang, Chih-Fu, Chen, Shi-Jie, Tani, Masahiko, Yamaguchi, Mariko, Sumikura, Hisashi, Chiang, Hai-Pang, Chen, Yuan-Fan, Tse, Wan-Sun
Format: Article
Language:English
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Summary:Terahertz time-domain spectroscopy has been employed to measure the optical constants of ytterbium-doped yttrium aluminum garnet (YbxY1−x)3Al5O12 (Yb:YAG) crystals for nominal x values of 0.0, 0.1, 0.2, 0.5, 0.8, and 1.0 in the frequency range from 0.2to1.8THz. The real refractive indices for Yb:YAG crystals increase linearly with the concentration of Yb3+. The experimental results can be fitted by the Sellmeier equation. The results imply that the phonon modes of the Yb:YAG crystals shift to lower frequencies with substitution of Yb for Y. The extinction coefficients of the Yb:YAG crystals are smaller than 0.05.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2195891