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Terahertz optical constants of ytterbium-doped yttrium aluminum garnet crystals

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9 Author(s)
Tsai, Tsong-Ru ; Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, Taiwan 20224, Republic of China ; Chang, Chih-Fu ; Chen, Shi-Jie ; Tani, M.
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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 0.2 to 1.8 THz. 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.

Published in:

Journal of Applied Physics  (Volume:99 ,  Issue: 9 )