Terahertz optical constants of ytterbium-doped yttrium aluminum garnet crystals

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作者
Tsai, Tsong-Ru [1 ]
Chang, Chih-Fu [1 ]
Chen, Shi-Jie [1 ]
Tani, Masahiko [2 ]
Yamaguchi, Mariko [2 ]
Sumikura, Hisashi [2 ]
Chiang, Hai-Pang [1 ,3 ]
Chen, Yuan-Fan [3 ]
Tse, Wan-Sun [3 ]
机构
[1] Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, 20224, Taiwan
[2] Institute of Laser Engineering, Osaka University, Osaka 5650871, Japan
[3] Institute of Physics, Academia Sinica, Taipei, 115, Taiwan
来源
Journal of Applied Physics | 2006年 / 99卷 / 09期
关键词
Terahertz time-domain spectroscopy has been employed to measure the optical constants of ytterbium-doped yttrium aluminum garnet (Ybx Y1-x) 3 Al5 O12 (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. © 2006 American Institute of Physics;
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