Transparent ceramics are at the heart of modern magneto-optical materials providing promising opportunities for Faraday isolators. 1.0 at% RE:Tb3Ga5O12 (rare earth (RE) = Pr, Tm, Dy) transparent ceramics were successfully prepared by air sintering and sequential HIP technique using the coprecipitated powders as the raw material. All the powders have shown to be a pure cubic terbium gallium garnet (TGG) phase and exhibit good dispersion. Additionally, a change could not be observed in particle shape with the different doped ions. After the two-step sintering, all the obtained ceramics have good optical quality, and the in-line transmittances at 1070 nm are higher than 80%. Moreover, no secondary phase can be detected from the microstructures. However, the pores which remain entrapped in the ceramics can be noted. The Verdet constant of ceramic samples is optimized by RE doping, and the Verdet constant at 632.8 nm is about −143 rad·T−1·m−1, which is about 5% higher than that of TGG ceramics. Finally, the thermo-optical properties of 1.0 at% RE:TGG transparent ceramics are compared. The annealed TGG ceramic showed the best thermo-optical properties, and the thermally induced depolarization of 1.0 at% Ce:TGG and 1.0 at% Tm:TGG was inferior to that of annealed TGG ceramic.
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This work was supported by the National Key R&D Program of China (Grant No. 2017YFB0310500), the NSFC-RFBR Cooperative Research Project (Grant No. 61911530135), and the Key Research Project of the Frontier Science of the Chinese Academy of Sciences (No. QYZDB-SSW-JSC022). This work was supported partially by the Ministry of High Education and Science of the Russian Federation and the State Task executed in the Institute of Applied Physics RAS (Project No. 00352019-0015).
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Li, X., Snetkov, I.L., Yakovlev, A. et al. Fabrication and performance evaluation of novel transparent ceramics RE:Tb3Ga5O12 (RE = Pr, Tm, Dy) toward magneto-optical application. J Adv Ceram 10, 271–278 (2021). https://doi.org/10.1007/s40145-020-0437-y
- magneto-optical material
- rare earth (RE):terbium gallium garnet (TGG) ceramics
- Verdet constant
- thermo-optical properties