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5. Thermo-Optical Studies of Laser Ceramics

Author

Palashov, Oleg V., primary, Starobor, Aleksey V., additional, Perevezentsev, Evgeniy A., additional, Snetkov, Ilya L., additional, Mironov, Evgeniy A., additional, Yakovlev, Alexey I., additional, Balabanov, Stanislav S., additional, Permin, Dmitry A., additional, and Belyaev, Alexander V., additional

Published
2021
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11. Fabrication and Magneto-Optical Properties of Yb2O3 Based Ceramics.

Author

Permin, Dmitry A., Novikova, Anastasia V., Koshkin, Vitaly A., Balabanov, Stanislav S., Snetkov, Ilya L., Palashov, Oleg V., and Smetanina, Ksenia E.

Subjects
YTTERBIUM, MICROSTRUCTURE, X-ray diffraction, SCANNING electron microscopy, WAVELENGTHS
Abstract

Transparent ceramics based on ytterbium oxide have been successfully produced by vacuum sintering of self-propagating high-temperature synthesized powders with use of a La2O3 sintering aid. Phase composition and microstructure of the initial powders were studied by X-ray diffraction analysis and scanning electron microscopy. It was found that addition of 5 mol.% of La2O3 does not cause formation of secondary phases in the Yb2O3 powders. The 4% La:Yb2O3 ceramics showed the best in-line transmittance of 73% at a wavelength of 2 µm among the studied samples. Dependence of the Verdet constant on wavelength was investigated in the range of 0.4-2 µm. The most promising finding is use of the obtained material as Faraday isolators in the wavelength region of ~1.5 µm, where there are no absorption bands, and the Verdet constant is 8.6 rad/(T*m). [ABSTRACT FROM AUTHOR]

Published
2020
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12. Fabrication and performance evaluation of novel transparent ceramics RE:Tb3Ga5O12(RE = Pr, Tm, Dy) toward magneto-optical application

Author

Li, Xiaoying, Snetkov, Ilya L., Yakovlev, Aleksey, Liu, Qiang, Liu, Xin, Liu, Ziyu, Chen, Penghui, Zhu, Danyang, Wu, Lexiang, Yang, Zhaoxiang, Xie, Tengfei, Chen, Haohong, Palashov, Oleg, and Li, Jiang

Abstract

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.

Published
2021
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13. Characterizations of REE:Tb2O3 Magneto‐Optical Ceramics.

Author

Balabanov, Stanislav S., Permin, Dmitry A., Rostokina, Elena Ye., Palashov, Oleg V., and Snetkov, Ilya L.

Subjects
SELF-propagating high-temperature synthesis, TERBIUM, OXIDE ceramics, CERAMICS, RARE earth metals, ABSOLUTE value, OPTICAL elements
Abstract

The magneto‐optical ceramics of terbium oxide doped with different rare earth elements (REE) REE:Tb2O3 (REE—Y3+, Lu3+, Sc3+, Ce3+, Dy3+, Ho3+, Yb3+, Nd3+) are successfully fabricated by hot pressing using powders obtained by the self‐propagating high‐temperature synthesis (SHS) method. The prepared REE:Tb2O3 ceramics have good optical quality and magneto‐optical properties. The in‐line transmittance of Tb2O3 ceramics doped with REE except Sc3+ is close to undoped terbium oxide, especially in the long‐wavelength region. The Verdet constant of the REE:Tb2O3 samples considered at 633 nm is about 3.3 and 2.6 times higher in absolute value than that of the commercial terbium–gallium garnet (TGG) single crystal and terbium–aluminum garnet (TAG) ceramics, respectively. It is noted that REE (except Yb3+ and Nd3+) doping only slightly increases the Verdet constant of pure Tb2O3 (when the content of terbium ions in the optical element is taken into consideration in the calculation). The dilution of the Tb2O3 matrix with REE in relatively high concentrations leads to a decrease in the absolute value of the Verdet constant. [ABSTRACT FROM AUTHOR]

Published
2020
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