Research Progress on Magneto-optical Transparent Ceramics

doi:10.15541/jim20170160

Abstract

Abstract:

Magneto-optical material is a kind of optical functional material which has the magneto-optical effect from ultraviolet to infrared band. According to the type of material, magneto-optical materials can be classified into magneto-optical glass, magneto-optical crystals, magneto-optical transparent ceramics, etc. As a new type of magneto- optical material which has emerged in recent years, magneto-optical transparent ceramics are considered as one of the most promising candidates for Faraday isolators used in high power lasers due to its high Verdet constant, large size, high thermal conductivity, and high laser-induced-damage threshold. Up to now, the magneto-optical transparent ceramics reported mainly include terbium gallium garnet (Tb₃Ga₅O₁₂, TGG), terbium aluminum garnet (Tb₃Al₅O₁₂, TAG) and some sesquioxide ceramics such as terbium oxide (Tb₂O₃), holmium oxide (Ho₂O₃), dysprosium oxide (Dy₂O₃), etc. In this paper, several common magneto-optical effects were briefly introduced, and the basic principles of Faraday effect and Kerr effect were illustrated in detail. In addition, the research progress, all-sides properties and application prospects of magneto-optical transparent ceramics were mainly reviewed. The properties of different kinds of magneto-optical transparent ceramics were compared and analyzed, and the existing problems as well as the research prospects were also proposed.

Key words: magneto-optical transparent ceramics, Faraday isolator, research progress, prospect, review

CLC Number:

TQ174

LI Jiang, DAI Jia-Wei, PAN Yu-Bai. Research Progress on Magneto-optical Transparent Ceramics[J]. Journal of Inorganic Materials, 2018, 33(1): 1-8.

Figures/Tables 13

Fig. 1 Diagram of Faraday effect

Fig. 2 Diagram of Kerr effect

Fig. 3 Temperature dependence of Verdet constant of TGG single crystal and TGG ceramics[33]

Fig. 4 Transmission spectra of single crystal TGG and ceramic TGG samples[1]

Table 1 Optical scattering of ceramic and single crystal TGG samples[1]

Laser wavelength /nm	F.S.surface reflectivity	Crystal TGG 18 mm	Ceramic TGG 20 mm	Scattering ratio (Ceramic/Crystal)
632	3.45×10^-2	1.4×10^-3(1×10^-3 cm^-1)	4.8×10^-3(2.4×10^-3 cm^-1)	2.4
1064	3.36×10^-2	1×10^-3(5×10^-4 cm^-1)	1×10^-3(5×10^-4 cm^-1)	1.0

Fig. 5 Experimental results of depolarization as a function of laser power Red and blue circles denote results for the TGG ceramic with and without a magnet field. Open squares denote the calculated result for the TGG[39]

Fig. 6 Time dependence of depolarization (blue squares) and Faraday rotation angle (red circles)[39]

Fig. 7 Optical transmittance of the mirror polished transparent ceramics sintered at different temperatures[41]^T1-1550℃; T2-1600℃; T3-1650℃; T4-1700℃

Fig. 8 Power dependence of depolarization for TGG(×), TAG(◆), Ce:TAG(▲) [49]

Fig. 9 Optical power of thermal lens versus rudiation power for TGG(×), TAG(◆), Ce:TAG(▲) [49]

Table 2 Ceramic-based FI characteristics[48]

Medium	Isolation ratio @laser power	Thermal lens @laser power	Water cooling
TGG crystal	30 dB@650 W	6.5 m@340 W	Optional
TGG ceramics	30 dB@340 W	6.5 m@340 W	Optional
TAG ceramics	38 dB@300 W	8 m@300 W	Necessary
Ce:TAG ceramics (0.1at%)	31 dB@300 W	3.8 m@300 W	Necessary

Fig. 10 (a) Photograph and (b) transmission spectra of Tb3+:Y2O3 ceramics[55]

Fig. 11 (a) Wavelength dependence of Verdet constant of Tb3+:Y2O3 for 10%, 20%, and 30% concentrations of Tb3+ ions, Tb2O3 ceramics, and TGG single crystal; (b) VTb2O3/VTGG ratio versus wavelength[55]

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