Faraday magnetic rotation transparent ceramic and preparation method thereof

Abstract

The invention discloses faraday magnetic rotation transparent ceramic and a preparation method thereof. The structural formula of the transparent ceramic is shown as Tb3-xAxAl5-yByO12, wherein A is Tm, Lu, Y or Gd; B is Sc or Ga; x is more than or equal to 0 and less than or equal to 2.9; and y is more than or equal to 0 and less than or equal to 5. The preparation method comprises the following steps of: preparing raw materials according to the components of the transparent ceramic with the structural formula of Tb3-xAxAl5-yByO12; adding 0.3 to 0.7 weight percent of ethyl orthosilicate serving as an additive; performing ball-milling, drying and tableting on powder; pressing with cool isostatic pressure of over 200 Mpa to obtain a blank body; pre-sintering to remove organic components; and putting the blank body into a vacuum or hot-press sintering furnace for sintering to obtain the magnetic rotation transparent ceramic with the structural formula of Tb3-xAxAl5-yByO12. The ceramic has high optical transmittance and high Verdet constant in a visible-near infrared band. The preparation method has the advantages of simple preparation technology, low cost, nontoxic preparation process and the like.

Description

technical field [0001] The present invention relates to Faraday magnetic rotation optically transparent ceramic material, especially a kind of component is Tb 3-x A x Al 5-y B y o 12 (wherein, A is Tm, Lu, Y, Gd, etc., B is Sc, Ga, etc.; 0≤x≤2.9, 0≤y≤5) Faraday magnetic optically transparent ceramics and a preparation method thereof. Background technique [0002] The optical isolator based on Faraday magnetic rotation material is one of the necessary devices in the fields of optical communication and high-power laser processing. Its working principle is based on the phenomenon of Faraday magnetic rotation. Rotated by 90°, thus (via the polarizer) function to isolate the reverse light propagation. The physical parameter to measure the optical rotation ability of a material under the action of a unit strength magnetic field is the Verdet (abbreviated as V) constant, and its expression can be written as: [0003] V=θ / LH [0004] Among them, θ is the deflection angle of t...

AI Technical Summary

Problems solved by technology

[0006] (1) Terbium Gallium Garnet (Tb 3 Ga 5 o 12 , abbreviated as TGG) single crystal, the most commonly used magneto-optical material in the visible light and near-infrared bands, its disadvantages are firstly that Ga is very expensive, and the cost of crystal growth is high

Second, since Tb 3 Ga 5 o 12 Crystals tend to produce Ga during the pulling process 2 o 3 The volatilization of the crystal composition leads to the deviation of the crystal composition and the change of the melting point of the melt, so high-quality Tb 3 Ga 5 o 12 There are also certain technical difficulties in the growth of single crystals;

[0007] (2) Terbium glass, which has the advantage that the size can be made larger, but the disadvantage is that its Verdet constant is relatively small and the device volume is large. In addition, the thermal conductivity of glass is also worse than that of crystal materials;

[0008] (3) Yttrium iron garnet (Fe 3 Al 5 o 12 , abbreviated as YIG) film, which has high transparency in the range of 1.1-5.5 μm, but its transmittance in the visible-near infrared band is poor, so it is not suitable for use in the range of 400-1100nm

[0010] But Tb 3 Al 5 o 12 As a non-uniform melting compound, it is difficult to grow high-quality, large-size single crystals by the melt method

Images