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...

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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 g...

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