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Scandium doped terbium aluminum garnet magneto-optical crystal and preparation method thereof

A magneto-optic crystal and garnet technology, which is applied in the field of scandium-doped terbium aluminum garnet magneto-optic crystal and its preparation, can solve the problems of crystal cracking and unusability, achieve short cycle time, good thermal performance, and realize large-scale low-cost The effect of mass production

Inactive Publication Date: 2018-02-16
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the axial temperature gradient near the growth interface is too low (3 It cannot be used due to impurity, and too large a temperature gradient can easily lead to crystal cracking

Method used

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  • Scandium doped terbium aluminum garnet magneto-optical crystal and preparation method thereof
  • Scandium doped terbium aluminum garnet magneto-optical crystal and preparation method thereof
  • Scandium doped terbium aluminum garnet magneto-optical crystal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Growth of Tb by Guided Mode Pulling 3 sc 1.0 Al 4.0 o 12 crystals.

[0029] 1) Press Tb 3 sc 1.0 Al 4.0 o 12 The stoichiometric ratio accurately weighs Tb 4 o 7 (99.99%), Sc 2 o 3 (99.999%), Al 2 o 3 (99.99%) The raw materials are put into a corundum mortar, mixed and ground evenly. After being pressed into tablets, they are placed in a muffle furnace for high-temperature sintering to prepare high-purity polycrystalline raw materials; for 17 hours.

[0030] 2) The size is about φ60×40 mm 3 The iridium gold crucible is used as the container for crystal growth, and the iridium gold module with holes is the guided mode module. The synthesized polycrystalline powder raw materials were put into the iridium crucible of the single crystal pulling furnace, and the single crystal guided mode pulling growth was carried out under the Ar atmosphere. The growth temperature was 1900°C, and the axial temperature gradient near the growth interface was 27±3°C / cm, the gr...

Embodiment 2

[0033] Growth of Tb by pulling method 3 sc 1.3 Al 3.7 o 12 crystals.

[0034] 1) Press Tb 3 sc 1.3 Al 3.7 o 12 The stoichiometric ratio accurately weighs Tb 4 o 7 (99.99%), Sc 2 o 3 (99.999%), Al 2 o 3 (99.99%) raw materials, the raw materials are put into a corundum mortar, mixed and ground evenly, after being pressed into tablets, placed in a muffle furnace for high-temperature sintering for 15 hours to prepare high-purity polycrystalline raw materials; the high-temperature sintered The temperature is 1500°C;

[0035] 2) The size is about φ60×40 mm 3 The iridium crucible is used as the container for crystal growth. Put the synthesized polycrystalline powder raw materials into the iridium crucible of the single crystal pulling furnace, and carry out single crystal growth under Ar atmosphere. The growth temperature is 1870 ° C, near the growth interface. The axial temperature gradient of the crystal is 20±3°C / cm, the growth rate is about 2.0 mm / h, and the cryst...

Embodiment 3

[0038] Tb 3 sc 1.5 Al 3.5 o 12 The preparation of crystal comprises the following steps:

[0039] 1) Press Tb 3 sc 1.5 Al 3.5 o 12 The stoichiometric ratio accurately weighs Tb 4 o 7 (99.99%), Sc 2 o 3 (99.999%), Al 2 o 3 (99.99%) raw materials, the raw materials are put into the corundum mortar and mixed, ground evenly, after being pressed into tablets, placed in the muffle furnace and carried out high-temperature sintering for 15 hours to prepare high-purity polycrystalline raw materials; the temperature of high-temperature sintering is 1400°C.

[0040] 2) The size is about φ60×40 mm 3 The iridium crucible is used as the container for crystal growth, put the synthesized polycrystalline powder raw material into the iridium crucible of the single crystal pulling furnace, and carry out single crystal growth under Ar atmosphere, the growth temperature is 1850 ℃, near the growth interface The axial temperature gradient is 13±3°C / cm, the growth rate is about 1.0 mm...

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Abstract

The invention provides a scandium doped terbium aluminum garnet magneto-optical crystal and a preparation method thereof. The crystal has a chemical formula of Tb3ScxAl5-xO12 (x=1.0-1.5), belongs to cubic system, and has a space group shown as the specification. Crystals can employ czochralski method or guided mode czochralski method with high axial temperature gradient at a near growth interfacefor growth, and the method has the characteristics of strong operability, simple process and short cycle, and can achieve large-scale and low-cost batch production of large size single crystals. The prepared crystal has the advantages of large size, good optical homogeneity, excellent physical and chemical properties, large Verdet constant and high permeation performance in visible-near infrared regions. The crystal has strong magneto-optical effect in visible-near infrared regions, and the Verdet constant is about 20-30% higher than commercial TGG crystals. Orientation, cutting, rough grinding, polishing and film coating can be carried out on the crystal according to requirements to obtain various magneto-optical devices, the crystal can be widely applied in various magneto-optical fields, and has significant economic and social benefits.

Description

technical field [0001] The invention belongs to the field of artificial crystals and crystal growth in the technical field of optoelectronic functional materials, and specifically relates to a scandium-doped terbium aluminum garnet magneto-optical crystal and a preparation method thereof. Background technique [0002] In optical communication and precision optical measurement technology, in order to ensure the frequency stability of the light source and avoid the influence of reflected light, a non-reciprocal optical control device-optical isolator must be used. At the heart of these devices is a rare-earth garnet-type crystal that acts as a Faraday rotator. This kind of material has small optical absorption loss and large Faraday rotation in the visible and near-infrared bands, so its magneto-optical figure of merit can reach a high value. [0003] Commercial garnet-type Tb 3 Ga 5 o 12 (TGG) melt is a molten compound with the same composition, but the melt has a large w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/28C30B15/34C30B11/00
CPCC30B29/28C30B11/00C30B15/34
Inventor 庄乃锋陈新孟德强徐前瑞郭飞云胡晓琳
Owner FUZHOU UNIV
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