High-refractive high-rare-earth-doped magneto-optical glass, preparation method and application thereof

Abstract

The application belongs to the technical field of magneto-optical glass materials, and particularly relates to high-refraction high-rare-earth-doped magneto-optical glass as well as a preparation method and application thereof. The composition of the high-refraction high-rare-earth-doped magneto-optical glass comprises: 30-62mol% of Tb2O3, 0-45mol% of B2O3, 0-30mol% of Al2O3, 0-25mol% of SiO2, 0-40mol% of Ga2O3, 0-5mol% of Ce2O3 (not 0), 0-5mol% of Sb2O3, and the sum of the mole percentages of the components is 100mol%.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of magneto-optical glass materials, and particularly relates to a high-refraction high-rare-earth-doped magneto-optical glass as well as a preparation method and application thereof. BACKGROUND

[0002] Magneto-optical materials based on the Faraday effect principle are the core materials of Faraday isolators used in laser systems and optical information processing technology. Garnet-type rare earth ferrite crystals such as YIG have high transmittance in the infrared region and large Faraday effect, and are used in the infrared range. However, the transparency of these ferrite crystals in the visible light region is low. With the rapid development of optical communication technology, the demand for optical fibers with shorter wavelengths is rapidly increasing. Therefore, it is necessary to explore new magneto-optical materials with high transparency and large Faraday effect characteristics in the visible to near-infrared range.

[0003] The Verdet constant (V B ) is one of the important parameters of the magneto-optical properties of Faraday materials, and the higher the value, the stronger the deflection ability of the magneto-optical material. Magneto-optical materials mainly include three types: magneto-optical crystals, magneto-optical ceramics, and magneto-optical glasses. Magneto-optical ceramics are limited in their applications due to poor optical performance; the growth process of magneto-optical crystals requires high process control, has limited size, and has high growth cost. Currently, terbium gallium garnet (TGG) crystals are highly transparent in the visible light range, and have a Verdet constant of -134 rad / T·m at 633 nm, which has been commercially applied. However, the V B value is not very high. Compared with magneto-optical ceramics and magneto-optical crystals, glassy materials are easy to process and shape.

[0004] Magneto-optical glasses are divided into inverse magnetic magneto-optical glasses and paramagnetic magneto-optical glasses. The magneto-optical sensitivity and Verdet constant of paramagnetic magneto-optical glasses are relatively high, so how to obtain magneto-optical glasses with strong magneto-optical effect has become a research hotspot. Tb 3+ ions are the most widely doped rare earth ions in the preparation of paramagnetic Faraday glasses, and the current substrate glass is mainly borosilicate aluminate or aluminosilicate glass. In order to achieve a large Faraday effect, the key is to dope a large amount of Tb 3+ in the glass matrix. In the currently reported magneto-optical glass systems prepared by high-temperature melting method, the amount of rare earth doping is limited (Tb2O3<45 mol%), and the comprehensive performance of the glass is reduced when the concentration of Tb 3+ ions is high. The currently reported preparation of high-content Tb element doping still needs to be subjected to secondary heat treatment to prepare magneto-optical glasses with high transmittance in the visible light range. In summary, it is a technical problem to be solved to prepare high-quality magneto-optical glasses with a large V B value and high transmittance at the wavelength of interest. SUMMARY

[0005] In view of the deficiencies of the prior art, the application provides a high-refraction high-rare earth doping magneto-optical glass, a preparation method and application thereof, effectively solving the problems of poor stability, poor mechanical processing performance, large dispersion and low rare earth doping amount of the traditional glass system. The preparation method is novel, has the characteristics of short preparation period, simple process, no subsequent forming processing, suitable for large-scale production and the like, and the prepared magneto-optical glass has high Verdet constant and excellent optical and thermal properties, which lays a foundation for the practical application of the magneto-optical glass in the field of optical isolators and the like.

[0006] In one aspect, the application provides a high-refraction high-rare earth doping magneto-optical glass, the composition of the magneto-optical glass comprising: 30-62 mol% of Tb2O3; 0-45 mol% of B2O3; 0-30 mol% of Al2O3; 0-25 mol% of SiO2; 0-40 mol% of Ga2O3; 0-5 mol% of Ce2O3 and not 0; 0-5 mol% of Sb2O3; and the sum of the molar percentages of the components being 100 mol%.

[0007] In the application, Tb2O3, Ce2O3 and Dy2O3 generate large Verdet constant, among the rare earth ions, Tb 3+ has high paramagnetic susceptibility and large magnetic moment, and is an ideal material doped into the glass system. However, high Tb2O3 (introduced from Tb4O7) is doped into the glass system, and there are more Tb 4+ in the system. The existence of Tb 4+ has wide absorption in the wavelength range of 300-1100 nm, resulting in a significant reduction in the transmittance of the glass in the visible light region (e.g. at 633 nm). After co-doping of Tb and Ce, on the one hand, the existence of Ce 3+ can reduce more Tb 4+ to Tb 3+ , and on the other hand, Ce 3+ is oxidized to Ce 4+ , and Ce 4+ has less absorption in the visible-near infrared region, so that the co-doping of Tb and Ce rare earth ions can significantly improve the visible light transmittance. At the same time, the co-doping of Tb and Ce rare earth ions has little effect on the Verdet constant of the magneto-optical glass, such as. Furthermore, the selection of the glass matrix with stability is also crucial to the magneto-optical effect, and the addition of boron-silicon components to the glass system can significantly improve the crystallization resistance of the system and make a large number of rare earth ions uniformly dispersed in the system. Al2O3 can improve the glass stability by changing the viscosity. Ga2O3 has the characteristics of low phonon energy and high thermal stability, and is also a good material for infrared application. Therefore, the paramagnetic magneto-optical glass of the application not only has the characteristics of high thermal stability, high refraction, high transmittance and high rare earth doping, but also has excellent magneto-optical effect.

[0008] In addition, Sb2O3 can be used as a fining agent and a reducing agent, and can make the glass clear when added in an appropriate amount. However, when the content of Sb2O3 is too high, the glass is prone to crystallization. Therefore, the content of Sb2O3 is preferably 0-5 mol%, particularly 0-3 mol%, and especially 0-1.5 mol%.

[0009] Preferably, the magneto-optical glass comprises: 45-60 mol% Tb2O3; 22-45 mol% B2O3; 0-30 mol% Al2O3; 0-20 mol% SiO2; 5-30 mol% Ga2O3; 0.1-2.5 mol% Ce2O3; and the sum of the molar percentages of the components is 100 mol%.

[0010] Preferably, the magneto-optical glass is paramagnetic magneto-optical glass; wherein the Ce element is Ce 3+ and Ce 4+ coexist. It should be noted that, in the present application, the Ce element is recorded as Ce2O3, but in the actual glass, the Ce element is Ce 3+ and Ce 4+ coexist.

[0011] Preferably, the magneto-optical glass has a refractive index n d of 1.84-1.95, and an Abbe number of not less than 40; and a Verdet constant of -50 to -90 rad / T·m at 1064 nm at room temperature.

[0012] Preferably, the magneto-optical glass has a glass transition temperature of >750°C.

[0013] Preferably, the magneto-optical glass has a transmittance of >60% (preferably 60%-80%) at 633 nm; a transmittance of 66-80% at 1064 nm; and a transmittance of 70-82% at most in the near-infrared region (800-1570 nm).

[0014] On the other hand, the present application provides a preparation method of a high-refractive high-rare-earth-doped magneto-optical glass, comprising:

[0015] (1) weighing Tb4O7, H3BO3, Al2O3, SiO2, Ga2O3, CeO2 or Dy2O3 according to the composition of the high-refractive high-rare-earth-doped magneto-optical glass, and mixing to obtain a raw material powder;

[0016] (2) pre-sintering the raw material powder to obtain a pre-sintered powder;

[0017] (3) placing the obtained pre-sintered powder in a mold to perform tabletting, and then performing secondary sintering to obtain a sintered block;

[0018] (4) Laser melting the obtained sintered block in an air suspension furnace to form a homogeneous melt, and obtaining the high-refractive and highly rare-earth-doped magneto-optical glass after solidification.

[0019] In the present invention, after co-doping of terbium and cerium, on the one hand, Ce 3+ The presence of more Tb 4+ Restore to Tb 3+ , in addition Ce 3+ Oxidized to Ce 4+ , Ce 4+ There is less absorption in the visible-near-infrared region, so the co-doping of terbium and cerium rare earth ions can achieve a significant improvement in visible light transmittance. Ultimately, magneto-optical glass with high visible light transmittance can be prepared without the need for heat treatment (such as nitrogen atmosphere or N2 / H2 reducing atmosphere).

[0020] Preferably, the pre-sintering temperature is 500-800° C., and the time is 1-12 hours; and the tableting pressure is 5-15 MPa.

[0021] Preferably, the secondary sintering temperature is 800-1250°C and the time is 3-12 hours;

[0022] The laser melting parameters include: the atmosphere is nitrogen atmosphere, the purity of the nitrogen atmosphere is ≥99.99%, the pressure of the nitrogen atmosphere is 3-8 MPa; and the laser power is 30-100W.

[0023] On the other hand, the present invention provides an application of high-refractive and highly rare-earth-doped magneto-optical glass in the fields of laser and optical fiber communication, wherein the high-refractive and highly rare-earth-doped magneto-optical glass serves as a main component of an optical isolator.

[0024] Beneficial effects of the present invention:

[0025] The preparation method of the present invention has the characteristics of novelty, simple operation process, low cost and favorable large-scale production. It can avoid contamination from the crucible, inhibit heterogeneous nucleation, obtain deep supercooling, and realize rapid solidification. It is an effective technology for preparing high-purity, low-impurity, uniform composition, dense structure, and glass materials that are difficult to prepare under conventional conditions.

[0026] The high-refractive, highly rare-earth-doped magneto-optical glass obtained by the present invention not only has a high refractive index and high transmittance in the near-infrared region, but also exhibits excellent thermal stability and magneto-optical properties. Without requiring secondary heat treatment in a nitrogen atmosphere or a reducing atmosphere (nitrogen and hydrogen), a glass material with both high rare earth ion content and high transmittance in the visible-near-infrared region can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1A photograph of the magneto-optical glass prepared for Example 1, Example 2 and Example 3;

[0028] Figure 2 A curve of the refractive index of the magneto-optical glass prepared for Example 2 versus the incident wavelength;

[0029] Figure 3 A curve of the transmittance of the magneto-optical glass prepared for Example 1, Comparative Example 1 and Comparative Example 2 versus the incident wavelength;

[0030] Figure 4 A transmittance spectrum of the magneto-optical glass prepared for Example 2. DETAILED DESCRIPTION

[0031] The present application is further illustrated by the following examples, which should not be construed as limiting the present application.

[0032] In the present application, the magneto-optical glass has B2O3, SiO2, Al2O3, Ga2O3 as the base components, and is doped with rare earth, and is singly doped with terbium oxide or co-doped with terbium and cerium. The magneto-optical glass contains Tb2O3 at 30-62 mol% (for example, 30 mol%, 40 mol%, 45 mol%, 50 mol%, 55 mol%, 62 mol%, etc.), Al2O3 at 0-30 mol% (for example, 0 mol%, 5 mol%, 10 mol%, 15 mol%, 20 mol%, 25 mol%, 30 mol%, etc.), Ga2O3 at 0-40 mol% (for example, 0 mol%, 5 mol%, 10 mol%, 15 mol%, 20 mol%, 30 mol%, etc.), B2O3 at 0-45 mol% (for example, 0 mol%, 5 mol%, 10 mol%, 15 mol%, 20 mol%, 25 mol%, 30 mol%, 35 mol%, 40 mol%, 45 mol%, etc.), SiO2 at 0-25 mol% (for example, 0 mol%, 5 mol%, 10 mol%, 15 mol%, 20 mol%, 25 mol%, etc.), Ce2O3 at 0-5 mol% (for example, 0.1 mol%, 0.25 mol%, 0.85 mol%, 1.5 mol%, 2.0 mol%, 2.5 mol%, 4.0 mol%, etc.), and Sb2O3 at 0-5 mol% (for example, 0 mol%, 0.35 mol%, 0.85 mol%, 1.5 mol%, etc.). In the above composition, the borosilicate oxide can improve the anti-crystallization ability of the system, expand the forming region of the glass, and make a large amount of rare earth ions uniformly dispersed in the system. Al2O3 can improve the glass stability by changing the viscosity. Ga2O3 has the characteristics of low phonon energy and high thermal stability. Sb2O3 is a fining agent. Among the trivalent ions, Dy3+ , Tb 3+ 、Ce 3+ Can produce a large Verdet constant.

[0033] In the present invention, raw materials (powders) corresponding to the magneto-optical glass materials are mixed, the mixed powder is pre-sintered, pressed into shape, and sintered to obtain a sintered product. The sintered product is melted and solidified using a containerless air suspension technique to obtain paramagnetic magneto-optical glass. The following exemplifies the preparation method of high-refractive, highly rare-earth-doped magneto-optical glass (also known as high-refractive, high-transmittance terbium-cerium co-doped magneto-optical glass).

[0034] B2O3, SiO2, Al2O3, and Ga2O3 are used as matrix components, and rare earth doping is co-doping with terbium and cerium. They are weighed and mixed according to a certain molar percentage to obtain a raw material powder (or mixed powder). For example, alcohol is used for uniform mixing.

[0035] The mixed powder is pre-sintered to obtain a pre-fired powder. The mixed material is pre-sintered to remove moisture and some impurities. For example, the pre-sintering temperature is 500-800°C and the temperature is maintained for 1-12 hours.

[0036] The pre-sintered powder is pressed into a shape and then subjected to secondary sintering to obtain a sintered product (or sintered block). The sintered powder is pressed into a cylindrical shape in a tablet press at a pressure of 5 to 15 MPa, and the sintering temperature is set at 800 to 1250°C in a high-temperature furnace for 3 to 12 hours.

[0037] The sintered product is melted and solidified using air suspension containerless technology to obtain paramagnetic magneto-optical glass. Specifically, the sintered preform is laser melted using air suspension containerless technology. The airflow is pure nitrogen and the pressure is 3-8MPa. The airflow and laser power are adjusted to stabilize the sample in suspension. The laser is then quickly turned off to obtain ellipsoidal or spherical paramagnetic magneto-optical glass. During the melting and solidification process using air suspension containerless technology, the atmosphere is nitrogen. The sintered block is placed in an alumina nozzle. The sample can be melted by adjusting the laser power and airflow. After stable suspension, the laser is turned off. After repeated operations, ellipsoidal or spherical rare earth-doped paramagnetic magneto-optical glass can be produced.

[0038] In the above-mentioned process of preparing magneto-optical glass using the air suspension containerless technology, the sample is suspended on the container, which avoids contamination of the sample by contact with the container, inhibits heterogeneous nucleation, and enables the melt to be deeply supercooled and achieve rapid solidification, thereby obtaining a high-purity, low-impurity, and densely structured glass material.

[0039] In summary, the preparation of paramagnetic magneto-optical glass by gas suspension containerless technology is innovative and feasible. The high-refractive high-rare earth-doped magneto-optical glass obtained by the above preparation method not only has high refractive index and Abbe number, high transmittance in the near-infrared region, but also has good thermal stability and magneto-optical performance, and has potential application prospects in the fields of optical isolators and optical fiber sensors.

[0040] The magneto-optical glass obtained above is double polished, with a thickness of about 1.5 mm, and a series of optical and magneto-optical performance tests are carried out.

[0041] Refractive index test: The refractive index of the glass was measured and fitted by a spectroscopic ellipsometer (J.A. Woollam M-2000).

[0042] Transmittance spectrum test: The transmittance of the glass was tested by an ultraviolet spectrophotometer.

[0043] Thermal performance test: The thermal performance of the glass was analyzed by a STA8000 synchronous thermal analyzer, and three characteristic temperatures of the glass were obtained.

[0044] Verdet constant test: At room temperature, the Verdet constant of the glass was tested by a Faraday effect tester.

[0045] The following examples are further illustrated to explain the present application. It should also be understood that the following examples are only used to further illustrate the present application, and cannot be understood as limiting the scope of protection of the present application. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present application are within the scope of protection of the present application. The specific process parameters in the following examples are only one example in the appropriate range, i.e. those skilled in the art can select within the appropriate range according to the description herein, and are not limited to the specific values in the following examples.

[0046] Example 1

[0047] According to the set batching, the corresponding oxides Tb2O3 (49.5 mol%), Ce2O3 (0.5 mol%), Al2O3 (5 mol%), Ga2O3 (5 mol%), B2O3 (25 mol%) and SiO2 (15 mol%) were weighed, mixed in a mortar, wet ground with alcohol, and then the mixed powder was pre-sintered at 550°C for 5h, cooled to furnace cooling, then pressed into a cylindrical shape under a pressure of about 10MPa, and then sintered at 1100°C for 10h. About 100-260mg of raw materials were placed in the nozzle, and the glass was solidified by gas suspension furnace, with nitrogen as the atmosphere. After the sample was completely melted and uniform, the laser was turned off, and an ellipsoidal or spherical glass with a diameter of about 3-5mm was obtained. The Verdet constant of the material at 1064nm was -71.88 rad / T·m.

[0048] Comparative Example 1

[0049] According to the set formulation, the corresponding oxides Tb2O3 (50 mol%), Al2O3 (5 mol%), Ga2O3 (5 mol%), B2O3 (25 mol%) and SiO2 (15 mol%) are weighed, mixed in a mortar, wet-ground with alcohol, and then pre-sintered at 550°C for 5 hours, cooled with the furnace, and then pressed into a cylindrical shape at a pressure of about 10 MPa, and then sintered at 1100°C for 10 hours. Take about 100-260 mg of raw materials and place them in a nozzle. Use an air suspension furnace to solidify it in a nitrogen atmosphere. After the sample is completely melted and uniform, turn off the laser to obtain an ellipsoidal or spherical glass with a diameter of about 3-5 mm. The refractive index n of the material is tested. d The optical transmittance is 1.890 and the Abbe number is 52. The transmittance in the visible and near-infrared bands is as high as 77.2% (1367nm).

[0050] Comparative Example 2

[0051] According to the set formulation, the corresponding oxides Tb2O3 (49.5 mol%), Dy2O3 (0.5 mol%), Al2O3 (5 mol%), Ga2O3 (5 mol%), B2O3 (25 mol%), and SiO2 (15 mol%) were weighed and mixed in a mortar. The mixture was wet-ground with alcohol, and then pre-sintered at 550°C for 5 hours. The mixture was then cooled with the furnace, pressed into a cylindrical shape at a pressure of approximately 10 MPa, and sintered at 1100°C for 10 hours. Approximately 100-260 mg of the raw material was placed in a nozzle and solidified in an air suspension furnace with a nitrogen atmosphere. Once the sample was completely melted and homogenized, the laser was turned off to produce ellipsoidal or spherical glass with a diameter of approximately 3-5 mm. The glass transition temperature of the material was tested to be 825.6°C.

[0052] Figure 1 The physical pictures of the magneto-optical glass prepared in Example 1, Example 2 and Example 3 are shown in FIG. Figure 1 The appearance and morphology of each sample can be seen, as well as the uniform and transparent characteristics.

[0053] Figure 2 The curve of the refractive index of the magneto-optical glass prepared in Example 2 as a function of the incident wavelength is shown in FIG. Figure 2 In the figure, we can see the refractive index of glass materials at different incident wavelengths. In optical research, the refractive index n at the helium yellow line (587.56nm) is generally used. d The value characterizes the refractive properties of the glass, according to Figure 2 As a result, the refractive index of the glass n dThe value is 1.910, and the Abbe number is 42.45. It can be seen that the transmittance in the near-infrared band is as high as 75.14% (845 nm), and the transmittance at 1064 nm is 73.72%.

[0054] Figure 3 The transmittance of the magneto-optical glass prepared in Example 1, Comparative Example 1 and Comparative Example 2 varies with the change of the incident wavelength. As can be seen from the figure, only after co-doping with terbium and cerium, the transmittance interval is widened compared with the sample doped with terbium alone, and after co-doping with terbium and dysprosium, the transmittance of the sample is overall decreased compared with the sample doped with terbium alone. The transmittance of the sample co-doped with terbium and cerium obtained by the present application is 74.25% at 633 nm.

[0055] Example 2

[0056] According to the set formula 50Tb2O3-0.25Ce2O3-9.75Ga2O3-36B2O3-4SiO2, the corresponding oxides are weighed, mixed in a mortar, wet ground with alcohol, and then the mixed powder is pre-sintered at 550°C for 5h, cooled to furnace cooling, then pressed into a cylindrical shape under a pressure of about 10MPa, and then sintered at 1100°C for 10h. About 100-260mg of raw materials are placed in the nozzle, and the sample is solidified by using a gas suspension furnace, the atmosphere is nitrogen, after the sample is completely melted and uniform, the laser is turned off, and an ellipsoidal or spherical glass with a diameter of about 3-5mm is obtained. It is detected that the refractive index n of the material is 1.910, and the Abbe number is 42.45. It can be seen that the transmittance in the near-infrared band is as high as 75.14% (845 nm), and the transmittance at 1064 nm is 73.72%. d The value is 1.910, and the Abbe number is 42.45. It can be seen that the transmittance in the near-infrared band is as high as 75.14% (845 nm), and the transmittance at 1064 nm is 73.72%.

[0057] Example 3

[0058] According to the set formula 50Tb2O3-0.25Ce2O3-9.75Ga2O3-36B2O3-4SiO2, the corresponding oxides are weighed, mixed in a mortar, wet ground with alcohol, and then the mixed powder is pre-sintered at 550°C for 5h, cooled to furnace cooling, then pressed into a cylindrical shape under a pressure of about 10MPa, and then sintered at 1100°C for 10h. About 100-260mg of raw materials are placed in the nozzle, and the sample is solidified by using a gas suspension furnace, the atmosphere is nitrogen, after the sample is completely melted and uniform, the laser is turned off, and an ellipsoidal or spherical glass with a diameter of about 3-5mm is obtained. It is detected that the refractive index n of the material is 1.910, and the Abbe number is 42.45. It can be seen that the transmittance in the near-infrared band is as high as 75.14% (845 nm), and the transmittance at 1064 nm is 73.72%.

[0059] Figure 4 The transmittance of the magneto-optical glass prepared in Example 2 varies with the change of the incident wavelength. As can be seen from the figure, after co-doping with terbium and cerium, the transmittance interval is widened compared with the sample doped with terbium alone. The transmittance of the sample co-doped with terbium and cerium obtained by the present application is 72.03% at 633 nm.

[0060] Table 1:

[0061] Tb2O 3 / mol%]]> <![CDATA[Ce2O3 / mol%]]> <![CDATA[Ga2O3 / mol%]]> Al2O3 / mol% B2O3 / mol % SiO2 / mol % Example 1 49.5 0.5 5 5 25 15 Comparative Example 1 50 0 5 5 25 15 Comparative Example 2 49.5 Dy203 / 0.5 5 5 25 15 Example 2 50 0.25 9.75 0 36 4 Example 3 53.75 0.25 7 0 39 0 .

[0062] Table 2:

[0063]

[0064] The paramagnetic magneto-optical glass prepared in the embodiment has high rare earth content, high Abbe number, high transmittance in the visible and near-infrared regions, excellent optical properties, high glass transition temperature, and large Verdet constant, and is expected to be applied as an optical isolator.

Claims

1. A high-refractive, highly rare-earth-doped magneto-optical glass, characterized in that: The magneto-optical glass comprises: 45-60 mol% Tb2O3; 22-45 mol% B2O3; 0-30 mol% Al2O3; 0-20 mol% SiO2; 5-30 mol% Ga2O3; 0.1-2.5 mol% Ce2O3; the sum of the molar percentages of the components is 100 mol%. The magneto-optical glass is a paramagnetic magneto-optical glass; wherein the Ce element is Ce 3+ and Ce 4+ coexist.

2. The high-refractive and highly rare-earth-doped magneto-optical glass according to claim 1, characterized in that: The refractive index n of the magneto-optical glass d 1.84~1.95, Abbe number not less than 40; The magneto-optical glass has a Verdet constant of -50 to -90 rad / T·m at 1064 nm at room temperature.

3. The high-refractive and highly rare-earth-doped magneto-optical glass according to claim 1, characterized in that: The glass transition temperature of the magneto-optical glass is greater than 750°C.

4. The high-refractive and highly rare-earth-doped magneto-optical glass according to any one of claims 1 to 3, characterized in that: The transmittance of the magneto-optical glass at 633nm is above 60%; The transmittance of the magneto-optical glass at 1064 nm is 66-80%; The transmittance of the magneto-optical glass in the near-infrared region of 800-1570 nm is 70-82%.

5. A method for preparing the high-refractive and highly rare-earth-doped magneto-optical glass according to any one of claims 1 to 4, characterized in that: include: (1) Weighing Tb4O7, H3BO3, Al2O3, SiO2, Ga2O3, and CeO2 according to the composition of the high-refractive and highly rare-earth-doped magneto-optical glass and mixing them to obtain a raw material powder; (2) Pre-sintering the raw material powder to obtain pre-sintered powder; (3) The obtained pre-burned powder is placed in a mold for tableting, and then subjected to secondary sintering to obtain a sintered block; (4) The obtained sintered block is subjected to laser melting in an air suspension furnace to form a homogeneous melt, and the high-refractive and highly rare-earth-doped magneto-optical glass is obtained after solidification.

6. The preparation method according to claim 5, wherein The pre-sintering temperature is 500-800° C., and the time is 1-12 hours; the tableting pressure is 5-15 MPa.

7. The preparation method according to claim 5 or 6, characterized in that: The secondary sintering temperature is 800-1250°C and the time is 3-12 hours; The laser melting parameters include: the atmosphere is a nitrogen atmosphere, the purity of the nitrogen atmosphere is ≥99.99%, the pressure of the nitrogen atmosphere is 3-8 MPa; and the laser power is 30-100W.

8. Use of the high-refractive, highly rare-earth-doped magneto-optical glass according to any one of claims 1 to 4 in the fields of lasers and optical fiber communications, characterized in that: The high-refractive and highly rare-earth-doped magneto-optical glass serves as a main component of an optical isolator.

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