A method for manufacturing a faraday rotator and a faraday rotator

Abstract

This invention discloses a method for manufacturing a Faraday rotatable sheet, comprising the following steps: (1) fabricating a calcium magnesium zirconium doped gadolinium gallium garnet single crystal; (2) using the calcium magnesium zirconium doped gadolinium gallium garnet single crystal as a substrate material, and growing a bismuth-substituted rare-earth iron garnet single crystal via liquid-phase epitaxy to form a composite material; (3) grinding and thinning the side of the composite material with the bismuth-substituted rare-earth iron garnet single crystal; (4) grinding and thinning the side of the composite material with the substrate material; (5) simultaneously grinding and thinning both sides of the composite material. Because both sides of the composite material are simultaneously ground and thinned, the forces on both sides are uniform and balanced. This avoids the composite material from bending or warping to one side, overcoming the curling effect. A flatter Faraday rotatable sheet with an effective aperture conforming to the standard is obtained, improving the performance of the Faraday rotatable sheet. This invention also discloses a Faraday rotatable sheet.

Description

Technical Field

[0001] This invention relates to a method for manufacturing a Faraday rotator and the Faraday rotator itself, belonging to the field of Faraday rotator processing technology. Background Technology

[0002] Fiber optic isolators are crucial optical devices in optical communication. Faraday rotators are essential components of fiber optic isolators. Currently, Faraday rotators are ground using a single-sided grinding machine. However, this method has the following problems and drawbacks: because the Faraday rotator is very thin, approximately 0.3 mm, controlling the processing precision is difficult. Furthermore, the thin Faraday rotator's edges exhibit a curling effect, which affects its performance and effective aperture. Therefore, overcoming the curling effect to manufacture flat Faraday rotators with standard effective apertures and improve their performance is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the present invention aims to provide a method for manufacturing a Faraday rotator plate.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a method for manufacturing a Faraday rotatable plate, comprising the following steps:

[0005] (1) Fabrication of calcium magnesium zirconium doped gadolinium gallium garnet single crystals;

[0006] (2) Using calcium magnesium zirconium doped gadolinium gallium garnet single crystal as substrate material, bismuth-substituted rare earth iron garnet single crystal is grown by liquid phase epitaxy to form a composite material;

[0007] (3) Grind and thin the side of the composite material with bismuth-substituted rare earth iron garnet single crystal;

[0008] (4) Grind and thin the side of the composite material with the substrate material;

[0009] (5) Simultaneous grinding and thinning of both sides of the composite material.

[0010] A further feature of the present invention is that the grinding speed of both sides of the composite material is the same.

[0011] A further provision of the present invention is that the composite material is thinned until the substrate material is removed.

[0012] The present invention is further configured such that: the thickness of the substrate material in step 2 is 550 μm, and the thickness of the bismuth-substituted rare earth iron garnet single crystal is 400 μm.

[0013] A further feature of this invention is that the composite material is simultaneously ground and thinned on both sides until the thickness of the bismuth-substituted rare earth iron garnet single crystal is 290um-296um.

[0014] The present invention also provides a Faraday rotator plate, characterized in that it is manufactured by the Faraday rotator plate manufacturing method according to any one of claims 1-5.

[0015] A further feature of the present invention is that the wavelength tail of the Faraday rotator is 1310 nm.

[0016] Compared with existing technologies, the beneficial effects of this invention are: because both sides of the composite material are simultaneously ground and thinned, the force on both sides is uniform and balanced. This prevents the composite material from bending or warping to one side, overcoming the curling effect. It results in a flatter Faraday rotatable sheet with an effective pore size conforming to standards, thus improving the performance of the Faraday rotatable sheet.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the composite material structure;

[0019] Figure 2 This is a schematic diagram of the structure of a composite material after grinding and thinning one side of a bismuth-substituted rare-earth iron garnet single crystal.

[0020] Figure 3 This is a schematic diagram of the structure of the composite material after grinding and thinning the side with the substrate material.

[0021] Figure 4 This is a schematic diagram of the structure after the composite material is simultaneously ground and thinned on both sides.

[0022] In the figure: 1. Calcium-magnesium-zirconium-doped gadolinium-gallium garnet single crystal; 2. Bismuth-substituted rare-earth iron garnet single crystal. Detailed Implementation

[0023] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0024] See appendix Figure 1-4As shown, in this embodiment, a method for manufacturing a Faraday rotatable sheet involves first fabricating a calcium magnesium zirconium doped gadolinium gallium garnet single crystal; then, using the calcium magnesium zirconium doped gadolinium gallium garnet single crystal as a substrate material, a bismuth-substituted rare-earth iron garnet single crystal is grown via liquid-phase epitaxy to form a composite material. At this point, the substrate material has a thickness of 550 μm, and the bismuth-substituted rare-earth iron garnet single crystal superimposed on the substrate material has a thickness of 400 μm. The crystal structures of the two layers are similar but different. The composite material is then placed in a single-sided grinding mill to grind and thin the side with the bismuth-substituted rare-earth iron garnet single crystal; at this point, the thickness of the bismuth-substituted rare-earth iron garnet single crystal layer is 370 μm. Next, the side of the composite material with the substrate material is ground and thinned until the substrate material is removed; at this point, the thickness of the bismuth-substituted rare-earth iron garnet single crystal layer is 340 μm, with warped edges. Finally, both sides of the composite material are simultaneously ground and thinned at the same speed. Thinning was stopped when the thickness of the bismuth-substituted rare-earth iron garnet single crystal reached 290-296 μm. At this point, the composite material consisted only of a bismuth-substituted rare-earth iron garnet single crystal layer, which was planar.

[0025] The wavelength tail of the Faraday rotatable plate produced by the above method is 1310 nm.

[0026] Figure 1-3 The dotted line represents the portion removed by grinding and thinning.

[0027] In summary, the principle of the Faraday rotation sheet manufacturing method of this invention is as follows: A composite material is formed by liquid-phase epitaxial growth of a bismuth-substituted rare-earth iron garnet single crystal on a substrate, facilitating the preparation of thinner Faraday rotation sheets. One side of the bismuth-substituted rare-earth iron garnet single crystal is ground and thinned to obtain an intermediate product meeting the standard thickness. The substrate material is removed by grinding. A flat bismuth-substituted rare-earth iron garnet single crystal layer is obtained by simultaneously grinding both sides. Because both sides are ground simultaneously, the force on both sides is uniform and balanced, preventing the composite material from bending or warping to one side and overcoming the curling effect. This results in a flatter Faraday rotation sheet with an effective aperture meeting the standard, thus improving the performance of the Faraday rotation sheet.

[0028] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for manufacturing a Faraday rotator plate, characterized in that, The method includes the following steps: (1) Fabrication of calcium magnesium zirconium doped gadolinium gallium garnet single crystals; (2) Using calcium magnesium zirconium doped gadolinium gallium garnet single crystal as substrate material, bismuth-substituted rare earth iron garnet single crystal is grown by liquid phase epitaxy to form a composite material; (3) Grind and thin the side of the composite material with bismuth-substituted rare earth iron garnet single crystal; (4) Grind and thin the side of the composite material with the substrate material; (5) Simultaneous grinding and thinning of both sides of the composite material; The composite material is simultaneously ground on both sides at the same speed; the composite material is thinned until the substrate material is removed; The thickness of the substrate material in step (2) is 550 μm, and the thickness of the bismuth-substituted rare earth iron garnet single crystal is 400 μm. The composite material is simultaneously ground and thinned on both sides until the thickness of the bismuth-substituted rare earth iron garnet single crystal is 290μm-296μm.

2. A Faraday rotator plate, characterized in that, The Faraday rotator is manufactured by the Faraday rotator manufacturing method according to claim 1.

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