Magnet structure and compact high-power optical isolator

Abstract

The utility model relates to a kind of magnet structure, including two groups of upper, lower symmetrical combination magnet, the combination magnet all includes middle magnet, the left front of the middle magnet and right front all is provided with front end magnet, the left rear of the middle magnet and right rear all is provided with rear end magnet, the middle magnet all is magnetized along horizontal axis, the front, rear end magnet all is magnetized along face diagonal, two groups of upper, lower symmetrical combination magnet form closed magnetic circuit, and magnetic field rotation focuses magnetic line to central region.Compared with traditional Halbach magnet structure, magnetic flux is significantly enhanced under the same volume, and magnetic field strength is improved by 8%.Under the condition of providing the same magnetic force, the volume is reduced by 36%, and the space utilization is greatly improved.Through the synergistic effect of spacing adjustment and magnetic conducting block, the utilization rate of magnetic field is further optimized, and finally a high-power optical isolator with simplified structure and compact volume is realized.

Description

Technical Field

[0001] This utility model relates to a magnet structure and a compact high-power optical isolator, and relates to the field of optical technology. Background Technology

[0002] In the field of laser processing, optical isolators are key components of fiber lasers. As a passive device, an optical isolator only allows forward light to pass through while effectively blocking reverse light. Traditional optical isolators employ a symmetrical arrangement of permanent magnets, whose magnetic field strength and uniformity are limited by the magnetic circuit closure efficiency. Since the magnetic field generated by the permanent magnets is fixed, it is difficult to achieve effective adjustment, and the existing radial arrangement structure is bulky, failing to meet the miniaturization requirements of equipment and hindering cost reduction. Therefore, there is an urgent need to develop a magnet structure that can solve the above problems and be applied to optical isolators. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a magnet structure and a compact high-power optical isolator, which aims to solve the problems of large size and insufficient magnetic field strength of existing optical isolators.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a magnet structure, including two sets of upper and lower symmetrical combination magnets, each combination magnet including a middle magnet, a front magnet is provided at the left front and right front of the middle magnet, and a rear magnet is provided at the left rear and right rear of the middle magnet. The middle magnets are all magnetized along the horizontal axis, and the front and rear magnets are all magnetized along the face diagonal. The two sets of upper and lower symmetrical combination magnets form a closed magnetic circuit, and the magnetic field lines are focused to the central region by rotating the magnetic field.

[0005] Preferably, an XYZ coordinate system is constructed, wherein the origin of the XYZ coordinate system is located at the midpoint between the upper and lower middle magnets;

[0006] The upper middle magnet is magnetized along the horizontal Y-axis, specifically in the direction of [0, -1, 0]; the upper left front magnet has a specific magnetization direction of... The specific magnetization direction of the front right magnet is as follows: The specific magnetization direction of the rear magnet at the top left is: The specific magnetization direction of the rear magnet at the upper right is as follows:

[0007] The lower middle magnet is magnetized along the horizontal Y-axis, specifically in the direction of [0, -1, 0]; the lower left front magnet has a specific magnetization direction of... The specific magnetization direction of the front right magnet is as follows: The specific magnetization direction of the rear magnet at the bottom left is as follows: The specific magnetization direction of the rear magnet at the bottom right is as follows:

[0008] A compact high-power optical isolator includes an optical isolator body, wherein a square combined magnet is disposed in the optical isolator body, and the square combined magnet adopts the aforementioned magnet structure.

[0009] Preferably, the optical isolator body includes, in sequence, an input fiber collimator, a first beam splitter, a rotating plate, a square combined magnet, a first magnetic guide block, a magneto-optical crystal, a second magnetic guide block, a second beam splitter, an aperture, and a beam expander collimating output optical system.

[0010] Preferably, the magneto-optical crystal is placed at the center of the square composite magnet.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. Compared to the traditional Hellbeck magnet structure, the magnetic flux is significantly enhanced and the magnetic field strength is increased by 8% within the same volume. While providing the same magnetic force, the volume is reduced by 36%, resulting in a significant improvement in space utilization.

[0013] 2. By adjusting the spacing and working in conjunction with the magnetic block, the magnetic field utilization rate is further optimized, ultimately achieving a high-power optical isolator with a simplified structure and compact size.

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1a Rear view of a conventional Hellbeck array magnet;

[0016] Figure 1b Side view of a conventional Hellbeck array magnet;

[0017] Figure 1c Front view of a conventional Hellbeck array magnet;

[0018] Figure 1a , Figure 1c The front and rear magnets are composed of a pair of magnets with opposite magnetization directions; Figure 1b The side view shows that the magnetization direction of the middle magnet and the magnets at both ends is at a 90-degree angle.

[0019] Figure 2a This is a top view of the magnet structure according to an embodiment of the present invention;

[0020] Figure 2b This is a cross-sectional view of the magnet structure according to an embodiment of the present utility model;

[0021] Figure 3aThis is a rear view of the magnet structure according to an embodiment of the present utility model;

[0022] Figure 3b This is a front view of the magnet structure according to an embodiment of the present invention;

[0023] Figure 4 This is a comparison diagram of the magnetic field strength distribution of the same volume between the magnet structure of this utility model embodiment and the traditional Heilbeck array magnet;

[0024] Figure 5 This is a cross-sectional view of the optical isolator according to an embodiment of the present invention;

[0025] Figure 6 This is a top view of the optical isolator according to an embodiment of the present invention.

[0026] In the picture:

[0027] Top left rear end magnet 100, top right rear end magnet 101, top middle magnet 102, top left front end magnet 103, top right front end magnet 104;

[0028] The rear end magnet 105 is located at the bottom left rear end; the rear end magnet 106 is located at the bottom right rear end; the middle magnet 107 is located at the bottom; the front end magnet 108 is located at the bottom left front end; and the front end magnet 109 is located at the bottom right front end.

[0029] The system includes an input fiber collimator 200, a first beam splitter 201, a rotating plate 202, a first magnetic guide block 203, a magneto-optical crystal 204, a second magnetic guide block 205, a second beam splitter 206, an aperture 207, a beam expander collimation output optical system 208, and a square combined magnet 209. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] like Figures 2a-4As shown, this embodiment provides a magnet structure including two sets of symmetrically arranged magnets, each of which consists of five small square magnets. Each magnet includes a central magnet, with front magnets located at the front left and front right of the central magnet, and rear magnets located at the rear left and rear right of the central magnet. The central magnets are magnetized along a horizontal axis, and the front and rear magnets are magnetized along their face diagonals. The front and rear magnets are sized to match the central magnets. The two sets of symmetrically arranged magnets form a closed magnetic circuit, and the magnetic field lines are focused to the central region by rotating the magnetic field.

[0034] The combined magnet system uses magnetic connecting plates to fix each magnetic block and precision screws to adjust the spacing between the upper and lower magnets, achieving stepless adjustment of the magnetic field. This technology is existing and will not be elaborated upon here. Compared to traditional Hellbeck arrays, this novel combined magnet structure significantly increases magnetic flux within the same volume by optimizing the magnetization direction, enhancing the central magnetic field strength and reducing magnetic leakage. While providing the same magnetic force, the overall magnet volume is reduced, resulting in a significant improvement in space utilization.

[0035] In this embodiment of the utility model, an XYZ coordinate system is constructed, wherein the origin of the XYZ coordinate system is located at the midpoint between the upper and lower intermediate magnets;

[0036] The upper middle magnet 102 is magnetized along the horizontal Y-axis, specifically in the direction of [0, -1, 0]; the upper left front magnet 103 has a specific magnetization direction of... The specific magnetization direction of the front right magnet 104 is as follows: The specific magnetization direction of the rear left magnet 100 is as follows: The specific magnetization direction of the rear right magnet 101 is as follows:

[0037] The lower middle magnet 107 is magnetized along the horizontal Y-axis, specifically in the direction of [0, -1, 0]; the lower left front magnet 108 has a specific magnetization direction of... The specific magnetization direction of the front magnet 109 on the lower right is as follows: The specific magnetization direction of the rear left magnet 105 is as follows: The specific magnetization direction of the rear magnet 106 at the bottom right is as follows:

[0038] Ten magnets form a closed magnetic circuit, and the rotation of the magnetic field focuses the magnetic field lines to the central region. For example... Figure 4As shown, under the same volume and materials, the magnetic field strength simulation comparison of the embodiment of this utility model with that of a traditional Hellbeck array magnet shows an increase of approximately 8% in the magnetic field strength of the central region. Combined with the magnetic guide block, the overall magnetic circuit efficiency is significantly improved, meeting the dual requirements of miniaturization and strong magnetic field for high-power optical isolators.

[0039] like Figures 5-6 As shown, this embodiment also provides a compact high-power optical isolator, including an optical isolator body, wherein a square combined magnet is disposed in the optical isolator body, and the square combined magnet adopts the aforementioned magnet structure.

[0040] In this embodiment of the utility model, the optical isolator body includes, in sequence, an input fiber collimator 200, a first beam splitter 201, a rotating plate 202, a square combined magnet 209, a first magnetic guide block 203, a magneto-optical crystal 204, a second magnetic guide block 205, a second beam splitter 206, an aperture 207, and a beam expansion and collimation output optical system 208.

[0041] In this embodiment of the invention, the magneto-optical crystal is placed at the center of a square combination of magnets, with the two magnets symmetrically distributed on the upper and lower sides of the magneto-optical crystal. The magnetic guide block directs the magnetic field to the light-passing area of ​​the magneto-optical crystal. Through spacing adjustment and the synergistic effect of the magnetic guide block, the magnetic field utilization rate is further optimized, ultimately achieving a high-power optical isolator with a simplified structure and compact size.

[0042] A square combined magnet and a pair of magnetic guide blocks (first and second magnetic guide blocks) are arranged around the magneto-optical crystal 204. The light emitted from the fiber collimator 200 is split into p-beams and s-beams with mutually perpendicular polarization directions by the first beam splitter 201. After passing through the rotating plate 202, the polarization directions of the two beams rotate synchronously counterclockwise by 45 degrees. After passing through the magneto-optical crystal 204, the polarization directions rotate counterclockwise by another 45 degrees, ultimately becoming perpendicular to the polarization direction after the first beam splitter 201. Finally, the beams are combined into a single beam by the second beam splitter 206 and output to the beam expander collimation output optical system through the aperture 207. The magneto-optical crystal 204 is placed at the center of the square combined magnet. The distance between the upper and lower combined magnets can be adjusted by precision screws and an adjusting cover plate (not shown), allowing for stepless adjustment of the magnetic field and convenient operation. A pair of magnetic guide blocks (first and second magnetic guide blocks) are located at both ends of the magneto-optical crystal 204, used to guide the magnetic field of the square combined magnet to the light-passing area inside the magneto-optical crystal 204. The magnetic field direction of the square combined magnet is shown in the attached figure. Figures 2a-3b As shown.

[0043] Compared to traditional Hellbeck magnet structures, this design significantly enhances magnetic flux and increases magnetic field strength by 8% within the same volume. Furthermore, it reduces volume by 36% while providing the same magnetic force, resulting in a substantial improvement in space utilization. Through spacing adjustment and the synergistic effect of the magnetic guide blocks, magnetic field utilization is further optimized, ultimately achieving a simplified and compact high-power optical isolator.

[0044] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A magnet structure, characterized in that: It includes two sets of symmetrically arranged magnets, each of which includes a middle magnet. The middle magnet has a front magnet located to its left front and right front, and a rear magnet located to its left rear and right rear. The middle magnet is magnetized along a horizontal axis, and the front and rear magnets are magnetized along their face diagonals. The two sets of symmetrically arranged magnets form a closed magnetic circuit, and the magnetic field rotation focuses the magnetic lines of force to the central region.

2. The magnet structure according to claim 1, characterized in that: Construct an XYZ coordinate system, the origin of which is located at the midpoint between the upper and lower middle magnets; The upper middle magnet is magnetized along the horizontal Y-axis, specifically in the direction of [0, -1, 0]; the upper left front magnet has a specific magnetization direction of... The specific magnetization direction of the front right magnet is as follows: The specific magnetization direction of the rear magnet at the top left is: The specific magnetization direction of the rear magnet at the upper right is as follows: The lower middle magnet is magnetized along the horizontal Y-axis, specifically in the direction of [0, -1, 0]; the lower left front magnet has a specific magnetization direction of... The specific magnetization direction of the front right magnet is as follows: The specific magnetization direction of the rear magnet at the bottom left is as follows: The specific magnetization direction of the rear magnet at the bottom right is as follows:

3. A compact high-power optical isolator, comprising an optical isolator body, characterized in that: The optical isolator body is provided with a square combined magnet, which adopts the magnet structure as described in any one of claims 1-2.

4. The compact high-power optical isolator according to claim 3, characterized in that: The optical isolator body includes, in sequence, an input fiber collimator, a first beam splitter, a rotating plate, a square combined magnet, a first magnetic guide block, a magneto-optical crystal, a second magnetic guide block, a second beam splitter, an aperture, and a beam expander collimating output optical system.

5. The compact high-power optical isolator according to claim 4, characterized in that: The magneto-optical crystal is placed at the center of the square composite magnet.

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