Magneto-optic isolator

Abstract

The application relates to a magneto-optical isolator, and relates to the technical field of optical devices, which comprises a magneto-optical isolator mechanism, a light guide pipe and an adjusting mechanism. The magneto-optical isolator mechanism is provided with a through hole, and the magneto-optical isolator mechanism forms a magnetic field consistent along the direction of the through hole. The light guide pipe is axially arranged in the through hole, and the light guide pipe is internally provided with a magneto-optical crystal. The adjusting mechanism is connected with the light guide pipe and is used for adjusting the angle between the light guide pipe and the central axis of the through hole, so that the included angle between the end surface of the magneto-optical crystal and the incident polarized light is alpha, and the following condition is met: 88 DEG <= alpha <= 92 DEG. The application has the effect of ensuring that the incident polarized light propagates along the axial direction of the magneto-optical crystal as much as possible, thereby ensuring the low insertion loss and high isolation of the magneto-optical isolator.

Description

Technical Field

[0001] This application relates to the field of optical device technology, and in particular to a magneto-optical isolator. Background Technology

[0002] A magneto-optical isolator is a passive optical device that allows only unidirectional light transmission. Based on the non-reciprocity of the Faraday effect, it can effectively isolate the adverse effects of reverse light on the light source and system, and has wide applications in various optical applications that require optical isolation and unidirectional light transmission.

[0003] In related technologies, magneto-optical isolators cannot adjust the position of the magneto-optical crystal. If the end face of the magneto-optical crystal is not perpendicular to the incident direction of light, the incident polarized light will deviate from the axis of the magneto-optical crystal, increasing the insertion loss of the magneto-optical isolator and resulting in optical signal loss.

[0004] How to effectively reduce the insertion loss of magneto-optical isolators and reduce the loss of optical signals is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] This application aims to at least solve the technical problem in existing magneto-optical isolators where the position of the magneto-optical crystal is not adjustable, resulting in high insertion loss and optical signal loss. Therefore, this application proposes a magneto-optical isolator.

[0006] This application provides a magneto-optical isolator, comprising: A magneto-optical isolation mechanism is provided with perforations, and the magneto-optical isolation mechanism forms a magnetic field extending along the direction of the perforations; A light guide tube is axially disposed in the perforation, and a magneto-optical crystal is disposed inside the light guide tube; An adjustment mechanism, connected to the light guide tube, is used to adjust the angle between the light guide tube and the central axis of the perforation, so that the angle between the end face of the magneto-optical crystal and the incident direction of the incident polarized light is α, satisfying: 88°≤α≤92°.

[0007] By adopting the above technical solution, the angle between the light guide tube and the central axis of the perforation is adjusted by the adjustment mechanism so that the end face of the magneto-optical crystal is as perpendicular as possible to the incident direction of the incident polarized light. That is, the angle between the end face of the magneto-optical crystal and the incident direction of the incident polarized light is α, which satisfies: 88°≤α≤92°. This ensures that the incident polarized light propagates along the axial direction of the magneto-optical crystal as much as possible, thereby ensuring the low insertion loss and high isolation of the magneto-optical isolator.

[0008] Optionally, the angle α between the end face of the magneto-optical crystal and the incident direction of the incident polarized light is 90°.

[0009] By adopting the above technical solution, the insertion loss of the magneto-optical isolator can be further reduced, thereby reducing the loss of optical signals.

[0010] Optionally, the adjustment mechanism is installed on the outer wall of the magneto-optical isolation mechanism, and the adjustment end of the adjustment component is connected to the end of the light guide tube to be adapted to move laterally toward the light guide tube.

[0011] By adopting the above technical solution, the inner diameter of the perforation is larger than the outer diameter of the light guide tube, and the deflection of the light guide tube is constrained within the perforation. By limiting the deflection angle of the light guide tube within the perforation, the angle α between the end face of the magneto-optical crystal and the incident direction of the incident polarized light can be conveniently made to satisfy: 88°≤α≤92°.

[0012] Optionally, the adjustment mechanism includes: a first ring, a second ring, and an adjustment rod; The first ring is installed on the outer wall of the magneto-optical isolation mechanism; The second ring is sleeved on the end of the light guide tube, and an elastic element connects the second ring and the first ring. The adjusting rod is threaded onto the first ring and abuts against the wall of the second ring.

[0013] By adopting the above technical solution, the elastic element is clamped between the first ring and the second ring. The position of the second ring within the first ring can be adjusted by the adjusting rod, thereby causing the light guide tube to deflect within the perforation so that the end face of the magneto-optical crystal is as perpendicular as possible to the incident polarized light.

[0014] Optionally, the adjusting rod is disposed between adjacent elastic elements, and each elastic element is provided with the adjusting rod in the axial direction.

[0015] By adopting the above technical solution, rotating the adjusting rod can extend the portion of the adjusting rod between the first ring and the second ring, thereby compressing and contracting the elastic element corresponding to the adjusting rod. Conversely, rotating the adjusting rod can also shorten the portion of the adjusting rod between the first ring and the second ring, thereby releasing the elastic force of the elastic element corresponding to the adjusting rod.

[0016] During the above process, the peripheral wall of the second ring abuts against the end of the adjusting rod. This design makes the movement of the second ring more stable when adjusting the length of the adjusting rod between the first and second rings, thus making the deflection of the light guide tube within the perforation more stable.

[0017] Optionally, the number of adjustment mechanisms is two, and the adjustment ends of the two adjustment mechanisms are respectively connected to the two ends of the light guide tube.

[0018] Optionally, the second ring of one of the adjustment mechanisms is sleeved on the end of the light guide tube, and an elastic sleeve is sandwiched between the ring and the end of the light guide tube.

[0019] By adopting the above technical solution, compared to adjusting the position of the second ring of two adjustment mechanisms at the same time, adjusting only the second ring of one adjustment mechanism can deflect the light guide tube within the perforation, making the end face of the magneto-optical crystal perpendicular to the incident polarized light, thus simplifying the operation.

[0020] Optionally, the magneto-optical isolator further includes: a first polarizer and a second polarizer; The housing of the first polarizer is mounted on the first ring of the adjustment mechanism and together with the first ring forms a first cavity. The first cavity is used to guide the polarized light transmitted from the first polarizer to the light inlet of the light guide tube. The housing of the second polarizer is mounted on the first ring of another adjustment mechanism and together with the first ring forms a second cavity. The second cavity is used to guide the polarized light transmitted from the light guide tube outlet to the light inlet of the second polarizer.

[0021] By adopting the above technical solution, the outer shell of the first polarizer is installed on the first ring of the first adjustment mechanism and is enclosed by the first ring, which can prevent possible ambient light from entering the light guide tube from between the outer shell of the first polarizer and the first ring of the first adjustment mechanism.

[0022] Similarly, the housing of the second polarizer is mounted on the first ring of the second adjustment mechanism and encloses the first ring, which can prevent any ambient light from entering the light guide tube from between the housing of the first polarizer and the first ring of the second adjustment mechanism.

[0023] Optionally, the wall of the perforation has a protrusion, the center of the light guide tube abuts against the protrusion, and is adapted to deflect around the protrusion.

[0024] By adopting the above technical solution, compared with adjusting the position of the second ring of two adjustment mechanisms at the same time, only the second ring of one adjustment mechanism needs to be adjusted, so that the light guide tube deflects around the protrusion and inside the perforation, making the end face of the magneto-optical crystal perpendicular to the incident polarized light.

[0025] Optionally, a magnetic ring assembly is installed in the inner cavity of the magneto-optical isolation mechanism. The magnetic ring assembly is sleeved outside the light guide tube, and the magneto-optical crystal is located at the center of the magnetic ring assembly.

[0026] In summary, this application includes at least one of the following beneficial technical effects: by adjusting the angle between the light guide tube and the central axis of the perforation through the adjustment mechanism, the end face of the magneto-optical crystal is made as perpendicular as possible to the incident direction of the incident polarized light, that is, the angle between the end face of the magneto-optical crystal and the incident direction of the incident polarized light is α, which satisfies: 88°≤α≤92°, ensuring that the incident polarized light propagates along the axial direction of the magneto-optical crystal as much as possible, thereby ensuring the low insertion loss and high isolation of the magneto-optical isolator. Attached Figure Description

[0027] Figure 1 This is one of the structural schematic diagrams of the magneto-optical isolator provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the magneto-optical crystal provided in the embodiments of this application; Figure 3 This is a second schematic diagram of the structure of the magneto-optical isolator provided in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the light guide tube provided in the embodiment of this application; Figure 5 This is one of the structural schematic diagrams of the adjustment mechanism provided in the embodiments of this application; Figure 6 This is a second schematic diagram of the structure of the adjustment mechanism provided in the embodiments of this application; Figure 7 yes Figure 3 A magnified view of a portion of the image; Figure 8 This is the third schematic diagram of the magneto-optical isolator provided in the embodiments of this application; Figure 9 This is the fourth schematic diagram of the magneto-optical isolator provided in the embodiments of this application.

[0028] Figure label: 100. Magneto-optical isolation mechanism; 110. Perforation; 111. Protrusion; 120. Housing; 130. Magnetic ring assembly; 200. Light guide tube; 300. Adjusting mechanism; 311. First ring; 312. Second ring; 313. Adjusting rod; 314. Elastic element; 315. Elastic sleeve; 400. Magneto-optical crystal; 510, First polarizer; 511, First cavity; 520, Second polarizer; 521, Second cavity. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0030] Magneto-optical isolators have wide applications in various optical applications that require optical isolation and unidirectional light transmission.

[0031] For example, in the field of optical communication, it is used to isolate reflected signals in fiber optic communication, prevent signal interference and loss during back propagation, and improve the stability and performance of the communication system. In optical measurement and imaging systems, it is used to ensure the consistent direction of incident polarized light, thereby reducing measurement errors and improving image quality. In scientific research laboratories, it is used in various laboratory setups to separate optical paths, maintain optical interference, or measure specific optical properties.

[0032] In the aforementioned applications, the assembly precision of the magneto-optical crystal and the selection of its crystal system can cause the end face of the magneto-optical crystal to be not perpendicular to the incident direction of light. Furthermore, the position of the magneto-optical crystal in the related technology is not adjustable. This causes the incident polarized light to deviate from the axis of the magneto-optical crystal, increasing the insertion loss of the magneto-optical isolator and resulting in the loss of optical signal.

[0033] The following is for reference. Figures 1-9 A magneto-optical isolator according to an embodiment of this application is described.

[0034] like Figure 1 As shown, the magneto-optical isolator includes: a magneto-optical isolation mechanism 100, a light guide tube 200, and an adjustment mechanism 300.

[0035] The magneto-optical isolation mechanism 100 has a perforation 110 and forms a magnetic field extending along the direction of the perforation 110.

[0036] The light guide tube 200 can be a non-magnetic metal tube. The light guide tube 200 is axially positioned at the through hole 110, and a magneto-optical crystal 400 is provided inside the light guide tube 200.

[0037] The magneto-optical crystal 400 can be glued inside the light guide tube 200.

[0038] The magneto-optical crystal 400 can be selected as a cubic crystal system. The magneto-optical crystal 400 is optically isotropic and has the same optical properties in different directions.

[0039] In actual implementation, the magneto-optical crystal 400 can be selected from terbium gallium garnet TGG (Tb3Ga5O12), terbium scandium aluminum garnet TSAG (Tb3Sc2Al3G12), and potassium terbium fluoride KTF (KTb3F10).

[0040] Of course, the selection of non-cubic magneto-optical crystals such as lithium terbium fluoride LTF (LiTbF4) and cerium fluoride (CeF3) should also be permitted.

[0041] like Figure 2 As shown, the adjustment mechanism 300 is connected to the light guide tube 200 and is used to adjust the angle between the light guide tube 200 and the central axis of the perforation 110 so that the angle between the end face of the magneto-optical crystal 400 and the incident direction of the incident polarized light is α, which satisfies: 88°≤α≤92°.

[0042] Based on the Faraday effect, the incident polarized light enters from the light inlet of the light guide tube 200. After passing through the magneto-optical crystal 400 inside the light guide tube 200, the polarization plane of the incident polarized light will rotate. The rotation angle is only related to the direction of the magnetic field and the crystal properties (such as Verdet constant).

[0043] If the angle between the incident direction of the polarized light and the central axis of the end face of the magneto-optical crystal 400 is too large, the propagation path length of the polarized light in the magneto-optical crystal 400 will increase, resulting in more interactions within the magneto-optical crystal 400, such as absorption and scattering, which will increase the insertion loss of the magneto-optical isolator and cause optical signal loss.

[0044] In the above embodiments of this application, the angle between the light guide tube 200 and the central axis of the perforation 110 is adjusted by the adjustment mechanism 300 so that the end face of the magneto-optical crystal 400 is as perpendicular as possible to the incident direction of the incident polarized light, that is, the angle between the end face of the magneto-optical crystal 400 and the incident direction of the incident polarized light is α, which satisfies: 88°≤α≤92°, ensuring that the incident polarized light propagates along the axial direction of the magneto-optical crystal 400 as much as possible, thereby ensuring the low insertion loss and high isolation of the magneto-optical isolator.

[0045] It should be noted that the insertion loss can be measured experimentally based on the ratio of input optical power to output optical power. In other words, the insertion loss can be ensured to meet the actual requirements through testing.

[0046] like Figure 3 As shown, in some embodiments, the adjustment mechanism is installed on the outer wall of the magneto-optical isolation mechanism 100. The adjustment end of the adjustment mechanism 300 is connected to the end of the light guide tube 200 to be adapted to move to the side of the light guide tube 200, so that the angle α between the end face of the magneto-optical crystal 400 in the light guide tube 200 and the incident direction of the incident polarized light satisfies: 88°≤α≤92°.

[0047] The adjusting mechanism 300 can be at least one of the following structural forms: Firstly, both ends of the light guide tube 200 pass through the perforation 110; There are two adjustment mechanisms 300. The two adjustment mechanisms 300 are installed on the outer surface of the side wall of the magneto-optical isolation mechanism 100 and are connected to the end of the light guide tube 200 in a corresponding manner.

[0048] In this embodiment, two adjustment mechanisms 300 adjust the light guide tube 200 to deflect it. During this process, the tube wall of the light guide tube 200 does not contact the hole wall of the perforation 110.

[0049] Secondly, both ends of the light guide tube 200 pass through the perforation 110, or one end of the light guide tube 200 passes through the perforation 110 and the other end is inside the perforation 110; There is one adjustment mechanism 300, which is installed on the outer surface of the side wall of the magneto-optical isolation mechanism 100 and connected to the end of the light guide tube 200 (not shown).

[0050] In this embodiment, the light guide tube 200 is adjusted by an adjustment mechanism 300 to deflect the light guide tube 200. During this process, the tube wall of the light guide tube 200 will deflect with the hole wall of the perforation 110 as the fulcrum, and the diameter of the perforation 110 will increase in the direction away from the fulcrum.

[0051] In the above possible implementation, the inner diameter of the perforation 110 is larger than the outer diameter of the light guide tube 200, and the deflection of the light guide tube 200 is constrained within the perforation 110. By limiting the deflection angle of the light guide tube 200 within the perforation 110, the angle α between the end face of the magneto-optical crystal 400 and the incident direction of the incident polarized light can be made to satisfy 88°≤α≤92° more quickly.

[0052] like Figure 4 As shown, in actual execution, the angle between the light guide tube 200 and the central axis of the perforation 110 is β, which satisfies: -2°≤β≤2°.

[0053] In some embodiments, the angle α between the end face of the magneto-optical crystal 400 and the incident polarized light is 90°. This can further reduce the insertion loss of the magneto-optical isolator and reduce the loss of optical signal.

[0054] like Figure 3 and Figure 5 As shown, in some embodiments, the adjustment mechanism 300 includes a first ring 311, a second ring 312, and an adjustment rod 313.

[0055] The first ring 311 is installed on the outer surface of the side wall of the magneto-optical isolation mechanism 100.

[0056] The second ring 312 is sleeved on the end of the light guide tube 200, and an elastic element 314 is connected between the second ring 312 and the first ring 311. The elastic element 314 can be a spring.

[0057] The adjusting rod 313 is threaded onto the first ring 311 and abuts against the wall of the second ring 312.

[0058] In this embodiment, the elastic element 314 is clamped between the first ring 311 and the second ring 312. The position of the second ring 312 within the first ring 311 can be adjusted by the adjusting rod 313, so that the light guide tube 200 deflects within the perforation 110, so that the end face of the magneto-optical crystal 400 is as perpendicular as possible to the incident polarized light.

[0059] In actual implementation, the light guide tube 200 can be fixed in the first ring 311 by means of adhesive bonding or screw connection. The adjustment rod 313 can be a precision screw. The number of adjustment rods 313 is not limited to one. For example, two or three adjustment rods 313 can be used to achieve more precise adjustment according to actual needs.

[0060] In actual implementation, the adjusting rods 313 are arranged around the first ring 311. By adjusting the multiple adjusting rods 313 in the circumferential direction of the first ring 311, the light guide tube 200 can have more deflection directions within the perforation 110, so that the end face of the magneto-optical crystal 400 is perpendicular to the incident polarized light.

[0061] like Figure 6 As shown, in some embodiments, the adjusting rod 313 is disposed between adjacent elastic elements 314, and each elastic element 314 is provided with an adjusting rod 313 in the axial direction.

[0062] In this embodiment, by rotating the adjusting rod 313, the portion of the adjusting rod 313 between the first ring 311 and the second ring 312 can be extended, thereby causing the elastic element 314 corresponding to the adjusting rod 313 to be compressed and contracted. Conversely, the portion of the adjusting rod 313 between the first ring 311 and the second ring 312 can be shortened, thereby causing the elastic element 314 corresponding to the adjusting rod 313 to release its elastic force.

[0063] During the above process, the peripheral wall of the second ring 312 abuts against the end of the adjusting rod 313. This design makes the movement of the second ring 312 more stable when adjusting the length of the part of the adjusting rod 313 between the first ring 311 and the second ring 312, thereby making the deflection of the light guide tube 200 within the perforation 110 more stable.

[0064] like Figure 3 and Figure 7As shown, in some embodiments, there are two adjustment mechanisms 300, and the adjustment ends of the two adjustment mechanisms 300 are respectively connected to the two ends of the light guide tube 200.

[0065] The second ring 312 of the first adjustment mechanism 300 is sleeved on the end of the light guide tube 200, and an elastic sleeve 315 is sandwiched between the second ring 312 and the end of the light guide tube 200.

[0066] By keeping the second ring 312 of the first adjustment mechanism 300 stationary, the second ring 312 of the second adjustment mechanism 300 moves to deflect the light guide tube 200 within the perforation 110 and compress the elastic sleeve 315.

[0067] Compared to adjusting the position of the second ring 312 of two adjustment mechanisms 300 at the same time, adjusting only the second ring 312 of one adjustment mechanism 300 can deflect the light guide tube 200 within the perforation 110, making the end face of the magneto-optical crystal 400 perpendicular to the incident polarized light, thus simplifying the operation.

[0068] Of course, it is also permissible to sandwich elastic sleeves 315 between the second ring 312 of the two adjustment mechanisms 300 and the light guide tube 200, and to adjust the position of the second ring 312 of the two adjustment mechanisms 300 in turn.

[0069] like Figure 8 As shown, based on the same concept, a protrusion 111 can also be provided on the wall of the perforation 110, with the center of the light guide tube 200 abutting against the protrusion 111. Only the second ring 312 of the adjustment mechanism 300 is adjusted so that the light guide tube 200 deflects around the protrusion 111 within the perforation 110, making the end face of the magneto-optical crystal 400 perpendicular to the incident polarized light.

[0070] like Figure 9 As shown, in some embodiments, the magneto-optical isolator further includes a first polarizer 510 and a second polarizer 520.

[0071] The outer shell 120 of the first polarizer 510 is mounted on the first ring 311 of the first adjustment mechanism 300, and together with the first ring 311, they form a first cavity 511. The first cavity 511 is used to guide the polarized light transmitted from the first polarizer 510 to the light inlet of the light guide tube 200.

[0072] The housing 120 of the second polarizer 520 is mounted on the first ring 311 of the second adjustment mechanism 300, and together with the first ring 311, forms a second cavity 521. The second cavity 521 is used to guide the polarized light transmitted from the light outlet of the light guide tube 200 to the light inlet of the second polarizer 520.

[0073] In this embodiment, the outer shell 120 of the first polarizer 510 is mounted on the first ring 311 of the first adjustment mechanism 300 and surrounds the first ring 311, which can prevent ambient light from entering the light guide tube 200 from between the outer shell 120 of the first polarizer 510 and the first ring 311 of the first adjustment mechanism 300.

[0074] Similarly, the housing 120 of the second polarizer 520 is mounted on the first ring 311 of the second adjustment mechanism 300 and surrounds the first ring 311, which can prevent ambient light from entering the light guide tube 200 from between the housing 120 of the first polarizer 510 and the first ring 311 of the second adjustment mechanism 300.

[0075] In actual operation, there is a 45° angle between the transmission direction of the first polarizer 510 and the transmission direction of the second polarizer 520. For example, the polarized light after passing through the first polarizer 510 enters the magneto-optical crystal 400 while maintaining its polarization state. Under the action of the magneto-optical effect, it rotates by 45° and then passes through the second polarizer 520.

[0076] In actual implementation, the first polarizer 510 and the second polarizer 520 include, but are not limited to, PBS, Glan Taylor prisms, and absorption polarizers.

[0077] like Figure 9 As shown, in some embodiments, the magneto-optical isolation mechanism 100 further includes a housing 120 and a magnetic ring assembly 130.

[0078] The magnetic ring assembly 130 is installed in the inner cavity of the housing 120 and is located at the center of the housing 120. The magnetic ring assembly 130 forms a through hole 110 for housing the light guide tube 200. The through hole 110 passes through the housing 120 along the axial direction of the magnetic ring assembly 130. The magneto-optical crystal 400 is located at the center of the magnetic ring assembly 130.

[0079] The second rings 312 of the two adjustment mechanisms 300 are respectively installed on different sides of the housing 120, and the first rings 311 of the adjustment mechanism 300 are sleeved on the end of the light guide tube 200.

[0080] In actual implementation, the magnetic ring assembly 130 can be assembled from fan-shaped magnets, including but not limited to samarium cobalt alloy or neodymium iron boron alloy. The magnetic ring assembly 130 can also include a magnetic ring and magnetic tiles, with the magnetic tiles distributed on both sides of the magnetic ring. The magnetic field lines formed by the magnetic ring can be parallel to the incident direction of the incident polarized light.

[0081] In actual implementation, the magneto-optical crystal 400 includes, but is not limited to, non-cubic magneto-optical materials such as LTF crystals or CeF3, or cubic magneto-optical crystals such as TGG crystals, magneto-optical glass, and KTF crystals.

[0082] This application includes at least one of the following beneficial technical effects: 1. By adjusting the angle between the light guide tube 200 and the central axis of the perforation 110 through the adjustment mechanism 300, the tilt angle of the magneto-optical crystal 400 can be effectively corrected so that the end face of the magneto-optical crystal 400 is as perpendicular as possible to the incident direction of the incident polarized light, ensuring that the incident polarized light propagates along the axis of the magneto-optical crystal 400 as much as possible, thereby reducing the adverse effects of the insertion loss of the magneto-optical isolator and the depolarization effect caused by birefringence on the isolation.

[0083] 2. The inner diameter of the perforation 110 is larger than the outer diameter of the light guide tube 200. The deflection of the light guide tube 200 is constrained within the perforation 110. By limiting the deflection angle of the light guide tube 200 within the perforation 110, the angle α between the end face of the magneto-optical crystal 400 and the incident direction of the incident polarized light can be made to satisfy 88°≤α≤92° more quickly.

[0084] 3. The angle α between the end face of the magneto-optical crystal 400 and the incident polarized light is 90°, which can further reduce the insertion loss of the magneto-optical isolator and reduce the loss of optical signal.

[0085] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A magneto-optical isolator, characterized in that, include: A magneto-optical isolation mechanism (100) is provided with a perforation (110), and the magneto-optical isolation mechanism (100) forms a magnetic field extending along the direction of the perforation (110); A light guide tube (200) is axially disposed in the perforation (110), and a magneto-optical crystal (400) is installed inside the light guide tube (200); An adjustment mechanism (300) is connected to the light guide tube (200) and is used to adjust the angle between the light guide tube (200) and the central axis of the perforation (110) so that the angle between the end face of the magneto-optical crystal (400) and the incident polarized light is α, satisfying: 88°≤α≤92°.

2. The magneto-optical isolator according to claim 1, characterized in that, The angle α between the end face of the magneto-optical crystal (400) and the incident direction of the incident polarized light is 90°.

3. The magneto-optical isolator according to claim 1, characterized in that, The adjustment mechanism (300) is installed on the outer side wall of the magneto-optical isolation mechanism (100), and the adjustment end of the adjustment mechanism (300) is connected to the end of the light guide tube (200) to be adapted to move laterally toward the light guide tube (200).

4. The magneto-optical isolator according to claim 3, characterized in that, The adjustment mechanism (300) includes: The first ring (311) is installed on the outer wall of the magneto-optical isolation mechanism (100); The second ring (312) is sleeved on the end of the light guide tube (200), and an elastic element (314) is connected between the second ring (312) and the first ring (311); The adjusting rod (313) is threaded onto the first ring (311) and abuts against the wall of the second ring (312).

5. The magneto-optical isolator according to claim 4, characterized in that, The adjusting rod (313) is disposed between adjacent elastic elements (314), and the adjusting rod (313) is provided on the axial direction of each elastic element (314).

6. The magneto-optical isolator according to claim 4, characterized in that, There are two adjustment mechanisms (300), and the adjustment ends of the two adjustment mechanisms (300) are connected to the two ends of the light guide tube (200) in a one-to-one correspondence.

7. The magneto-optical isolator according to claim 6, characterized in that, The second ring (312) of the adjustment mechanism (300) is sleeved on the end of the light guide tube (200), and an elastic sleeve (315) is sandwiched between the adjustment mechanism (300) and the end of the light guide tube (200).

8. The magneto-optical isolator according to claim 4, characterized in that, The magneto-optical isolator also includes: A first polarizer (510) has its housing (120) mounted on the first ring (311) of an adjustment mechanism (300) and forming a first cavity (511) with the first ring (311). The first cavity (511) is used to guide the polarized light transmitted from the first polarizer (510) to the light inlet of the light guide tube (200). The second polarizer (520) has its housing (120) mounted on the first ring (311) of another adjustment mechanism (300) and forming a second cavity (521) with the first ring (311). The second cavity (521) is used to guide the polarized light transmitted from the light outlet of the light guide tube (200) to the light inlet of the second polarizer (520).

9. The magneto-optical isolator according to any one of claims 1-8, characterized in that, The wall of the perforation (110) has a protrusion (111), the center of the light guide tube (200) abuts against the protrusion (111) and is adapted to deflect around the protrusion (111).

10. The magneto-optical isolator according to any one of claims 1-8, characterized in that, The inner cavity of the magneto-optical isolation mechanism (100) is equipped with a magnetic ring assembly (130), which is sleeved outside the light guide tube (200), and the magneto-optical crystal (400) is located at the center of the magnetic ring assembly (130).

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