Optical isolator with adjustable wavelength
By setting the relative position between the adjustable TGG crystal and the magnet in the optical isolator, the problem of poor optical isolation characteristics for different wavelengths is solved, and the stepless adjustment of the isolation degree of light of different wavelengths is achieved, which improves the universality of the product and reduces the demand for spare materials.
Patent Information
- Application Number
- CN202421397783.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-06-19
AI Technical Summary
Existing optical isolators have different isolation characteristics for light of different wavelengths, which leads to the need to replace the isolators when the wavelength changes, reducing the versatility of the product and increasing the demand for spare materials.
By setting the adjustable relative position between the TGG crystal and the magnet in the optical isolator, the sliding joint and connecting part design can achieve dynamic adjustment of the TGG crystal position, thereby adapting to the isolation needs of different wavelengths of light.
The isolation of light of different wavelengths is achieved, which improves product versatility and reduces the demand for spare materials.
Smart Images
Figure CN222850828U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of laser devices, in particular to an optical isolator with adjustable wavelength. Background Art
[0002] Magneto-optical devices use the Faraday effect to block the return light in the optical path to reduce its adverse effects. Its main features are: low forward insertion loss, high reverse isolation, and high return loss. In the application of free space isolators, when light passes through the incident PBS prism (polarizer) and the Faraday rotator, the polarization state rotates 45 degrees and then enters the exit PBS prism. When the light beam enters in the opposite direction through the exit PBS prism, the polarization state will rotate 45 degrees again in the same direction. At this time, it cannot pass through the TGG crystal (magneto-optical crystal), thereby achieving a one-way isolation effect of light.
[0003] Different wavelengths of light have different isolation characteristics, which can be adjusted by the relative position of the TGG crystal and the magnet in the copper tube. However, the current isolators are one isolator corresponding to one wavelength. If the wavelength changes in the scene, another isolator needs to be replaced to meet the use. As a result, each wavelength product needs to correspond to a copper tube, which makes the product less versatile and requires more spare materials. Utility Model Content
[0004] In order to solve the above technical problems, the utility model provides a wavelength-adjustable optical isolator, which can adjust the relative position between the TGG crystal and the magnet, so as to obtain different isolation degrees to meet the requirements of different wavelengths of light and improve the versatility of the product.
[0005] The technical solution adopted by the utility model to solve its technical problems is:
[0006] A wavelength-adjustable optical isolator comprises a coaxially arranged shell, a copper pipe, a magnetic ring and a PBS prism, wherein the number of the PBS prisms is two, the shell is arranged between the two PBS prisms, the two ends of the interior of the shell are provided with a first mounting groove and a second mounting groove that are connected, the magnetic ring is arranged in the second mounting groove and abuts against the end of the second mounting groove close to the first mounting groove, the copper pipe comprises a sliding portion and a connecting portion, the sliding portion is movably arranged in the first mounting groove along the length direction of the first mounting groove, a TGG crystal is arranged at one end of the connecting portion away from the sliding portion, and the TGG crystal is at least partially located in the magnetic ring.
[0007] Preferably, the inner wall of the first installation groove is provided with an internal thread, the outer wall of the sliding portion is provided with an external thread, and the internal thread matches the external thread.
[0008] Preferably, a first threaded hole is provided on an outer wall of the first mounting groove, a first set screw is provided in the first threaded hole, and the first set screw abuts against an outer wall of the sliding portion.
[0009] Preferably, a mirror cover and a pressure ring are further provided in the second mounting groove, and the mirror cover is arranged at an end away from the first mounting groove, the pressure ring is arranged between the magnetic ring and the mirror cover, a second threaded hole is provided on the mirror cover, a second fixing screw is provided in the second threaded hole, and the second fixing screw abuts against the pressure ring.
[0010] Preferably, the two PBS prisms are respectively a first PBS prism and a second PBS prism, a PBS bracket is provided on the lens cover, a first mounting hole is provided in the PBS bracket, and the first PBS prism is provided in the first mounting hole.
[0011] Preferably, a third mounting groove connected to the first mounting groove is provided at one end of the interior of the shell away from the second mounting groove, the diameter of the third mounting groove is larger than the first mounting groove, a mounting frame is detachably provided in the third mounting groove, the second PBS prism is provided in the mounting frame, and an optical path escape port connected to the second PBS prism is provided on the outer wall of the mounting frame.
[0012] Preferably, the mounting bracket includes a connecting portion and a mounting portion connected to each other, the connecting portion is detachably connected to the third mounting slot, a second mounting hole is provided in the mounting portion, the second PBS prism is arranged in the second mounting hole, and the optical path escape port is connected to the second mounting hole.
[0013] Preferably, the outer wall of the mounting portion is rotatably provided with a ring for opening or closing the optical path escape opening.
[0014] Preferably, the first mounting slot is connected to the second mounting slot via a limiting hole, and the connecting portion is inserted into the limiting hole.
[0015] Preferably, a bracket is provided on the outer wall of the shell.
[0016] Compared with the prior art, the wavelength-adjustable optical isolator of the utility model embodiment has the following beneficial effects: a magnetic ring is arranged in the second mounting groove, and the magnetic ring abuts against the end of the second mounting groove close to the first mounting groove, that is, the position of the magnetic ring is fixed, and the copper pipe is arranged as a sliding part and a connecting part, the sliding part can move along the length direction of the first mounting groove, and a TGG crystal is arranged at one end of the connecting part away from the sliding part, and the TGG crystal is at least partially located in the magnetic ring, so that in the process of the sliding part moving along the first mounting groove, the TGG crystal will move relative to the position of the magnetic ring, so that the relative position between the TGG crystal and the magnetic ring can be adjusted, and different isolation degrees are obtained to meet the requirements of light of different wavelengths, thereby improving the versatility of the product and reducing spare materials. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 The figure is a schematic diagram of the structure of the wavelength-adjustable optical isolator of the utility model.
[0018] Figure 2 It is a cross-sectional view of the wavelength-adjustable optical isolator of the utility model.
[0019] Figure 3 A brief description of the isolation adjustment.
[0020] Wherein: 1-housing, 2-copper pipe, 3-magnetic ring, 4-PBS prism, 5-first fixing screw, 6-mirror cover, 7-pressure ring, 8-PBS bracket, 9-mounting frame, 10-circle, 11-bracket, 12-magnetic field, 13-TGG crystal, 14-optical escape port. DETAILED DESCRIPTION
[0021] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0022] like Figure 1-2As shown, a wavelength-adjustable optical isolator according to a preferred embodiment of the utility model comprises a coaxially arranged housing 1, a copper pipe 2, a magnetic ring 3 and a PBS prism 4. There are two PBS prisms 4, and the housing 1 is arranged between the two PBS prisms 4. The PBS prism 4 is an optical path element that reflects and refracts light. A first mounting groove and a second mounting groove that are connected are arranged at both ends of the interior of the housing 1. The magnetic ring 3 is arranged in the second mounting groove and abuts against the end of the second mounting groove close to the first mounting groove. The copper pipe 2 comprises a sliding part and a connecting part. The sliding part can be movably arranged in the first mounting groove along the length direction of the first mounting groove. A TGG crystal 13 is arranged at one end of the connecting part away from the sliding part. The TGG crystal 13 is at least partially located in the magnetic ring. The magnetic ring 3 is used to provide a magnetic field of the Faraday magneto-optical effect, and the TGG crystal 13 is used as a Faraday rotator.
[0023] The wavelength-adjustable optical isolator based on the above technical features is configured such that a magnetic ring 3 is arranged in the second mounting groove, and the magnetic ring 3 abuts against the end of the second mounting groove close to the first mounting groove, that is, the position of the magnetic ring 3 is fixed, and the copper pipe 2 is configured as a sliding portion and a connecting portion, the sliding portion can move along the length direction of the first mounting groove, and a TGG crystal 13 is arranged at one end of the connecting portion away from the sliding portion, and the TGG crystal 13 is at least partially located in the magnetic ring 3, so that in the process of the sliding portion moving along the first mounting groove, the TGG crystal 13 will move relative to the position of the magnetic ring 3, so that the relative position between the TGG crystal 13 and the magnetic ring 3 can be adjusted to obtain different isolation degrees to meet the requirements of light of different wavelengths, thereby improving the versatility of the product and reducing spare materials.
[0024] In this embodiment, the inner wall of the first mounting groove is provided with an internal thread, and the outer wall of the sliding connection is provided with an external thread, and the internal thread matches the external thread. Through the threaded connection, the copper pipe 2 can be adjusted forward and backward within a specific range in the housing 1 to obtain different isolations to adapt to different wavelengths. At the same time, the outer wall of the first mounting groove is provided with a first threaded hole, and the first threaded hole is provided with a first set screw 5, and the first set screw 5 is abutted against the outer wall of the sliding connection. After the position of the copper pipe 2 is adjusted, the copper pipe 2 is completely locked using the first set screw 5. When it needs to be adjusted again, loosen the first set screw 5, and use its own thread for adjustment again. After the adjustment is completed, use the first set screw 5 to lock it again.
[0025] In this embodiment, a mirror cover 6 and a pressure ring 7 are further provided in the second mounting groove, and the mirror cover 6 is provided at an end away from the first mounting groove, and the pressure ring 7 is provided between the magnetic ring 3 and the mirror cover 6, and the pressure ring 7 is used to provide size compensation for the magnetic ring 3 so that the external dimensions of isolators suitable for different wavelengths are consistent. A second threaded hole is provided on the mirror cover 6, and a second set screw is provided in the second threaded hole, and the second set screw abuts against the pressure ring 7. Under the action of the mirror cover 6 and the second set screw, the magnetic ring 3 and the pressure ring 7 are completely fixed.
[0026] In this embodiment, a PBS bracket 8 is provided on the lens cover 6, a first mounting hole is provided in the PBS bracket 8, and the first PBS prism is provided in the first mounting hole. That is, the PBS bracket 8 is used to install the first PBS prism, and a cover body can be provided at one end of the first PBS prism away from the housing 1, and the cover body is covered in the first mounting hole to protect the first PBS prism.
[0027] In this embodiment, a third mounting groove connected to the first mounting groove is provided at one end of the housing 1 away from the second mounting groove, the diameter of the third mounting groove is larger than the first mounting groove, a mounting frame 9 is detachably provided in the third mounting groove, the second PBS prism is provided in the mounting frame 9, and an optical path escape port connected to the second PBS prism is provided on the outer wall of the mounting frame 9. That is, the second PBS prism is installed in the mounting frame 9, and when the copper pipe 2 needs to be adjusted, the mounting frame 9 is disassembled, the first fixing screw 5 is loosened, and the copper pipe 2 is rotated using a screwdriver or other tools, and the relative position between the copper pipe 2 and the housing 1 is measured after the rotation to confirm whether it is in the required position, and after confirmation, the first fixing screw 5 is tightened again to completely fix the copper pipe 2, and the disassembled parts are reinstalled to achieve the requirement of adjusting the isolation to adapt to the use of different wavelengths.
[0028] Specifically, the mounting frame 9 includes a connecting portion and a mounting portion connected to each other, and the connecting portion is connected to the third mounting slot by screws, so that it can be easily disassembled and installed. A second mounting hole is provided in the mounting portion, and the second PBS prism is arranged in the second mounting hole, and the optical path escape port 14 is connected to the second mounting hole.
[0029] At the same time, in order to facilitate opening or closing the optical path escape opening 14, the outer wall of the mounting portion is rotatably provided with a ring 10 for opening or closing the optical path escape opening 14. In addition, an end of the ring 10 away from the housing may be provided with an end cap, which is covered in the second mounting hole to shield and protect the second PBS prism.
[0030] In this embodiment, the first installation slot is connected to the second installation slot via a limiting hole, and the connecting portion is inserted into the limiting hole, so that the movement accuracy of the copper pipe 2 can be ensured.
[0031] In this embodiment, the outer wall of the housing 1 is provided with a bracket 11 for fixing the isolator and providing a fixing method for the user. When adjusting the position of the copper pipe 2, the bracket 11 also needs to be disassembled.
[0032] like Figure 3 As shown, when TGG is on one side of the magnetic field 12, the output isolation is K1, and when it is on the other side, the output isolation is K2. Correspondingly, the isolation required when the light wavelength λ1 is used is K1, and the isolation required for the light wavelength λ2 is K2. When TGG is in different positions, the adapted light wavelength is different. Therefore, by adjusting the relative position between the TGG crystal and the magnet, the present application can steplessly adjust the isolation of the wavelength band light, and can be used as a broad-spectrum wavelength isolator.
[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.
Claims
1. A wavelength-tunable optical isolator, characterized in that: The invention comprises a coaxially arranged shell, a copper pipe, a magnetic ring and a PBS prism, wherein there are two PBS prisms, the shell is arranged between the two PBS prisms, the two ends of the shell are provided with a first mounting groove and a second mounting groove which are connected to each other, the magnetic ring is arranged in the second mounting groove and abuts against an end of the second mounting groove close to the first mounting groove, the copper pipe comprises a sliding part and a connecting part, the sliding part can be movably arranged in the first mounting groove along the length direction of the first mounting groove, a TGG crystal is arranged at one end of the connecting part away from the sliding part, and the TGG crystal is at least partially located in the magnetic ring.
2. The wavelength-tunable optical isolator according to claim 1, characterized in that: The inner wall of the first installation groove is provided with an internal thread, the outer wall of the sliding connection portion is provided with an external thread, and the internal thread matches the external thread.
3. The wavelength-tunable optical isolator according to claim 1, characterized in that: A first threaded hole is disposed on the outer wall of the first mounting groove, a first set screw is disposed in the first threaded hole, and the first set screw abuts against the outer wall of the sliding portion.
4. The wavelength-tunable optical isolator according to claim 1, characterized in that: A mirror cover and a pressure ring are also provided in the second mounting groove, and the mirror cover is arranged at an end away from the first mounting groove, the pressure ring is arranged between the magnetic ring and the mirror cover, a second threaded hole is provided on the mirror cover, a second fixing screw is provided in the second threaded hole, and the second fixing screw is abutted against the pressure ring.
5. The wavelength-tunable optical isolator according to claim 4, characterized in that: The two PBS prisms are respectively a first PBS prism and a second PBS prism. A PBS bracket is provided on the lens cover. A first mounting hole is provided in the PBS bracket. The first PBS prism is provided in the first mounting hole.
6. The wavelength-tunable optical isolator according to claim 5, characterized in that: A third mounting groove connected to the first mounting groove is provided at one end of the interior of the shell away from the second mounting groove, the diameter of the third mounting groove is larger than the first mounting groove, a mounting frame is detachably provided in the third mounting groove, the second PBS prism is provided in the mounting frame, and an optical path escape port connected to the second PBS prism is provided on the outer wall of the mounting frame.
7. The wavelength-tunable optical isolator according to claim 6, characterized in that: The mounting frame includes a connecting portion and a mounting portion connected to each other, the connecting portion is detachably connected to the third mounting groove, a second mounting hole is provided in the mounting portion, the second PBS prism is arranged in the second mounting hole, and the optical path escape port is connected to the second mounting hole.
8. The wavelength-tunable optical isolator according to claim 7, characterized in that: The outer wall of the mounting portion is rotatably sleeved with a ring for opening or closing the optical path escape port.
9. The wavelength-tunable optical isolator according to any one of claims 1 to 5, characterized in that: The first mounting slot is connected to the second mounting slot via a limiting hole, and the connecting portion is inserted into the limiting hole.
10. The wavelength-tunable optical isolator according to any one of claims 1 to 5, characterized in that: The outer wall of the shell is sleeved with a bracket.