CN111458802B - Light beam coupling device and coupling method thereof - Google Patents
Light beam coupling device and coupling method thereof Download PDFInfo
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- CN111458802B CN111458802B CN202010374087.4A CN202010374087A CN111458802B CN 111458802 B CN111458802 B CN 111458802B CN 202010374087 A CN202010374087 A CN 202010374087A CN 111458802 B CN111458802 B CN 111458802B
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- 238000010168 coupling process Methods 0.000 title claims abstract description 101
- 230000008878 coupling Effects 0.000 title claims abstract description 90
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 90
- 238000001816 cooling Methods 0.000 claims abstract description 108
- 239000013307 optical fiber Substances 0.000 claims abstract description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 230000005540 biological transmission Effects 0.000 claims abstract description 46
- 238000007789 sealing Methods 0.000 claims description 28
- 239000000835 fiber Substances 0.000 claims description 16
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 abstract 1
- 239000000498 cooling water Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000013021 overheating Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention relates to the technical field of laser application and discloses a light beam coupling device and a coupling method thereof, wherein the light beam coupling device comprises a fixed sleeve, an optical fiber interface, a lens barrel and a coupling lens which are coaxially arranged, the optical fiber interface is arranged at a first end of the fixed sleeve, and the lens barrel is adjustably arranged in the fixed sleeve; the device also comprises a water cooling structure and/or an elastic pre-tightening structure; the water cooling structure is arranged on the side wall of the lens cone; one end of the lens barrel, which is far away from the optical fiber interface, is connected with the second end of the fixed sleeve through an elastic pre-tightening structure; the invention not only eliminates the influence of the coupling lens on the light beam coupling caused by overheat deformation through the water cooling structure, but also greatly reduces the assembly error of the device through the elastic pre-tightening structure, ensures the reliability of the light beam coupling based on the real-time monitoring of the light beam coupling state by the photosensitive element, and effectively prevents the damage to the transmission optical fiber caused by the position deviation of the focusing light spot during the continuous output of high-power laser.
Description
Technical Field
The invention relates to the technical field of laser application, in particular to a light beam coupling device and a coupling method thereof.
Background
In a multi-optical-path transmission system, collimated light beams are coupled by a light beam coupling device and reach a processing position after entering different transmission optical fibers, so that laser coupling for realizing space transmission is transmitted in the optical fibers. Compared with a direct output laser, the light beam coupling device transmits energy through a flexible integrated optical fiber, and is easier to operate and apply.
The coupling principle of the beam coupling device for the laser beam is that the collimated beam is focused in the range of the fiber core of the end face of the transmission fiber, so that the beam coupling device mainly structurally comprises a fixed sleeve, a fiber interface, a lens barrel and a coupling lens which are coaxially arranged, wherein the fiber interface is arranged at one end of the fixed sleeve, the coupling lens is arranged in the lens barrel, and the lens barrel is adjustably arranged in the fixed sleeve.
Currently, the beam coupling device on the market is usually of a natural cooling structure, in a low-power transmission system, the position deviation of a focusing light spot caused by processing and assembling errors does not damage a transmission optical fiber, in a high-power system, besides the processing and assembling errors, as the high-power laser is continuously output, the coupling lens generates larger temperature rise, the deformation of the coupling lens caused by absorbing excessive heat also causes the position deviation of the focusing light spot, so that the reliability of beam coupling is greatly affected, and the optical fiber is damaged.
Disclosure of Invention
The embodiment of the invention provides a light beam coupling device which is used for at least solving the problem that the reliability of light beam coupling is affected by assembly errors or deformation of a coupling lens caused by overheating in the existing light beam coupling device.
The embodiment of the invention also provides a coupling method based on the light beam coupling device.
In order to solve the above technical problems, an aspect of the embodiments of the present invention provides a light beam coupling device, including a fixed sleeve, an optical fiber interface, a lens barrel and a coupling lens coaxially arranged, where the optical fiber interface is mounted at a first end of the fixed sleeve, and the lens barrel is adjustably mounted in the fixed sleeve; further comprises: a water cooling structure and/or an elastic pre-tightening structure; the water cooling structure is arranged on the side wall of the lens cone; one end of the lens barrel, which is far away from the optical fiber interface, is connected with the second end of the fixed sleeve through the elastic pre-tightening structure.
The lens cone comprises a first lens cone section far away from the optical fiber interface, the water cooling structure comprises a cooling flow channel arranged on the outer side wall of the first lens cone section, the coupling lens is arranged in the first lens cone section, the outer side wall of the first lens cone section is sleeved with a cooling sleeve used for sealing the cooling flow channel, and the outer side wall of the cooling sleeve is in sliding connection with the inner side wall of the fixed sleeve; the elastic pre-tightening structure comprises a pre-tightening spring, the cooling sleeve and one end of the first lens barrel section, which is far away from the optical fiber interface, are abutted against one end of the pre-tightening spring together, and the other end of the pre-tightening spring is abutted against the second end of the fixing sleeve.
The optical fiber connector comprises a lens barrel, a fixing sleeve, a photosensitive element and an optical fiber connector, wherein the photosensitive element is further arranged in the fixing sleeve, and the photosensitive element is close to one end of the optical fiber connector, which faces the lens barrel.
The middle part of the fixed sleeve is rotated to be provided with a rotating member coaxially arranged with the fixed sleeve, the lens barrel comprises a second lens barrel section close to the optical fiber interface, and the rotating member is in threaded connection with the outer side wall of the second lens barrel section.
The optical fiber connector comprises a first lens cone section, a second lens cone section, a pre-tightening spring, an annular clamping groove, an annular adjusting member and a fixing sleeve, wherein the annular clamping groove is formed in one end of the cooling sleeve, which is far away from the optical fiber connector, of the first lens cone section, the annular clamping groove is arranged along the axial direction of the lens cone, one end of the pre-tightening spring stretches into the annular clamping groove, the other end of the pre-tightening spring is abutted to the annular adjusting member, and the annular adjusting member is in threaded connection with the second end of the fixing sleeve.
The fixing sleeve comprises a first fixing sleeve and a second fixing sleeve which are coaxially connected; the rotary member comprises an adjusting screw ring which is rotatably arranged between the first fixed sleeve and the second fixed sleeve, and the adjusting screw ring is in threaded connection with the outer side wall of the second lens barrel section; the optical fiber connector is arranged in the first fixed sleeve, and the inner side wall of the second fixed sleeve is in sliding connection with the outer side wall of the cooling sleeve.
The second fixing sleeve is provided with a first window, the outer side wall of the cooling sleeve is provided with scale marks which are axially distributed along the cooling sleeve, and the scale marks correspond to the first window.
The second window is formed in the second fixing sleeve, a water inlet joint and a water outlet joint are arranged on the outer side wall of the cooling sleeve, the water inlet joint is communicated with one end of the cooling flow passage, the other end of the cooling flow passage is communicated with the water outlet joint, and the water inlet joint and the water outlet joint are respectively corresponding to the second window.
The cooling device comprises a first lens barrel section, a cooling sleeve and a cooling flow passage, wherein a first sealing structure and a second sealing structure are arranged between two ends of the first lens barrel section and the inner side wall of the cooling sleeve, the cooling flow passage is located between the first sealing structure and the second sealing structure, and the cooling flow passage is arranged in a serpentine shape.
In another aspect, the embodiment of the present invention further provides a coupling method based on the beam coupling device described above, including: s1, inserting a transmission optical fiber into an optical fiber interface, and connecting a water cooling structure with a water cooling device; s2, the laser beam is incident into the lens barrel from the second end of the fixed sleeve, and the axial position of the lens barrel relative to the fixed sleeve is adjusted based on the optical signal, which is collected in real time by the photosensitive element and is scattered on the end face of the transmission optical fiber, of the focusing light spot passing through the coupling lens until the focusing light spot is positioned in the end face of the transmission optical fiber and coincides with the fiber core of the transmission optical fiber.
The above technical solutions in the embodiments of the present invention have at least one of the following technical effects:
according to the beam coupling device provided by the embodiment of the invention, through the water cooling structure arranged on the side wall of the lens barrel, the deviation of the position of the focusing light spot caused by deformation of the coupling lens due to excessive heat absorption during continuous output of high-power laser is effectively prevented, meanwhile, the lens barrel can be accurately adjusted to the preset position based on the pretightening force provided by the elastic pretightening structure on the lens barrel, so that the position of the focusing light spot is accurately concentrated on the end face of the transmission optical fiber, the assembly error of the coupling device is effectively reduced, the reliability of beam coupling is ensured, and the damage to the transmission optical fiber caused by the position deviation of the focusing light spot during continuous output of the high-power laser can be further prevented.
According to the coupling method based on the light beam coupling device, when light beam coupling is carried out, the optical signals which are collected in real time and are scattered on the end face of the transmission optical fiber by the focusing light spot of the coupling lens based on the photosensitive element are used for adjusting the axial position of the lens barrel relative to the fixed sleeve, namely, the position of the focusing light spot which is passed through the coupling lens on the end face of the transmission optical fiber is adjusted until the focusing light spot is positioned in the end face of the transmission optical fiber and coincides with the fiber core of the transmission optical fiber, so that the accurate adjustment of the coupling state of the laser beam is achieved, the position of the coupled focusing light spot is always positioned in the end face of the transmission optical fiber and coincides with the fiber core of the transmission optical fiber based on the pretension effect of the elastic pretension structure on the basis of ensuring that the coupling lens cannot deform due to overheating, and the coupling state of the focusing light spot can be monitored in real time by the photosensitive element, and damage to the transmission optical fiber due to the deviation of the position of the focusing light spot is prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic plan sectional view of a beam coupling device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a three-dimensional cross-sectional structure of a beam coupling device according to an embodiment of the present invention;
FIG. 3 is a schematic perspective view of a beam coupling device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a light beam coupling device for coupling light beams according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a lens barrel according to an embodiment of the present invention;
FIG. 6 is a schematic view showing a planar development of a cooling flow passage according to an embodiment of the present invention;
fig. 7 is a flowchart of a coupling method based on a beam coupling device according to an embodiment of the present invention.
In the figure, 1, a first fixing sleeve; 2. a second fixed sleeve; 3. adjusting the spiral ring; 4. an optical fiber interface; 5. a transmission optical fiber; 6. a lens barrel; 61. a first barrel section; 62. a second barrel section; 7. a coupling lens; 8. a cooling flow passage; 9. cooling the sleeve; 10. a first sealing structure; 11. a second sealing structure; 12. a pre-tightening spring; 13. an annular adjusting member; 14. a photosensitive element; 15. a first window; 16. a second window; 17. a water inlet joint; 18. and a water outlet joint.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1 to 3, the present embodiment provides a light beam coupling device, which includes a fixed sleeve, an optical fiber interface 4, a lens barrel 6 and a coupling lens 7 coaxially arranged, wherein the optical fiber interface 4 is mounted at a first end of the fixed sleeve, the lens barrel 6 is adjustably mounted in the fixed sleeve, and the coupling lens 7 is mounted in the lens barrel 6; the device also comprises a water cooling structure and/or an elastic pre-tightening structure; the water cooling structure is arranged on the side wall of the lens barrel 6; one end of the lens barrel 6 far away from the optical fiber interface 4 is connected with the second end of the fixed sleeve through an elastic pre-tightening structure.
Specifically, in the beam coupling device shown in this embodiment, through the water cooling structure disposed on the side wall of the lens barrel 6, indirect cooling of the coupling lens 7 can be achieved based on water cooling of the water cooling structure on the lens barrel 6, so that when high-power laser is continuously output, deviation of the position of the focusing light spot caused by deformation of the coupling lens 7 due to excessive heat absorption is effectively prevented, meanwhile, the lens barrel 6 can be accurately adjusted to a preset position based on the pretightening force provided by the elastic pretightening structure on the lens barrel 6, so that the position of the focusing light spot is accurately concentrated on the end face of the transmission optical fiber 5, assembly errors existing in the coupling device are effectively reduced, reliability of beam coupling is ensured, and damage to the transmission optical fiber 5 due to the position deviation of the focusing light spot during continuous output of the high-power laser can be further prevented.
It should be noted that, the water cooling structure is used for being connected with an external water cooling device, and the water cooling device can be a water cooling device known in the art, and cooling of the side wall of the lens barrel 6 is achieved by introducing circulating cooling water into the water cooling structure, so that based on the conduction effect of the lens barrel 6 on cooling water cooling capacity, the coupling lens 7 in the lens barrel 6 can keep a proper temperature, and deviation of the position of a focusing spot caused by deformation of the coupling lens 7 due to excessive heat absorption during coupling of laser continuously output by high-power laser can be effectively prevented, wherein the water cooling structure can be understood as a sandwich structure or a runner structure known in the art for heat exchange of cooling water, which is not particularly limited.
Meanwhile, for the existing beam coupling device, when the axial position of the lens barrel relative to the fixed sleeve is adjusted to focus the laser light spot, due to the existence of assembly errors, the lens barrel cannot be adjusted to a preset position, so that an elastic pre-tightening structure is further designed on the basis of a water cooling structure, the lens barrel 6 can be accurately adjusted to the preset position based on the pre-tightening force provided by the elastic pre-tightening structure to the lens barrel 6, so that the position of the focused light spot is accurately concentrated on the end face of the transmission optical fiber, and the combined regulation and control effect of the water cooling structure and the elastic pre-tightening structure to the focused light spot is integrated, and the reliability of beam coupling is effectively ensured; the elastic pre-tightening structure may be understood as a spring plate, a spring, an elastic plate, etc. which are known in the art and can provide a pre-tightening force in a directional manner, and is not limited thereto.
The coupling lens 7 is a lens group, and the lens group may be at least one of a spherical lens and an aspherical lens arranged in the same axial direction.
Preferably, as shown in fig. 1 and 5, in the present embodiment, the lens barrel 6 includes a first lens barrel section 61 far away from the optical fiber interface 4, the water cooling structure includes a cooling channel 8 provided on an outer side wall of the first lens barrel section 61, a coupling lens 7 is installed in the first lens barrel section 61, a cooling sleeve 9 for sealing the cooling channel 8 is sleeved on an outer side wall of the first lens barrel section 61, and an outer side wall of the cooling sleeve 9 is slidably connected with an inner side wall of the fixing sleeve; the elastic pre-tightening structure comprises a pre-tightening spring 12, one end of the pre-tightening spring 12 is abutted together with one end of the first lens barrel section 61 away from the optical fiber interface 4, and the other end of the pre-tightening spring 12 is abutted with the second end of the fixing sleeve.
Specifically, in this embodiment, the coupling lens 7 is installed in the first lens barrel section 61, and based on the direct water cooling of the cooling water flowing in the cooling flow channel 8 to the first lens barrel section 61, the cooling capacity can be quickly conducted to the coupling lens 7 under the heat conduction action of the first lens barrel section 61, so that the deviation of the position of the focusing light spot caused by the deformation of the coupling lens 7 due to the absorption of excessive heat during the continuous output of high-power laser is effectively prevented. Wherein, set up cooling flow channel 8 on the outer sidewall of first lens-barrel section 61, can facilitate the processing, and do not occupy too much external space.
As shown in fig. 1, in one preferred embodiment, a first sealing structure 10 and a second sealing structure 11 may be disposed between two ends of the first barrel section 61 and an inner side wall of the cooling sleeve 9, so that the first barrel section 61, the cooling sleeve 9, the first sealing structure 10 and the second sealing structure 11 enclose a closed cavity, and when the cooling flow channel 8 is disposed between the first sealing structure 10 and the second sealing structure 11, cooling water flowing in the cooling flow channel 8 is effectively prevented from flowing out of the closed cavity. The first sealing structure 10 and the second sealing structure 11 have the same structure, and each of the first sealing structure and the second sealing structure comprises an annular sealing groove and an annular sealing ring, the annular sealing grooves are arranged on the outer side wall of the first lens barrel section 61, and the annular sealing rings are embedded in the annular sealing grooves and contact-seal the inner side wall of the cooling sleeve 9.
As shown in fig. 5 and 6, while facilitating the processing of the cooling flow channels 8, in order to facilitate the better distribution of the cooling flow channels 8 in the respective areas on the side wall of the first barrel section 61, the cooling flow channels 8 may preferably be arranged in a serpentine shape, thereby also ensuring the uniformity of the temperature distribution in the respective areas on the side wall of the first barrel section 61 accordingly.
Meanwhile, since the pretensioning spring has good deformation characteristics and self-recovery, and can maintain good coaxiality with the lens barrel 6, no influence is caused on the transmission of the light beam in the lens barrel 6, so that the elastic pretensioning structure is preferably the pretensioning spring 12 in this embodiment. In addition, since the cooling sleeve 9 is sleeved on the outer side wall of the first lens barrel section 61, in order to facilitate the movement of the lens barrel 6 relative to the lens barrel 6 in the fixing sleeve, and to effectively water-cool the lens barrel 6, when the cooling sleeve 9 and one end of the first lens barrel section 61 far from the optical fiber interface 4 are jointly abutted against one end of the pre-tightening spring 12, the other end of the pre-tightening spring 12 is abutted against the second end of the fixing sleeve.
As shown in fig. 1, in another preferred embodiment, an annular clamping groove is formed at one end of the cooling sleeve 9, which is far away from the optical fiber interface 4, and the first lens barrel section 61, the annular clamping groove is arranged along the axial direction of the lens barrel 6, one end of the pre-tightening spring 12 extends into the annular clamping groove, the other end of the pre-tightening spring abuts against the annular adjusting member 13, and the annular adjusting member 13 is in threaded connection with the second end of the fixing sleeve.
Thus, by designing the annular clamping groove, the pretensioning spring 12 can be ensured to be elastically deformed stably under the restriction of the annular clamping groove, and the elastic force of the pretensioning spring 12 can be further adjusted based on the annular adjusting member 13, so that the screw gap occurring when the position of the lens barrel 6 is screw-adjusted as shown in the following embodiment is effectively eliminated, thereby correspondingly improving the accuracy of adjusting the coupling lens 7 and ensuring the stability of the coupling lens 7.
Preferably, as shown in fig. 4, the fixing sleeve is further provided with a photosensitive element 14, and the photosensitive element 14 is near to one end of the optical fiber interface 4 facing the lens barrel 6, wherein the photosensitive element 14 may be a photosensitive diode as known in the art.
Specifically, in operation, the optical fiber interface 4 is internally inserted with the transmission optical fiber 5, and the end face of the transmission optical fiber 5 slightly protrudes from the optical fiber interface 4 toward one end of the lens barrel 6. When the laser beam is coupled, the laser beam is incident into the lens barrel 6 from the second end of the fixed sleeve, the coupling lens 7 in the lens barrel 6 focuses the laser beam, when the focusing light spot is overlarge and exceeds the diameter of the fiber core of the transmission fiber 5, or the focusing light spot deviates from the center of the fiber, the focusing light spot enters the cladding area beyond the range of the fiber core, and strong scattered light can be generated on the end face of the transmission fiber 5, so that the light signal can be sensed by the photosensitive element 14 and transmitted to the control system, and the control system can monitor the coupling state of the laser beam in real time based on the signal collected by the photosensitive element 14.
Preferably, as shown in fig. 1, the middle part of the fixing sleeve is rotated to have a rotation member coaxially arranged therewith, and the lens barrel 6 includes a second lens barrel section 62 near the optical fiber interface 4, and the rotation member is screwed with an outer side wall of the second lens barrel section 62.
Specifically, since the rotating member is screwed to the outer sidewall of the second barrel section 62, the barrel 6 can be stably moved relative to the fixed sleeve and toward the first end or the second end thereof when the rotating member is rotated, thereby facilitating the adjustment of the position of the focused spot passing through the coupling lens 7, being simple and convenient in operation, and having high coaxiality. In order to ensure the stability of the axial movement of the lens barrel 6 with respect to the fixed sleeve, an axial guide structure may be provided between the outer side wall of the lens barrel 6 and the inner side wall of the fixed sleeve.
As shown in fig. 1 and 2, in one preferred embodiment, the fixing sleeve may further comprise a first fixing sleeve 1 and a second fixing sleeve 2 coaxially connected; the rotating member comprises an adjusting screw ring 3, the adjusting screw ring 3 is rotatably arranged between the first fixed sleeve 1 and the second fixed sleeve 2, and the adjusting screw ring 3 is in threaded connection with the outer side wall of the second lens barrel section 62; the optical fiber connector 4 is arranged in the first fixed sleeve 1, and the inner side wall of the second fixed sleeve 2 is in sliding connection with the outer side wall of the cooling sleeve 9.
Preferably, as shown in fig. 1, in this embodiment, the second fixing sleeve 2 is provided with a first window 15, and the outer side wall of the cooling sleeve 9 is provided with scale marks arranged along the axial direction thereof, where the scale marks correspond to the first window 15.
Specifically, in this embodiment, the adjustment of the focal spot position is correspondingly implemented based on the adjustment of the position of the lens barrel 6, and when the lens barrel 6 moves, the cooling sleeve 9 moves together therewith, so that the outer side wall of the cooling sleeve 9 can be provided with scale marks, and the moving distance of the lens barrel 6 is accurately controlled in real time by observing the change of the scale marks in the first window 15, so that the accurate adjustment of the focal spot position is correspondingly achieved.
Preferably, as shown in fig. 3, in this embodiment, a second window 16 is formed on the second fixing sleeve 2, and an inlet connector 17 and an outlet connector 18 are mounted on an outer side wall of the cooling sleeve 9, where the inlet connector 17 and the outlet connector 18 are both arranged along a radial direction of the cooling sleeve 9, the inlet connector 17 is communicated with one end of the cooling flow channel 8, the other end of the cooling flow channel 8 is communicated with the outlet connector 18, and the inlet connector 17 and the outlet connector 18 respectively correspond to the second window 16.
Specifically, the second window 16 in this embodiment is used as a relief port, so that the water inlet connector 17 and the water outlet connector 18 are directly mounted on the outer side wall of the cooling sleeve 9. For the cooling flow channel 8, the row form on the side wall of the first barrel section 61 may be in a serpentine form as shown in fig. 6, so that when the water inlet joint 17 is connected to one end of the cooling flow channel 8 and the other end of the cooling flow channel 8 is connected to the water outlet joint 18, the water inlet joint 17, the cooling flow channel 8 and the water outlet joint 18 can respectively form closed-loop communication with an external circulation pipeline and a water cooling device, so that circulating cooling water is input into the cooling flow channel 8, and continuous water cooling effect on the barrel 6 is realized.
Preferably, as shown in fig. 7, the present embodiment further provides a coupling method based on the beam coupling device described above, including: s1, inserting a transmission optical fiber into an optical fiber interface, and connecting a water cooling structure with a water cooling device; s2, the laser beam is incident into the lens barrel from the second end of the fixed sleeve, and the axial position of the lens barrel relative to the fixed sleeve is adjusted based on the optical signal, which is collected in real time by the photosensitive element and is scattered on the end face of the transmission optical fiber, of the focusing light spot passing through the coupling lens until the focusing light spot is positioned in the end face of the transmission optical fiber and coincides with the fiber core of the transmission optical fiber.
Specifically, in the coupling method provided by the embodiment, when coupling the laser beams, the transmission optical fiber is inserted into the optical fiber interface, the end surface of the transmission optical fiber faces one side of the lens barrel, and corresponds to the photosensitive element in the radial direction, and meanwhile, the water cooling structure is connected with the water cooling device through the circulating pipeline to form a cooling water circulating system, so that the lens barrel is ensured to be cooled through circulating flowing cooling water, and the indirect cooling of the coupling lens is realized.
Then, based on the optical signal scattered by the focusing light spot of the coupling lens on the end face of the transmission optical fiber, which is acquired in real time by the photosensitive element, the axial position of the lens barrel relative to the fixed sleeve is adjusted, namely, the position of the focusing light spot of the coupling lens on the end face of the transmission optical fiber is adjusted until the focusing light spot is positioned in the end face of the transmission optical fiber and coincides with the fiber core of the transmission optical fiber, so that the accurate adjustment of the coupling state of the laser beam is achieved, and on the basis of ensuring that the coupling lens cannot deform due to overheating, the position of the coupled focusing light spot is always positioned in the end face of the transmission optical fiber and coincides with the fiber core of the transmission optical fiber, and the coupling state of the focusing light spot can be monitored in real time by the photosensitive element, so that the damage to the transmission optical fiber due to the deviation of the position of the focusing light spot is prevented.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. The light beam coupling device comprises a fixed sleeve, an optical fiber interface, a lens barrel and a coupling lens which are coaxially arranged, wherein the optical fiber interface is arranged at a first end of the fixed sleeve, and the lens barrel is adjustably arranged in the fixed sleeve; characterized by further comprising: a water cooling structure and an elastic pre-tightening structure; the water cooling structure is arranged on the side wall of the lens cone; one end of the lens barrel, which is far away from the optical fiber interface, is connected with the second end of the fixed sleeve through the elastic pre-tightening structure;
the lens cone comprises a first lens cone section far away from the optical fiber interface, the water cooling structure comprises a cooling flow channel arranged on the outer side wall of the first lens cone section, the coupling lens is arranged in the first lens cone section, the outer side wall of the first lens cone section is sleeved with a cooling sleeve used for sealing the cooling flow channel, and the outer side wall of the cooling sleeve is in sliding connection with the inner side wall of the fixed sleeve;
the elastic pre-tightening structure comprises a pre-tightening spring, the cooling sleeve and one end of the first lens barrel section, which is far away from the optical fiber interface, are jointly abutted against one end of the pre-tightening spring, and the other end of the pre-tightening spring is abutted against the second end of the fixed sleeve;
the middle part of the fixed sleeve is rotatably provided with a rotating member coaxially arranged with the fixed sleeve, the lens barrel comprises a second lens barrel section close to the optical fiber interface, and the rotating member is in threaded connection with the outer side wall of the second lens barrel section;
the fixed sleeve comprises a first fixed sleeve and a second fixed sleeve which are coaxially connected; the rotary member comprises an adjusting screw ring which is rotatably arranged between the first fixed sleeve and the second fixed sleeve, and the adjusting screw ring is in threaded connection with the outer side wall of the second lens barrel section; the optical fiber connector is arranged in the first fixed sleeve, and the inner side wall of the second fixed sleeve is in sliding connection with the outer side wall of the cooling sleeve;
a first window is formed in the second fixed sleeve, scale marks which are axially distributed along the outer side wall of the cooling sleeve are formed in the outer side wall of the cooling sleeve, and the scale marks correspond to the first window;
and a photosensitive element is also arranged in the fixed sleeve, and the photosensitive element is close to one end of the optical fiber interface, which faces the lens barrel.
2. The beam coupling device according to claim 1, wherein an annular clamping groove is formed in one end, away from the optical fiber interface, of the cooling sleeve and the first lens barrel section, the annular clamping groove is arranged along the axial direction of the lens barrel, one end of the pre-tightening spring extends into the annular clamping groove, the other end of the pre-tightening spring abuts against an annular adjusting member, and the annular adjusting member is in threaded connection with the second end of the fixing sleeve.
3. The beam coupling device according to claim 1, wherein a second window is formed in the second fixing sleeve, a water inlet connector and a water outlet connector are mounted on the outer side wall of the cooling sleeve, the water inlet connector is communicated with one end of the cooling flow channel, the other end of the cooling flow channel is communicated with the water outlet connector, and the water inlet connector and the water outlet connector are respectively corresponding to the second window.
4. The beam coupling device of claim 1, wherein a first sealing structure and a second sealing structure are disposed between two ends of the first barrel section and an inner side wall of the cooling sleeve, the cooling flow passage is disposed between the first sealing structure and the second sealing structure, and the shape of the cooling flow passage arrangement comprises a serpentine shape.
5. A coupling method based on the beam coupling device according to any one of claims 1 to 4, comprising:
s1, inserting a transmission optical fiber into an optical fiber interface, and connecting a water cooling structure with a water cooling device;
s2, the laser beam is incident into the lens barrel from the second end of the fixed sleeve, and the axial position of the lens barrel relative to the fixed sleeve is adjusted based on the optical signal, which is collected in real time by the photosensitive element and is scattered on the end face of the transmission optical fiber, of the focusing light spot passing through the coupling lens until the focusing light spot is positioned in the end face of the transmission optical fiber and coincides with the fiber core of the transmission optical fiber.
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