CN219643294U - Optical fiber coupling adjusting system - Google Patents
Optical fiber coupling adjusting system Download PDFInfo
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- CN219643294U CN219643294U CN202320311461.5U CN202320311461U CN219643294U CN 219643294 U CN219643294 U CN 219643294U CN 202320311461 U CN202320311461 U CN 202320311461U CN 219643294 U CN219643294 U CN 219643294U
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- 230000008878 coupling Effects 0.000 title claims abstract description 193
- 238000010168 coupling process Methods 0.000 title claims abstract description 193
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 193
- 239000013307 optical fiber Substances 0.000 title claims abstract description 128
- 238000003825 pressing Methods 0.000 claims description 45
- 239000000835 fiber Substances 0.000 claims description 16
- 239000013078 crystal Substances 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 9
- 238000005086 pumping Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model provides an optical fiber coupling adjusting system, which comprises a laser assembly, a laser reflector group, an optical fiber coupling assembly, an optical fiber, a point light source and a light sensing element, wherein the laser reflector group is arranged on the optical fiber coupling assembly; the optical fiber coupling assembly comprises a coupling mirror, an optical fiber slot and a coupling adjusting piece, wherein the laser mirror group is used for adjusting the position of a laser light path, so that the laser light path is led into the center of the coupling mirror, and the point light source is fixedly arranged at the output end of the optical fiber. According to the utility model, light is guided into the laser assembly from the point light source at the output end of the optical fiber, the observation light spot is changed along with the movement of the optical fiber in the optical fiber slot of the optical fiber coupling seat to adjust the laser reflecting mirror group so that the optical axis of the light beam coincides with the central axis of the optical fiber, meanwhile, the change rule of the size of the observation light spot is observed to judge whether the light passes through the focus, the specific coupling position of the actual laser is obtained according to the result, the optimal coupling efficiency of the multi-dimensional large-breadth light beam is obtained, the operation time is fast, and the coupling of 200um optical fiber can reach more than 90% when the focus is in the order of 50 um.
Description
Technical Field
The utility model belongs to the technical field of optics, and particularly relates to an optical fiber coupling adjusting system.
Background
The pumping mode of the solid laser mainly comprises two modes of lamp pumping and LD pumping. The solid state laser of LD pumping is usually used for continuous or quasi-continuous operation, and compared with lamp pumping, LD pumping has advantages of high conversion efficiency, good beam quality, small system volume, long service time, etc. While LD pumping has many advantages, lamp pumped lasers still have an irreplaceable role. When the lamp pump is used as a free oscillation pulse laser, the pump power of more than 105W can be achieved in an oscillation period of 10 mu s; if LD pumping is used, a diode group of 104 to 105 unit diodes is required, which is difficult to achieve. In the aspect of material processing (such as laser welding, punching, cutting, quenching and annealing) using a free oscillation pulse laser as an application, the laser processing has the advantages of non-contact, high speed, high efficiency, small heat affected zone and the like, and has very high application prospect, and the lamp pumped laser with high peak power and high pulse energy can be just suitable for the application fields.
However, in the traditional lamp pump laser, the quality of the light beam output by the laser crystal bar is poor, the divergence angle and the light beam breadth of the light beam are large, and the light beam offset of different resonant cavity systems is discrete, in the existing general debugging process, the CCD is placed at the optical fiber output port to observe the output light spot and the power meter to observe the output power, and the existing adjusting process only has power change reference, and the adjustment has no specific basis and definite adjusting direction; at the same time, it is difficult to find a stable coupling point for focus changes caused by different coupling fiber core diameters (200, 400, 600) and different operating conditions (continuous and pulsed).
Disclosure of Invention
The utility model aims to provide an optical fiber coupling adjusting system which can at least solve part of defects in the prior art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an optical fiber coupling adjusting system comprises a laser component, a laser reflector group, an optical fiber coupling component, an optical fiber and a point light source, wherein the laser reflector group, the optical fiber coupling component, the optical fiber and the point light source are sequentially arranged in a laser light path emitted by the laser component; the optical fiber coupling assembly comprises a coupling mirror, an optical fiber slot for inserting an optical fiber input end and enabling an optical fiber to slide along the axis of the optical fiber slot, and a coupling adjusting piece for adjusting the distance between the coupling mirror and the optical fiber, wherein the laser reflecting mirror group is used for adjusting the position of a laser light path, enabling the laser light path to be led into the center of the coupling mirror, the point light source is fixedly arranged at the output end of the optical fiber, and one side of the laser assembly is also provided with a light sensing element for monitoring the center position of a light spot of the point light source in the laser assembly.
Further, the laser assembly comprises a laser crystal and a laser resonant cavity, the light sensing element is located on one side of the laser resonant cavity, and the light sensing element focuses on the surface of the laser crystal.
Further, the laser mirror group includes a pair of total reflection mirrors arranged in parallel.
Further, the optical fiber coupling assembly comprises a coupling seat main body, a coupling mirror, an optical fiber slot and a coupling adjusting piece, wherein the coupling adjusting piece comprises a coupling seat bottom cover, a coupling mirror front pressing block and a coupling mirror rear pressing block, the coupling mirror is arranged between the coupling mirror front pressing block and the coupling mirror rear pressing block, the coupling seat bottom cover is in threaded connection with the coupling seat main body and tightly presses the coupling mirror front pressing block, the coupling mirror and the coupling mirror rear pressing block, the thickness of the coupling mirror rear pressing block is adjustable, and the distance between the coupling mirror and the optical fiber end face is adjusted through the coupling mirror rear pressing blocks with different thicknesses.
Further, the coupling adjusting piece further comprises an adjusting washer, the thickness of the adjusting washer is adjustable, an optical fiber locking piece used for locking the optical fiber and the optical fiber slot is sleeved outside the optical fiber, the adjusting washer is arranged between the optical fiber slot and the optical fiber locking piece, and the distance between the coupling mirror and the end face of the optical fiber is adjusted through the adjusting washers with different thicknesses.
Furthermore, a light hole which can output the size of the light breadth is formed in the center of the coupling seat bottom cover.
Furthermore, the coupling mirror is a biconvex aspheric mirror, and the focal point of the coupling mirror is positioned in the range of the cooperation of the optical fiber and the rear pressing block of the coupling mirror.
Furthermore, one side of the coupling mirror front pressing block, which is close to the coupling mirror, is provided with an annular curved surface groove matched with the convex surface of the coupling mirror.
Further, the light sensing element comprises a CCD camera and a monitor, and the CCD camera is connected with the monitor.
Furthermore, the optical fiber coupling adjusting system further comprises a processor module, wherein the processor module is used for replacing the point-like light source wavelength with the internal working environment and the working wavelength of the laser component to calculate the axial difference of the focal point of the coupling mirror.
Compared with the prior art, the utility model has the beneficial effects that:
according to the optical fiber coupling adjusting system, light is guided into the laser component through the point light source at the output end of the optical fiber, the observation light spots move along with the optical fiber in the optical fiber slot of the optical fiber coupling seat to change and adjust the laser reflecting mirror group so that the optical axis of the light beam coincides with the central axis of the optical fiber, meanwhile, the change rule of the size of the observation light spots judges whether the light passes through the focus, the specific coupling position of the actual laser is obtained according to the result, the optimal coupling efficiency of the multi-dimensional large-breadth light beam is obtained, the operation time is quick, and the coupling of 200um optical fiber can reach more than 90% when the focus is in the order of 50 um.
The present utility model will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the optical architecture of a fiber optic coupling adjustment system of the present utility model;
fig. 2 is a schematic structural view of a fiber coupling assembly in the fiber coupling adjustment system of the present utility model.
Reference numerals illustrate: 1. a light sensing element; 2. a laser assembly; 3. a laser mirror group; 4. an optical fiber coupling assembly; 5. an optical fiber; 6. a point light source; 7. a coupling seat body; 8. a coupling base bottom cover; 9. a pressing block in front of the coupling mirror; 10. a coupling mirror; 11. a pressing block is arranged behind the coupling mirror; 12. an optical fiber slot; 13. an adjusting washer; 14. an optical fiber end face; 15. an optical fiber locking member.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, 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, for example, fixedly connected, detachably connected, or by an abutting connection or integrally connected; the specific meaning of the above terms in the present utility model will be understood in detail by those skilled in the art; in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
The embodiment mainly aims at solving the problem that when the quality of a light beam is not controlled by a lamp pump laser, due to the fact that the vertical axis direction of the output light beam of a resonator is discrete, a machine is difficult to debug to the optimal coupling efficiency due to the difference of working thermal effect focal lengths of the laser, and as shown in fig. 1 and 2, the embodiment provides an optical fiber coupling adjusting system which comprises a laser component 2, and a laser reflector group 3, an optical fiber coupling component 4, an optical fiber 5 and a point light source 6 which are sequentially arranged in a laser light path emitted by the laser component 2. The laser component 2 is an optical combination for outputting laser with a specific wavelength, and in this embodiment, a lamp pump laser is adopted, including a laser crystal, a laser resonant cavity, a Q-switching device, etc., and the specific structure thereof is the prior art, and is not described herein again; the laser reflector group 3 is a reflector for reflecting the specific wavelength output by the laser component 2, and is arranged behind the laser component 2 and used for adjusting the laser ray position; the optical fiber coupling assembly 4 receives the laser light adjusted by the laser reflector group 3, and comprises a coupling mirror 10, an optical fiber slot 12 and a coupling adjusting piece, wherein the laser reflector group 3 leads the laser light path to be roughly adjusted to the position near the center of the coupling mirror 10, the input end of the optical fiber 5 is inserted into the optical fiber slot 12, the optical fiber 5 can slide back and forth along the axis of the optical fiber slot 12, and the coupling adjusting piece is used for adjusting the distance between the coupling mirror 10 and the optical fiber 5; the point light source 6 is fixedly arranged at the output end of the optical fiber 5, and one side of the laser component 2 is also provided with the optical sensing element 1 for monitoring the central position of a light spot of the point light source 6 in the laser component 2.
In this embodiment, the laser mirror group 3 employs a pair of total mirrors arranged in parallel, the relative positions between the two total mirrors are unchanged, and the installation angle of the total mirrors is adjustable, so that incident light at any angle can be received, and the large-format light beam incident into the optical fiber coupling assembly 4 is adjusted to be consistent with the axial direction of the inserted optical fiber. The light sensing element 1 comprises a CCD camera and a monitor, the CCD camera being directed towards the laser crystal in the laser assembly 2 and connected to the monitor.
In a refined embodiment, as shown in fig. 2, the optical fiber coupling assembly 4 includes a coupling seat body 7, a coupling mirror 10, an optical fiber slot 12, and a coupling adjuster. Wherein, the coupling mirror 10 and the coupling adjusting piece are arranged on the coupling seat main body 7, and the optical fiber slot 12 is connected with one end of the coupling seat main body 7 close to the optical fiber 5; the coupling adjusting piece comprises a coupling base cover 8, a coupling mirror front pressing block 9 and a coupling mirror rear pressing block 11, the coupling mirror 10 is arranged between the coupling mirror front pressing block 9 and the coupling mirror rear pressing block 11, the coupling mirror 10 adopts a biconvex aspheric mirror, and the focal point of the coupling mirror 10 is positioned in the range where the optical fiber 5 is matched with the coupling mirror rear pressing block 11; the coupling seat bottom cover 8 is in threaded connection with the coupling seat main body 7 and compresses a coupling mirror front pressing block 9, a coupling mirror 10 and a coupling mirror rear pressing block 11; optimally, one side, close to the coupling mirror 10, of the coupling mirror front pressing block 9 is provided with an annular curved surface groove matched with the convex surface of the coupling mirror 10, so that the coupling mirror front pressing block 9 can better limit and fix the front of the coupling mirror 10. The rear pressing block 11 of the coupling mirror can be designed into a series of cushion blocks with the thickness interval of 0.1mm, the distance between the coupling mirror 10 and the optical fiber end face 14 is quantitatively adjusted by replacing the rear pressing block 11 of the coupling mirror with different thicknesses, and particularly, when the thickness of the rear pressing block 11 of the coupling mirror is increased, the installation position of the rear pressing block 11 of the coupling mirror, which is close to one side of the optical fiber, is fixed, so that the installation position of the coupling mirror 10 moves towards one side of the coupling seat bottom cover 8, and the coupling seat bottom cover 8 pushes the front pressing block 9 of the coupling mirror to press the front of the coupling mirror 10 through threaded adjustment, thereby increasing the distance between the coupling mirror 10 and the optical fiber end face 14 in a quantitative mode, and conversely, reducing the distance between the coupling mirror 10 and the optical fiber end face 14 can be adjusted.
In order to facilitate adjustment, an adjusting washer 13 may be further disposed between the end of the optical fiber slot 12 and the optical fiber 5, and the adjusting washer 13 controls the depth of the optical fiber 5 inserted into the optical fiber slot 12, so as to adjust the distance between the coupling mirror 10 and the optical fiber end face 14. Specifically, the adjusting washer 13 may be designed as a series of washers with thickness intervals of 0.1mm, such as 0.5mm, 0.6mm,..once, 1.5mm, etc., and the distance between the coupling mirror 10 and the fiber end face 14 is quantitatively adjusted by replacing the adjusting washers 13 with different thicknesses; the distance between the coupling mirror 10 and the optical fiber end face 14 is determined by the coupling mirror back pressing block 11 and the adjusting washer 13, and the thickness of the coupling mirror back pressing block 11 or the adjusting washer 13 can be independently adjusted, or the thickness of the coupling mirror back pressing block 11 and the adjusting washer 13 can be simultaneously adjusted. After the adjustment is completed, for the fixation between the optical fiber slot 12 and the optical fiber 5, an optical fiber locking member 15 may be sleeved outside the optical fiber 5, and the adjusting washer 13 is disposed between the optical fiber slot 12 and the optical fiber locking member 15, where the optical fiber locking member 15 is respectively connected with the optical fiber slot 12 and the optical fiber 5 through threads.
During coupling adjustment, the CCD camera and the monitor of the optical sensing element 1 observe the spot shape of the point light source 6 on one side of the laser crystal total reflection mirror in the laser component 2, and the optical fiber locking piece 15 is properly loosened, so that the optical fiber 5 can slide back and forth in the optical fiber slot 12, the change condition of the spot is observed, at the moment, the size and the central position of the spot can be changed, and at the moment, the laser reflection mirror group 3 is adjusted, so that the central position of the spot is not changed along with the movement of the optical fiber 5 in the optical fiber slot 12, namely, the optical axis light is consistent with the optical fiber main shaft.
The center of the coupling base cover 8 is provided with a light hole with the size of the output light breadth to act as a diaphragm, the diaphragm can be expressed in a form of an aperture in a CCD camera, meanwhile, as the two total reflectors of the laser reflector group 3 have a certain thickness, the reflected light spots are displayed as two light spots with slight differences of brightness in the CCD camera, when the distance between the two light spots changes to a certain rule according to the analysis of a light path diagram, the distance reaches the position near the Rayleigh length of the focal point of the coupling mirror 10, and the position of the coupling mirror 10 relative to the focal point of the point light source 6 can be considered to be found. Specifically, by controlling the thickness of the adjusting washer 13, the distance between the fiber end face 14 and the coupling mirror 10 can be quantitatively changed until the focal position of the coupling mirror 10 relative to the point light source 6 is found, and then the optimal coupling efficiency position of the coupling mirror 10 corresponding to the wavelength of the point light source 6 can be calculated by knowing the focal position and the diameter of the fiber end face 14 according to the actual situation.
The optical fiber coupling adjusting system of the embodiment further comprises a processor module for replacing the wavelength of the point-like light source 6 with the working environment and the working wavelength inside the laser assembly 2 to calculate the axial difference of the focal point of the coupling mirror. Specifically, after the optimal coupling and efficiency positions of the coupling mirror 10 corresponding to the wavelength of the point light source 6 are found, the outgoing light wavelength of the point light source 6, the coupling mirror back pressing block 11 and the thickness data of the adjusting gasket 13 are input into a processor module (zemax simulation is taken as an example in the embodiment), and meanwhile, the thickness of the coupling mirror back pressing block 11 actually required can be obtained through conversion by inputting information of working environment (temperature and air pressure) and wavelength; and then according to the calculated thickness of the coupling mirror back pressing block 11, placing the coupling mirror back pressing block 11 with the corresponding thickness, taking out the adjusting washer 13, locking the optical fiber 6 and the optical fiber slot 12 by the optical fiber locking piece 15, and testing to obtain the optimal coupling efficiency.
In addition, in this embodiment, the image of the monitor is adjusted by matching the coupling mirror rear pressing block 11 and the adjusting washer 13 with manual work, and in other embodiments, the whole adjusting system is changed into an automatic focusing debugging system by image recognition and changing the thickness adjustment of the coupling mirror rear pressing block and the adjusting washer into a stepping motor and a guide rail, so that the efficiency and the stability are further improved.
The optical fiber coupling adjusting system provided by the embodiment has specific image and formula basis, a CCD camera is arranged in front of a crystal to observe light spots of a point light source reversely incident from an optical fiber, a high-power large-breadth laser beam in any direction obtained by a laser component is measured and calculated by an analog system, the vertical plane position of an optical axis and the focal point position of the optical axis are adjusted to be coupled into a small-core-diameter optical fiber, and the coupling efficiency is ensured to be more than 90%; in practical experiments, a beam with a width of about 6mm-10mm can be coupled into a 200um aperture optical fiber, and the coupling efficiency is maintained to be more than 90% within 0-50W.
The foregoing examples are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model, and all designs that are the same or similar to the present utility model are within the scope of the present utility model.
Claims (10)
1. An optical fiber coupling adjustment system, characterized in that: the laser comprises a laser component, a laser reflector group, an optical fiber coupling component, an optical fiber and a point light source, wherein the laser reflector group, the optical fiber coupling component, the optical fiber and the point light source are sequentially arranged in a laser light path emitted by the laser component; the optical fiber coupling assembly comprises a coupling mirror, an optical fiber slot for inserting an optical fiber input end and enabling an optical fiber to slide along the axis of the optical fiber slot, and a coupling adjusting piece for adjusting the distance between the coupling mirror and the optical fiber, wherein the laser reflecting mirror group is used for adjusting the position of a laser light path, enabling the laser light path to be led into the center of the coupling mirror, the point light source is fixedly arranged at the output end of the optical fiber, and one side of the laser assembly is also provided with a light sensing element for monitoring the center position of a light spot of the point light source in the laser assembly.
2. The fiber coupling adjustment system of claim 1, wherein: the laser assembly comprises a laser crystal and a laser resonant cavity, the light sensing element is positioned on one side of the laser resonant cavity, and the light sensing element focuses on the surface of the laser crystal.
3. The fiber coupling adjustment system of claim 1, wherein: the laser mirror group includes a pair of total reflection mirrors arranged in parallel.
4. The fiber coupling adjustment system of claim 1, wherein: the optical fiber coupling assembly comprises a coupling seat main body, a coupling mirror, an optical fiber slot and a coupling adjusting piece, wherein the coupling adjusting piece comprises a coupling seat bottom cover, a coupling mirror front pressing block and a coupling mirror rear pressing block, the coupling mirror is arranged between the coupling mirror front pressing block and the coupling mirror rear pressing block, the coupling seat bottom cover is in threaded connection with the coupling seat main body and tightly presses the coupling mirror front pressing block, the coupling mirror and the coupling mirror rear pressing block, the thickness of the coupling mirror rear pressing block is adjustable, and the distance between the coupling mirror and the optical fiber end face is adjusted through the coupling mirror rear pressing blocks with different thicknesses.
5. The fiber coupling adjustment system of claim 4, wherein: the coupling adjusting piece further comprises an adjusting washer, the thickness of the adjusting washer is adjustable, an optical fiber locking piece used for locking the optical fiber and the optical fiber slot is sleeved outside the optical fiber, the adjusting washer is arranged between the optical fiber slot and the optical fiber locking piece, and the distance between the coupling mirror and the end face of the optical fiber is adjusted through the adjusting washers with different thicknesses.
6. The fiber coupling adjustment system of claim 4, wherein: and a light hole which can output the size of the light breadth is formed in the center of the bottom cover of the coupling seat.
7. The fiber coupling adjustment system of claim 4, wherein: the coupling mirror is a biconvex aspheric mirror, and the focal point of the coupling mirror is positioned in the range where the optical fiber is matched with the rear pressing block of the coupling mirror.
8. The fiber coupling adjustment system of claim 7, wherein: the coupling mirror front pressing block is provided with an annular curved surface groove matched with the convex surface of the coupling mirror at one side close to the coupling mirror.
9. The fiber coupling adjustment system of claim 1, wherein: the light sensing element comprises a CCD camera and a monitor, and the CCD camera is connected with the monitor.
10. The fiber coupling adjustment system of claim 1, wherein: the device also comprises a processor module for carrying out replacement calculation on the axial difference of the focal point of the coupling mirror between the punctiform light source wavelength and the internal working environment and the working wavelength of the laser component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320311461.5U CN219643294U (en) | 2023-02-24 | 2023-02-24 | Optical fiber coupling adjusting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320311461.5U CN219643294U (en) | 2023-02-24 | 2023-02-24 | Optical fiber coupling adjusting system |
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| CN219643294U true CN219643294U (en) | 2023-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320311461.5U Active CN219643294U (en) | 2023-02-24 | 2023-02-24 | Optical fiber coupling adjusting system |
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- 2023-02-24 CN CN202320311461.5U patent/CN219643294U/en active Active
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