CN218848378U - Multi-path light splitting system for welding quartz end cap - Google Patents
Multi-path light splitting system for welding quartz end cap Download PDFInfo
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- CN218848378U CN218848378U CN202222675264.XU CN202222675264U CN218848378U CN 218848378 U CN218848378 U CN 218848378U CN 202222675264 U CN202222675264 U CN 202222675264U CN 218848378 U CN218848378 U CN 218848378U
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Abstract
The utility model discloses a multichannel beam split system for butt fusion of quartzy end cap, including the beam split light path, the beam split light path includes carbon dioxide laser light source, first beam splitter, first high reflection mirror, second beam splitter, the high reflection mirror of second, the high reflection mirror of third, third beam splitter, the high reflection mirror of fourth, the high reflection mirror of fifth, quartzy end cap, first focusing mirror, second focusing mirror, third focusing mirror and fourth focusing mirror, through the beam split light path falls into four ways light beam with the laser of carbon dioxide laser light source output, assembles quartzy end cap, even heating quartzy end cap butt fusion region through a plurality of focusing mirrors from four directions to realize the butt fusion of quartzy end cap and optic fibre. The light beam is split into four paths and then focused, so that the problem of uneven heating in the welding process of the quartz end cap is solved, the welding quality of the optical fiber and the quartz end cap is improved, and the transmission efficiency is improved.
Description
Technical Field
The utility model relates to a multichannel beam splitting system for quartz end cap butt fusion, especially, relate to and utilize beam splitting system to divide into multichannel light with the light beam and carry out the butt fusion of optic fibre and quartz end cap.
Background
The fiber laser has the advantages of high light-light conversion efficiency, good light beam quality, compact structure, simple and convenient heat dissipation device and the like. However, the continuous increase of laser power also brings about a plurality of problems, and because the core diameter of the double-clad optical fiber is very small, high power density is easily formed on the emergent end face of the optical fiber when high-power laser is transmitted. At high power densities, small end face contamination and processing defects can cause damage to the fiber end face. It is often necessary to fusion splice fiber end caps to the end faces of double-clad fibers to address the damage caused by high power density.
The carbon dioxide laser welding method utilizes the good absorption characteristic of the quartz optical fiber to the carbon dioxide laser to weld the optical fiber, the heat of a heat source is easy to control, the cleanness is high, no pollutant is attached around a welding point, and the optical fiber cannot be burnt due to overhigh melting point temperature during the transmission of high-power laser.
In the optical fiber end cap welding technology, the realization of uniform heating of the quartz end cap is very important for improving the transmission efficiency and avoiding the quality deterioration of light beams. The invention patent CN109188609 proposes a scheme of realizing uniform heating by matching a single light beam with a rotating table. In the welding process, the position of the irradiation light beam is kept unchanged, and the quartz end cap and the optical fiber synchronously rotate to ensure uniform heating. The scheme has high requirement on the synchronous control precision of the servo motor, the fusion quality is reduced due to the difference of the rotating speed between the quartz end cap and the optical fiber, and the scheme is not suitable for fusing the long tail fiber quartz end cap. Utility model CN208780854 proposes a single-beam rotary scanning method, and quartz end cap position keeps motionless, through rotatory speculum, has realized the even heating of quartz end cap. However, the optical path scheme has moving components and is not highly reliable. In addition, there is a solution that uses an annular spot to weld the quartz end cap. CN208780854 uses a conical reflector and a circular truncated cone reflector to form an annular light spot on the end face of the end cap fused with the optical fiber, and heats the optical fiber and the end cap by using the annular light spot. CN103777279 and CN204256215 adopt a scheme of an axicon lens and a focusing lens to generate annular light spots, and uniform heating of the quartz end cap is realized. However, the ring-shaped light spot scheme adopts customized optical elements, which has the problem of high cost and brings certain difficulty to the debugging of the light path.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be used for fused multichannel beam splitting system of quartzy end cap.
In order to solve the problem, the utility model provides a multichannel beam split system for quartz end cap butt fusion system, through four ways beam split then focus on, improved the quartz end cap butt fusion in-process uneven problem of being heated, improved the butt fusion quality of optic fibre and quartz end cap, improved transmission efficiency. The optical path has no moving element, adopts standardized optical elements, does not need to customize special optical elements, has high system reliability and low cost, and is suitable for industrial production.
The utility model provides a multichannel beam splitting system for butt fusion of quartz end cap, includes the beam splitting light path, the beam splitting light path includes carbon dioxide laser light source, first beam splitter, first high reflection mirror, second beam splitter, the high reflection mirror of second, the high reflection mirror of third, third beam splitter, the high reflection mirror of fourth, the high reflection mirror of fifth, quartz end cap, first focusing mirror, second focusing mirror, third focusing mirror and fourth focusing mirror, through the beam splitting light path divides the laser of carbon dioxide laser light source output into four ways light beam, assembles the quartz end cap through a plurality of focusing mirrors from four directions, and the quartz end cap fusion bonding region is heated evenly to realize the butt fusion of quartz end cap and optic fibre.
Preferably, the laser emitted by the carbon dioxide laser light source is output to the first beam splitter, and the transmitted light of the first beam splitter is input to the first high-reflection mirror; the reflected light of the first beam splitter is incident on the second beam splitter; the reflected light of the second beam splitter is incident on the third high-reflection mirror, and the transmitted light of the second beam splitter is incident on the second high-reflection mirror; emergent light of the second high-reflection mirror is incident on the first focusing mirror, and emergent light of the third high-reflection mirror is incident on the second focusing mirror; emergent light of the first high-reflection mirror is incident on the third beam splitter; the reflected light of the third beam splitter is incident on the third focusing mirror; the transmission light of the third beam splitter is incident to a fourth high-reflection mirror; emergent light of the fourth high-reflectivity mirror is incident on the fifth high-reflectivity mirror, and emergent light of the fifth high-reflectivity mirror is incident on the fourth focusing mirror.
Preferably, the first beam splitter, the second beam splitter and the third beam splitter are all beam splitters with polarization insensitive reflection/transmission ratio of 50.
Preferably, the first beam splitter, the second beam splitter and the third beam splitter are all polarization beam splitters, laser emitted by the carbon dioxide laser light source is output to a polarizer, is changed into linearly polarized light through the polarizer, is changed into circularly polarized light through the first quarter-wave plate, emergent light of the first quarter-wave plate is incident to the first beam splitter, P-polarized transmitted light of the first beam splitter is input to the second quarter-wave plate, and emergent light of the second quarter-wave plate is incident to the first high-reflection mirror; the S-polarized reflected light of the first beam splitter is incident on a third quarter-wave plate, and the emergent light of the third quarter-wave plate is incident on a second beam splitter; the S-polarized reflected light of the second beam splitter is incident on the third high-reflection mirror, and the P-polarized transmitted light of the second beam splitter is incident on the second high-reflection mirror; emergent light of the second high-reflection mirror is incident on the first focusing mirror, and emergent light of the third high-reflection mirror is incident on the second focusing mirror; emergent light of the first high-reflection mirror is incident on the third beam splitter; the S-polarized reflected light of the third beam splitter is incident on the third focusing mirror; the P-polarized transmission light of the third beam splitter is incident to a fourth high-reflection mirror; emergent light of the fourth high-reflection mirror is incident on the fifth high-reflection mirror, and emergent light of the fifth high-reflection mirror is incident on the fourth focusing mirror.
Preferably, the first focusing lens, the second focusing lens, the third focusing lens and the fourth focusing lens sequentially surround the quartz end cap.
Preferably, the first beam splitter, the second beam splitter and the third beam splitter are made of zinc selenide, the incident surface is coated with a beam splitting film, and the emergent surface is coated with an antireflection film.
Preferably, the four paths of beam-splitting light are focused to a welding area of the quartz end cap by the focusing mirror, the material of the focusing mirror is zinc selenide, and the two light transmission surfaces are both plated with antireflection films. The size of a focusing light spot on the quartz end cap can be adjusted by changing the distance between the focusing lens and the quartz end cap, so that the technological parameters can be adjusted.
Preferably, in a plane perpendicular to the extending direction of the optical fiber and/or the quartz end cap, if a rectangular coordinate system is established with the quartz end cap as the center, the first focusing mirror, the second focusing mirror, the third focusing mirror and the fourth focusing mirror are respectively located in four quadrants of the coordinate system, the axis of the first focusing mirror is parallel to the axis of the third focusing mirror, the axis of the second focusing mirror is parallel to the axis of the fourth focusing mirror, and the axis of the first focusing mirror is perpendicular to the axis of the second focusing mirror; the first focusing lens, the second focusing lens, the third focusing lens and the fourth focusing lens respectively focus the four laser beams on the quartz end cap.
Preferably, when the incident angle is 45 °, the beam splitter is highly reflective for s-polarized light and highly transmissive for p-polarized light, and the second quarter-wave plate and the third quarter-wave plate are used for converting linearly polarized light into circularly polarized light.
The beneficial effects of the utility model reside in that, through dividing into four light with a bundle of light is efficient, with the even focus of light around the end cap, divide light through four ways and then focus on, improved the uneven problem of being heated among the quartz end cap welding process, improved the butt fusion quality of optic fibre and quartz end cap, improved transmission efficiency. The optical path has no moving element, adopts standardized optical elements, does not need to customize special optical elements, has high system reliability and low cost, and is suitable for industrial production.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the drawings.
As shown in FIG. 1, the utility model discloses a multichannel beam split optical path system for quartzy end cap welding system mainly includes carbon dioxide laser light source, 3 beam splitters, 5 high reflection mirrors, 4 focusing mirrors for the butt fusion of quartzy end cap. The light source is divided into four paths of light beams by the combination of the optical elements, and the light beams are focused by the lens to uniformly heat the designated area of the quartz end cap, so that the high-quality fusion of the quartz end cap and the optical fiber is realized.
The light splitting path comprises a carbon dioxide laser light source 1, a first beam splitter 2, a first high-reflection mirror 3, a second beam splitter 4, a second high-reflection mirror 5, a third high-reflection mirror 6, a third beam splitter 7, a fourth high-reflection mirror 8, a fifth high-reflection mirror 9, a quartz end cap 10, a first focusing mirror 11, a second focusing mirror 12, a third focusing mirror 13 and a fourth focusing mirror 14.
The carbon dioxide laser light source 1 is used for generating collimated carbon dioxide single-mode laser; the first beam splitter 2, the second beam splitter 4 and the third beam splitter 7 are all beam splitters with a reflection/transmission ratio of 50, preferably, the materials are all zinc selenide, the incident surface is plated with a beam splitting film, and the emergent surface is plated with an antireflection film.
The high reflector is used for changing the direction of the light beam, and the substrate is preferably silicon, and the surface is plated with gold.
The focusing mirror focuses four paths of beam splitting light to a designated area of the quartz end cap, preferably, the material is zinc selenide, and the two light passing surfaces are both plated with antireflection films. By changing the distance between the focusing mirror and the quartz end cap 10, the size of the focused light spot on the quartz end cap can be adjusted, thereby adjusting the process parameters.
Preferably, the beam is split into four beams by using 3 polarization insensitive beam splitters with a reflection/transmission ratio of 50, preferably, each beam has an optical power of 25% of the total optical power;
the first beam splitter 2 divides the carbon dioxide laser incident to the first beam splitter into two beams of light with equal power, namely reflected light of the first beam splitter and transmitted light of the first beam splitter;
the second beam splitter 4 divides the carbon dioxide laser incident to the second beam splitter into two beams of light with equal power, namely reflected light of the second beam splitter and transmitted light of the second beam splitter;
the third beam splitter 7 divides the carbon dioxide laser incident to the third beam splitter into two beams of light with equal power, namely reflected light of the third beam splitter and transmitted light of the third beam splitter;
irradiating the four beams of light on the quartz end cap through a focusing lens, and uniformly heating the quartz end cap;
laser emitted by the carbon dioxide laser light source 1 is output to the first beam splitter 2, and transmitted light of the first beam splitter 2 is input to the first high-reflection mirror 3; the reflected light of the first beam splitter 2 is incident on the second beam splitter 4; the reflected light of the second beam splitter 4 is incident on the third high-reflection mirror 6, and the transmitted light of the second beam splitter 4 is incident on the second high-reflection mirror 5; emergent light of the second high-reflection mirror 5 is incident on the first focusing mirror 11, and emergent light of the third high-reflection mirror 6 is incident on the second focusing mirror 12; emergent light of the first high-reflection mirror 3 is incident on the third beam splitter 7; the reflected light of the third beam splitter 7 is incident on the third focusing mirror 13; the transmitted light of the third beam splitter 7 enters a fourth high-reflection mirror 8; emergent light of the fourth high-reflectivity mirror 8 is incident on a fifth high-reflectivity mirror 9, and emergent light of the fifth high-reflectivity mirror 9 is incident on a fourth focusing mirror 14; the first focusing lens, the second focusing lens, the third focusing lens and the fourth focusing lens sequentially surround the quartz end cap; if a rectangular coordinate system is established by taking the quartz end cap as the center in a plane vertical to the extension direction of the optical fiber and/or the quartz end cap, the first focusing lens, the second focusing lens, the third focusing lens and the fourth focusing lens are respectively positioned in four quadrants of the coordinate system, preferably, the axis of the first focusing lens is parallel to the axis of the third focusing lens, the axis of the second focusing lens is parallel to the axis of the fourth focusing lens, and the axis of the first focusing lens is vertical to the axis of the second focusing lens; the first focusing lens, the second focusing lens, the third focusing lens and the fourth focusing lens respectively focus the four laser beams onto the quartz end cap from four directions.
Preferably, the position of the focusing lens is adjustable, the illumination area on the quartz end cap can be flexibly adjusted, and the welding device is suitable for welding of optical fibers with different core diameters and quartz end caps with different geometric shapes.
Preferably, four paths of light splitting are adopted, so that the quartz end cap is heated uniformly, the temperature gradient in the quartz end cap is reduced, the thermal stress is reduced, and the welding quality is improved.
The optical path has no moving element, adopts standardized optical elements, does not need to customize special optical elements, has high system reliability and low cost, and is suitable for industrial production.
In the previously described solution, the beam splitters are all polarization insensitive 50 a reflection/transmission ratio. Another embodiment can be seen in fig. 2, and in another embodiment, polarization splitting can be used to split the beam. The protocol is as follows.
In this scheme, the first beam splitter 2, the second beam splitter 4, and the third beam splitter 7 are all polarization beam splitters. When the incident angle is 45 degrees, the beam splitter is highly reflective to s-polarized light and highly transmissive to p-polarized light. The second and third quarter- wave plates 17 and 18 are used to convert linearly polarized light into circularly polarized light.
The randomly polarized light emitted by the laser 1 is changed into linearly polarized light through the polarizer 15 and then changed into circularly polarized light through the first quarter-wave plate 16.
The light beam is split into two beams by the first beam splitter 2. Where the s-polarized component is reflected and converted again to circularly polarized light by the third quarter-wave plate 18. Then the second beam splitter 4 splits the circularly polarized light into two beams of light with mutually vertical polarization states again, and the two beams of light are focused to the designated position of the quartz end cap after the direction of the two beams of light is changed by the high-reflection mirror. The p-polarized component is transmitted through the first beam splitter 2 and converted into circularly polarized light again by the second quarter-wave plate 17. Then the third beam splitter 7 splits the circularly polarized light into two beams of light with mutually vertical polarization states again, and the two beams of light are focused to the designated position of the quartz end cap after the direction of the circularly polarized light is changed by the high-reflection mirror.
The first beam splitter 2 divides the carbon dioxide laser incident to the first beam splitter into two beams of light, namely S-polarized reflected light of the first beam splitter and P-polarized transmitted light of the first beam splitter;
the second beam splitter 4 divides the carbon dioxide laser incident to the second beam splitter into two beams of light, namely S-polarized reflected light of the second beam splitter and P-polarized transmitted light of the second beam splitter;
the third beam splitter 7 divides the carbon dioxide laser incident to the third beam splitter into two beams of light, namely S-polarized reflected light of the third beam splitter and P-polarized transmitted light of the third beam splitter;
laser emitted by the carbon dioxide laser light source 1 is output to a polarizer 15, is changed into linearly polarized light through the polarizer 15, is changed into circularly polarized light through a first quarter-wave plate 16, emergent light of the first quarter-wave plate 16 is incident to a first beam splitter 2, P polarized transmitted light of the first beam splitter 2 is input to a second quarter-wave plate 17, and emergent light of the second quarter-wave plate 17 is incident to a first high-reflection mirror 3; the S-polarized reflected light of the first beam splitter 2 is incident on the third quarter-wave plate 18, and the emergent light of the third quarter-wave plate 18 is incident on the second beam splitter 4; the S-polarized reflected light of the second beam splitter 4 is incident on the third high-reflection mirror 6, and the P-polarized transmitted light of the second beam splitter 4 is incident on the second high-reflection mirror 5; emergent light of the second high-reflection mirror 5 is incident on the first focusing mirror 11, and emergent light of the third high-reflection mirror 6 is incident on the second focusing mirror 12; emergent light of the first high-reflection mirror 3 is incident on the third beam splitter 7; the S-polarized reflected light of the third beam splitter 7 is incident on the third focusing mirror 13; the P-polarized transmitted light of the third beam splitter 7 is incident on the fourth high-reflection mirror 8; emergent light of the fourth high-reflectivity mirror 8 is incident on a fifth high-reflectivity mirror 9, and emergent light of the fifth high-reflectivity mirror 9 is incident on a fourth focusing mirror 14; the first focusing lens, the second focusing lens, the third focusing lens and the fourth focusing lens sequentially surround the quartz end cap; if a rectangular coordinate system is established by taking the quartz end cap as the center in a plane vertical to the extension direction of the optical fiber and/or the quartz end cap, the first focusing lens, the second focusing lens, the third focusing lens and the fourth focusing lens are respectively positioned in four quadrants of the coordinate system, preferably, the axis of the first focusing lens is parallel to the axis of the third focusing lens, the axis of the second focusing lens is parallel to the axis of the fourth focusing lens, and the axis of the first focusing lens is vertical to the axis of the second focusing lens; the first focusing lens, the second focusing lens, the third focusing lens and the fourth focusing lens respectively focus the four laser beams onto the quartz end cap from four directions.
Compared with the scheme, the first scheme adopts fewer optical elements, has low system complexity and is more convenient to adjust.
The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive step, and these embodiments are all intended to fall within the scope of the present invention.
Claims (9)
1. The utility model provides a multichannel beam splitting system for quartz end cap butt fusion, a serial communication port, including the beam splitting light path, the beam splitting light path includes carbon dioxide laser light source (1), first beam splitter (2), first high reflection mirror (3), second beam splitter (4), second high reflection mirror (5), third high reflection mirror (6), third beam splitter (7), fourth high reflection mirror (8), fifth high reflection mirror (9), quartz end cap (10), first focusing mirror (11), second focusing mirror (12), third focusing mirror (13) and fourth focusing mirror (14), through the beam splitting light path divides into four ways light beam with the laser of carbon dioxide laser light source output, assembles the quartz end cap from four directions through a plurality of focusing mirrors, evenly heats quartz end cap butt fusion region to realize the butt fusion of quartz end cap and optic fibre.
2. The multi-path light splitting system for quartz end cap welding according to claim 1, characterized in that the laser light emitted from the carbon dioxide laser light source (1) is output to the first beam splitter (2), and the transmitted light of the first beam splitter (2) is input to the first high reflection mirror (3); the reflected light of the first beam splitter (2) is incident on the second beam splitter (4); the reflected light of the second beam splitter (4) is incident on the third high-reflection mirror (6), and the transmitted light of the second beam splitter (4) is incident on the second high-reflection mirror (5); emergent light of the second high-reflection mirror (5) is incident on the first focusing mirror (11), and emergent light of the third high-reflection mirror (6) is incident on the second focusing mirror (12); emergent light of the first high-reflection mirror (3) is incident on a third beam splitter (7); the reflected light of the third beam splitter (7) is incident on a third focusing mirror (13); the transmitted light of the third beam splitter (7) enters a fourth high-reflection mirror (8); the emergent light of the fourth high-reflection mirror (8) is incident on a fifth high-reflection mirror (9), and the emergent light of the fifth high-reflection mirror (9) is incident on a fourth focusing mirror (14).
3. The multiple beam splitting system for quartz end cap welding according to claim 2, characterized in that the first beam splitter (2), the second beam splitter (4) and the third beam splitter (7) are all polarization insensitive 50.
4. The multi-path light splitting system for welding the quartz end caps according to claim 1, wherein the first beam splitter (2), the second beam splitter (4) and the third beam splitter (7) are all polarization beam splitters, laser emitted by the carbon dioxide laser light source (1) is output to a polarizer (15), is converted into linearly polarized light through the polarizer (15), is converted into circularly polarized light through a first quarter-wave plate (16), emergent light of the first quarter-wave plate (16) is incident on the first beam splitter (2), P-polarized transmitted light of the first beam splitter (2) is input to a second quarter-wave plate (17), and emergent light of the second quarter-wave plate (17) is incident on the first high-reflection mirror (3); the S-polarized reflected light of the first beam splitter (2) is incident to a third quarter wave plate (18), and emergent light of the third quarter wave plate (18) is incident to a second beam splitter (4); the S-polarized reflected light of the second beam splitter (4) is incident on the third high-reflection mirror (6), and the P-polarized transmitted light of the second beam splitter (4) is incident on the second high-reflection mirror (5); emergent light of the second high-reflection mirror (5) is incident on the first focusing mirror (11), and emergent light of the third high-reflection mirror (6) is incident on the second focusing mirror (12); emergent light of the first high-reflection mirror (3) is incident on a third beam splitter (7); the S-polarized reflected light of the third beam splitter (7) is incident on a third focusing mirror (13); p-polarized transmission light of the third beam splitter (7) enters a fourth high-reflection mirror (8); the emergent light of the fourth high-reflection mirror (8) is incident on a fifth high-reflection mirror (9), and the emergent light of the fifth high-reflection mirror (9) is incident on a fourth focusing mirror (14).
5. The optical demultiplexing system according to claim 2 or 4, wherein the first focusing lens, the second focusing lens, the third focusing lens and the fourth focusing lens are sequentially arranged around the quartz end cap.
6. The multi-path light splitting system for quartz end cap welding according to claim 5, wherein the first beam splitter (2), the second beam splitter (4) and the third beam splitter (7) are made of zinc selenide, the incident surface is coated with a light splitting film, and the emergent surface is coated with an antireflection film.
7. The multi-path light splitting system for welding of the quartz end cap according to claim 5, wherein the focusing mirror focuses four paths of light split into the welding area of the quartz end cap, the material of the light split is zinc selenide, the two light transmission surfaces are both coated with an antireflection film, and the size of a focusing light spot on the quartz end cap can be adjusted by changing the distance between the focusing mirror and the quartz end cap (10), so that technological parameters can be adjusted.
8. The demultiplexing system for fused silica end caps according to claim 5, wherein if a rectangular coordinate system is established centering on the silica end cap in a plane perpendicular to the extending direction of the optical fiber and/or the silica end cap, the first focusing lens, the second focusing lens, the third focusing lens and the fourth focusing lens are respectively located in four quadrants of the coordinate system, the axis of the first focusing lens is parallel to the axis of the third focusing lens, the axis of the second focusing lens is parallel to the axis of the fourth focusing lens, and the axis of the first focusing lens is perpendicular to the axis of the second focusing lens; the first focusing lens, the second focusing lens, the third focusing lens and the fourth focusing lens respectively focus the four laser beams on the quartz end cap.
9. The demultiplexing system for fused silica endcap of claim 4 wherein the beam splitter is highly reflective for s-polarized light and highly transmissive for p-polarized light at an angle of incidence of 45 ° and the second (17) and third (18) quarter wave plates are used to convert linearly polarized light to circularly polarized light.
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| CN202222675264.XU CN218848378U (en) | 2022-10-11 | 2022-10-11 | Multi-path light splitting system for welding quartz end cap |
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| CN202222675264.XU CN218848378U (en) | 2022-10-11 | 2022-10-11 | Multi-path light splitting system for welding quartz end cap |
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