Multi-ring beam coupling optical fiber

Abstract

The utility model relates to a multi-ring light beam coupling optical fiber, the multi-ring light beam coupling optical fiber comprises a multi-cladding transmission optical fiber, the multi-cladding transmission optical fiber comprises a middle core and at least two layers of ring cores, the at least two layers of ring cores are sequentially and annularly arranged in the middle core and are coaxially arranged with the middle core, the middle core is used for transmitting circular light beams, and the middle core is used for transmitting the circular light beams. The ring core is used for transmitting an annular light beam; the input optical fibers comprise a first input optical fiber and a plurality of second input optical fibers, the second input optical fibers are symmetrically arranged on the two sides of the first input optical fiber in pairs, the first input optical fiber is aligned with the middle core, and each layer of ring core is aligned with the two second input optical fibers in pairs. The multi-ring light beam coupling optical fiber can realize multi-dimensional light beam adjustment.

Description

Technical Field

[0001] The present disclosure relates to the field of optical fiber laser technology, and in particular to a multi-ring beam coupling optical fiber. Background Art

[0002] As the demand for laser processing technology gradually shifts from single application to diversified application, the application value of lasers with special energy distribution is gradually being discovered. The annular spot laser system welding can stabilize the molten pool, reduce defects such as explosion and spatter, pore cracks, etc., and has good processing effects in applications such as high-speed welding of lithium batteries for electric vehicles, welding of battery cells for aluminum battery shells, and cutting of thin and thick metals of different thicknesses.

[0003] There are many ways to implement the ring spot laser system. The optical fiber structure in the related technology can only achieve adjustment in two dimensions: the central beam and the outer ring beam, and the ability to control the shape of the laser energy distribution is limited. Utility Model Content

[0004] The purpose of the present disclosure is to provide a multi-ring beam coupling optical fiber, which can achieve beam adjustment in multiple dimensions.

[0005] In order to achieve the above-mentioned object, the present disclosure provides a multi-ring beam coupling optical fiber, which comprises: a multi-cladding transmission optical fiber, which comprises a central core and at least two layers of ring cores, wherein the at least two layers of the ring cores are sequentially arranged around the central core and coaxially arranged with the central core, wherein the central core is used to transmit a circular beam, and the ring core is used to transmit a ring-shaped beam; and an input optical fiber, which comprises a first input optical fiber and a plurality of second input optical fibers, wherein the plurality of second input optical fibers are arranged in pairs and symmetrically on both sides of the first input optical fiber, wherein the first input optical fiber is aligned with the central core, and each layer of the ring core is aligned with two pairs of the second input optical fibers.

[0006] Optionally, the multi-ring beam coupling optical fiber includes a fiber bundle fused cone, the fiber bundle fused cone includes a glass tube, part of the input optical fiber is loaded into the interior of the glass tube, the glass tube and the input optical fiber are fused with the multi-clad transmission optical fiber, and the fiber bundle fused cone is used to couple the light transmitted by the first input optical fiber into the core, and couple the light transmitted by the second input optical fiber into the ring core.

[0007] Optionally, the refractive index of the glass tube is lower than the refractive index of the input optical fiber.

[0008] Optionally, the glass tube is configured as a quartz capillary square tube.

[0009] Optionally, the first input optical fiber and the plurality of second input optical fibers are arranged parallel to each other in the glass tube.

[0010] Optionally, the glass tube includes a first tube segment, a tapered tube and a second tube segment, the second tube segment is fused with the multi-clad transmission optical fiber, the tapered tube is connected between the first tube segment and the second tube segment, and the tube mouth of the tapered tube gradually decreases from the first tube segment to the second tube segment, and the length of the first tube segment and the second tube segment is 0 to 20 mm.

[0011] Optionally, a first cladding layer is respectively arranged between the central core and the ring core and between two adjacent layers of the ring core.

[0012] Optionally, the outermost ring core is wrapped with a second cladding.

[0013] Optionally, the second cladding is wrapped with a coating layer.

[0014] Optionally, the thickness of the first cladding layer is 10um to 20um, and / or the thickness of the second cladding layer is 10um to 50um.

[0015] Optionally, the diameter of the central core is 30 um to 50 um; the thickness of the ring core is equal to the diameter of the central core.

[0016] Through the above technical solution, the core is a circular optical fiber for outputting a circular light beam, and the ring core is a ring optical fiber for outputting a ring optical beam. By correspondingly connecting the first input optical fiber to the core, the light of the first input optical fiber is coupled into the core, and the second input optical fibers on both sides of the first input optical fiber are sequentially connected to the ring cores arranged outside the core in a one-to-one correspondence, so as to couple the light of the second input optical fiber into the corresponding ring core, so that the core and at least two layers of ring cores can output a combined light beam of a circular light beam and at least two layers of ring light beams. Therefore, the multi-clad transmission optical fiber disclosed in the present invention has at least three independent light guiding areas, and the laser beam energy distribution of the multi-ring beam coupling optical fiber can have at least three-dimensional control capabilities, so that the laser energy distribution can be more flexibly controlled as needed. Among them, optical fiber coupling refers to the process of transmitting an optical signal from one optical fiber to another optical fiber.

[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0019] Figure 1 is a schematic structural diagram of a multi-ring beam coupling optical fiber provided in an embodiment of the present disclosure;

[0020] Figure 2 yes Figure 1 A cross-sectional view of

[0021] Figure 3 yes Figure 1 The cross-sectional view at point B;

[0022] Figure 4 It is a schematic diagram of the structure of the fiber bundle fused cone in the multi-ring beam coupling optical fiber provided in an embodiment of the present disclosure.

[0023] Description of Reference Numerals

[0024] 1-multi-clad transmission optical fiber, 11-core, 12-ring core, 13-first cladding, 14-second cladding, 15-coating, 2-input optical fiber, 21-first input optical fiber, 22-second input optical fiber, 3-optical fiber bundle fused cone, 31-glass tube, 311-first tube section, 312-tapered tube, 313-second tube section. DETAILED DESCRIPTION

[0025] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0026] In the present disclosure, unless otherwise stated, the use of the terms "first", "second", etc. is intended to distinguish different components and does not have order or importance. In addition, in the following description, when referring to the drawings, the same reference numerals in different drawings represent the same elements. It should be understood by those skilled in the art that the above definitions are only used to explain and illustrate the present disclosure and should not be construed as limiting the present disclosure.

[0027] According to the specific implementation of the present disclosure, Figures 1 to 4 As shown, a multi-ring beam coupling optical fiber is provided, which comprises: a multi-cladding transmission optical fiber 1, which comprises a core 11 and at least two layers of ring cores 12, wherein the at least two layers of ring cores 12 are sequentially arranged around the core 11 and coaxially arranged with the core 11, wherein the core 11 is used to transmit a circular light beam, and the ring core 12 is used to transmit an annular light beam; and an input optical fiber 2, which comprises a first input optical fiber 21 and a plurality of second input optical fibers 22, wherein the plurality of second input optical fibers 22 are arranged in pairs and symmetrically on both sides of the first input optical fiber 21, wherein the first input optical fiber 21 is aligned with the core 11, and each layer of the ring core 12 is aligned with two pairs of second input optical fibers 22.

[0028] Through the above technical solution, the core 11 is a circular optical fiber for outputting a circular light beam, and the ring core 12 is a ring optical fiber for outputting a ring optical beam. By correspondingly connecting the first input optical fiber 21 to the core 11, the light of the first input optical fiber 21 is coupled into the core 11, and the second input optical fibers 22 on both sides of the first input optical fiber 21 are sequentially connected to the ring core 12 arranged outside the core 11 in a one-to-one correspondence, so as to couple the light of the second input optical fiber 22 into the corresponding ring core 12, so that the core 11 and at least two layers of ring cores 12 can output a circular light beam and a combined light beam of at least two layers of ring light beams. Therefore, the multi-clad transmission optical fiber 1 disclosed in the present invention has at least three independent light guiding areas, and the laser beam energy distribution of the multi-ring beam coupling optical fiber can have at least three-dimensional control capabilities, so that the laser energy distribution can be more flexibly controlled as needed. Among them, the coupling of optical fibers refers to the process of transmitting an optical signal from one optical fiber to another optical fiber.

[0029] In addition, in some embodiments of the present disclosure, the ring core 12 can be provided with two or more layers to output two or more layers of annular light beams, which is not specifically limited in the present disclosure. Figures 1 to 4 As shown, the ring core 12 can be set to five layers to form six independent light guiding areas of a circular light beam and five annular light beams, and the number of the first input optical fiber 21 is one to correspond to the core 11, and the number of the second transmission optical fibers is ten, which are symmetrically arranged on both sides of the first input optical fiber 21, respectively corresponding to the five-layer ring core 12.

[0030] In some embodiments of the present disclosure, reference Figure 1 and Figure 4 As shown, the multi-ring beam coupling optical fiber includes a fiber bundle fused cone 3, and the fiber bundle fused cone 3 includes a glass tube 31. Part of the input optical fiber 2 is loaded into the glass tube 31. The glass tube 31 and the input optical fiber 2 are both fused with the multi-clad transmission optical fiber 1. The fiber bundle fused cone 3 is used to couple the light transmitted by the first input optical fiber 21 into the core 11, and to couple the light transmitted by the second input optical fiber 22 into the ring core 12. The fiber bundle fused cone 3 is obtained by inserting one end of the input optical fiber 2 into the glass tube 31 and melting and tapering at high temperature. After the end of the fiber bundle fused cone 3 is cut flat, the first input optical fiber 21 and the second input optical fiber 22 can be fused with the multi-clad transmission optical fiber 1. Therefore, through the optical fiber precision fusion technology, the light energy output by the input optical fiber 2 can be coupled to the multi-clad transmission optical fiber 1 to the maximum extent, and the influence on the system caused by its intervention in the optical path can be minimized.

[0031] In some embodiments of the present disclosure, the refractive index of the glass tube 31 is lower than the refractive index of the input optical fiber 2. In this way, by using a low refractive index material as a tube body to accommodate the input optical fiber 2, the total reflection principle formed by the high refractive index medium (i.e., the input optical fiber 2) can be used to confine the light to the high refractive index medium for propagation, so that the light beam propagates in the input optical fiber 2 inside the glass tube 31.

[0032] In some embodiments of the present disclosure, reference Figure 3 As shown, the glass tube 31 can be constructed as a quartz capillary square tube. On the one hand, the quartz capillary has a natural consistency with the optical fiber in terms of material. On the other hand, due to the high strength and elasticity of the quartz capillary, it can be accurately drawn into the inner diameter and outer diameter of the required size, which facilitates the insertion of the input optical fiber 2 into the quartz capillary and then melting and tapering at high temperature. At the same time, the molten cone 3 of the optical fiber bundle formed after tapering can better correspond to the multi-clad transmission optical fiber 1, thereby improving the reliability of optical signal transmission.

[0033] In some embodiments of the present disclosure, reference Figure 3 and Figure 4 As shown, the first input optical fiber 21 and the plurality of second input optical fibers 22 can be arranged parallel to each other in the glass tube 31. In this way, the first transmission optical fiber and the second transmission optical fiber can be quickly arranged to improve processing efficiency, and the arranged first input optical fiber 21 and the second input optical fiber 22 are convenient for corresponding fusion splicing with the central core 11 and the ring core 12.

[0034] In other embodiments of the present disclosure, the second input optical fiber 22 corresponding to each layer of the ring core 12 can be set in plurality, and the plurality of second input optical fiber rings 22 corresponding to the same layer of the ring core 12 are arranged at intervals along the circumference of the layer of the ring core 12 .

[0035] In some embodiments of the present disclosure, reference Figure 1 and Figure 4As shown, the glass tube 31 may include a first tube section 311, a tapered tube 312, and a second tube section 313. The second tube section 313 is fused with the multi-clad transmission optical fiber 1. The tapered tube 312 is connected between the first tube section 311 and the second tube section 313. The tube opening of the tapered tube 312 gradually decreases from the first tube section 311 to the second tube section 313. The lengths of the first tube section 311 and the second tube section 313 are 0 to 20 mm. The tube opening size of the first tube section 311 remains unchanged in its extension direction, and the tube opening size of the first tube section 311 is consistent with the tube opening size at the maximum tube opening of the tapered tube 312. The tube opening size of the second tube section 313 remains unchanged in its extension direction, and the tube opening size of the second tube section 313 is consistent with the tube opening size at the minimum tube opening of the tapered tube 312. In this way, after the input optical fiber 2 is arranged, the corresponding fusion splicing and coupling with the multi-clad transmission optical fiber 1 can be achieved, and by setting the tapered tube 312 transition, while satisfying the corresponding fusion splicing of the input optical fiber 2 and the multi-clad transmission optical fiber 1, low-loss transmission of the optical signal can be achieved, greatly improving the coupling efficiency.

[0036] In some embodiments of the present disclosure, reference Figure 2 As shown, a first cladding 13 can be provided between the core 11 and the ring core 12 and between two adjacent layers of the ring core 12. The first cladding 13 is used to protect the core 11 and the ring core 12 and to improve the efficiency and reliability of the transmission of the optical signal in the core 11 and the ring core 12. At the same time, since the core diameter of the optical fiber is very small, it is easy to lose the energy of light. By providing the first cladding 13, the propagation of light in the core can be limited by total internal reflection, thereby reducing the attenuation and loss of the optical signal. Among them, total reflection means that since the refractive index of the optical fiber cladding is lower than that of the optical fiber core, the optical signal incident on the surface of the optical fiber will be totally reflected when encountering the cladding, thereby reliably guiding the optical signal to be transmitted in the optical fiber.

[0037] In some embodiments of the present disclosure, reference Figure 2 As shown, the outside of the outermost ring core 12 can be wrapped with a second cladding 14, and the second cladding 14 is used to protect the outermost ring core 12, prevent the input optical fiber 2 as a whole from being damaged and disturbed by the outside world, and effectively protect the structural integrity of the input optical fiber 2 as a whole, and can also enhance the mechanical strength of the input optical fiber 2 as a whole, and prevent the input optical fiber 2 from being broken or damaged as a whole.

[0038] In some embodiments of the present disclosure, reference Figure 2 As shown, the second cladding 14 may be wrapped with a coating layer 15. Thus, the coating layer 15 can protect the surface of the input optical fiber 2 from being scratched by humid gas and external force, improve the microbending resistance of the input optical fiber 2, and reduce the microbending additional loss function of the input optical fiber 2.

[0039] In some embodiments of the present disclosure, the thickness of the first cladding 13 may be 10um to 20um, and / or the thickness of the second cladding 14 may be 10um to 50um. In this way, the thickness of the first cladding 13 can ensure the stability of the signal during transmission in the core 11 and the ring core 12, and the thickness of the second cladding 14 can ensure that the optical fiber transmission in the input optical fiber 2 is not subject to external interference.

[0040] In some embodiments of the present disclosure, the diameter of the core 11 may be 30um to 50um; the thickness of the ring core 12 is equal to the diameter of the core 11. In this way, by limiting the diameter of the core 11 and the thickness of the ring core 12, the transmission capacity requirement of the multi-clad transmission optical fiber 1 can be met, and at the same time, the loss in the signal transmission process can be reduced, avoiding the problem of excessive signal transmission loss caused by too small a diameter.

[0041] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0043] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A multi-ring beam coupling optical fiber, characterized in that: The multi-ring beam coupling optical fiber comprises: A multi-clad transmission optical fiber, the multi-clad transmission optical fiber comprising a central core and at least two layers of ring cores, the at least two layers of the ring cores are sequentially arranged around the central core and coaxially arranged with the central core, the central core is used to transmit a circular light beam, and the ring core is used to transmit an annular light beam; and An input optical fiber, comprising a first input optical fiber and a plurality of second input optical fibers, wherein the plurality of second input optical fibers are arranged in pairs and symmetrically on both sides of the first input optical fiber, the first input optical fiber is aligned with the central core, and each layer of the ring core is aligned with two pairs of the second input optical fibers.

2. The multi-ring beam coupling optical fiber according to claim 1, characterized in that: The multi-ring beam coupling optical fiber includes a fiber bundle fused cone, which includes a glass tube. Part of the input optical fiber is loaded into the interior of the glass tube. The glass tube and the input optical fiber are both fused with the multi-clad transmission optical fiber. The fiber bundle fused cone is used to couple the light transmitted by the first input optical fiber into the central core and couple the light transmitted by the second input optical fiber into the ring core.

3. The multi-ring beam coupling optical fiber according to claim 2, characterized in that: The refractive index of the glass tube is lower than the refractive index of the input optical fiber.

4. The multi-ring beam coupling optical fiber according to claim 2, characterized in that: The glass tube is constructed as a quartz capillary square tube.

5. The multi-ring beam coupling optical fiber according to claim 2, characterized in that: The first input optical fiber and the plurality of second input optical fibers are arranged parallel to each other in the glass tube.

6. The multi-ring beam coupling optical fiber according to claim 2, characterized in that: The glass tube includes a first tube segment, a tapered tube and a second tube segment. The second tube segment is fused with the multi-clad transmission optical fiber. The tapered tube is connected between the first tube segment and the second tube segment. The tube mouth of the tapered tube gradually decreases from the first tube segment to the second tube segment. The length of the first tube segment and the second tube segment is 0 to 20 mm.

7. The multi-ring beam coupling optical fiber according to claim 1, characterized in that: A first cladding layer is respectively arranged between the central core and the ring core and between two adjacent layers of the ring core.

8. The multi-ring beam coupling optical fiber according to claim 7, characterized in that: The outermost ring core is wrapped with a second cladding.

9. The multi-ring beam coupling optical fiber according to claim 8, characterized in that: The second cladding layer is wrapped with a coating layer.

10. The multi-ring beam coupling optical fiber according to claim 8, characterized in that: The thickness of the first cladding layer is 10um to 20um, and / or, The thickness of the second cladding layer is 10 um to 50 um.

11. The multi-ring beam coupling optical fiber according to any one of claims 1 to 10, characterized in that: The diameter of the central core is 30um to 50um; the thickness of the ring core is equal to the diameter of the central core.

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