CN112285833A - Structure for filtering specific cladding light of optical fiber - Google Patents
Structure for filtering specific cladding light of optical fiber Download PDFInfo
- Publication number
- CN112285833A CN112285833A CN202011300753.6A CN202011300753A CN112285833A CN 112285833 A CN112285833 A CN 112285833A CN 202011300753 A CN202011300753 A CN 202011300753A CN 112285833 A CN112285833 A CN 112285833A
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- optical fiber
- cladding
- bare
- filtering
- input
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 98
- 238000005253 cladding Methods 0.000 title claims abstract description 75
- 238000001914 filtration Methods 0.000 title claims abstract description 37
- 239000011521 glass Substances 0.000 claims abstract description 41
- 239000011247 coating layer Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 20
- 239000010410 layer Substances 0.000 claims abstract description 8
- 239000000835 fiber Substances 0.000 claims description 31
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000007526 fusion splicing Methods 0.000 claims 2
- 230000014759 maintenance of location Effects 0.000 claims 2
- 238000005245 sintering Methods 0.000 claims 1
- 230000004927 fusion Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2551—Splicing of light guides, e.g. by fusion or bonding using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Lasers (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
The structure comprises an input optical fiber and an output optical fiber, wherein a section of coating layer is stripped at the input end of the output optical fiber to form a bare optical fiber, the part, which is not stripped, of the coating layer is called a coating layer retaining section, a section of glass sleeve or low-temperature glass powder is cladded on the cladding layer of the bare optical fiber to form a filtering area, the filtering area is not in contact with the coating layer retaining section, the numerical aperture of the input optical fiber cladding layer is NA1, the numerical aperture of the filtering area is NA2, the numerical aperture of the output optical fiber cladding layer is NA3, and NA3 is not less than NA2 and not more than NA 1. The invention can filter out partial leakage cladding light caused by the mismatch of numerical apertures of the input optical fiber cladding and the output optical fiber cladding, and obtain output light with higher power.
Description
Technical Field
The invention relates to an optical fiber laser, in particular to a structure for filtering specific cladding light of an optical fiber.
Prior Art
Along with the development of high power fiber laser, the output power of fiber laser is constantly promoted, the preparation of high power fiber laser is by gain fiber and each all-fiber device butt fusion form overall structure, need the butt fusion between each device when making high power fiber laser, the fusing point is many, the optic fibre that the device used can have the unmatched problem of fiber cladding Numerical Aperture (NA) because batch difference etc. if the NA of input fiber cladding is greater than the NA of output fiber cladding, can lead to partial cladding light leakage, transmit to and convert the heat into after the coating is absorbed, because the coating is endured the temperature low, will lead to the optic fibre to burn when the heat of converting surpasss a definite value. This requires filtering out unwanted light in the cladding. In some special cases, for example, some high-power fiber pump beam combiners, a fiber bundle is tapered and then welded to an output fiber in a manufacturing process, the NA of the output light is increased after the fiber bundle is tapered, and may exceed the NA of a waveguide structure formed by a cladding of the output fiber and a coating layer, resulting in leakage of part of the cladding light of the output fiber, and the part of the cladding light is transmitted to the coating layer and then converted into heat to burn out a device.
The current cladding light removal is mainly to filter out the cladding light by forming an uneven defect on the surface of an optical fiber coating layer through a physical or chemical method, the cladding light filtering method can filter out all the cladding light or part of the cladding light, however, the filtering of the part of the cladding light cannot specify the filtering exceeding a certain NA value for the light transmitted inside, and therefore, the method is not suitable for filtering out part of leakage cladding light caused by the mismatch of the cladding NA of an input optical fiber and an output optical fiber.
Disclosure of Invention
The invention aims to filter part of leakage cladding light caused by mismatching of numerical apertures NA of input optical fiber and output optical fiber cladding, provides a structure for filtering specific cladding light of an optical fiber, and reduces the thermal effect so as to obtain output light with higher power. The specific clad light means that the numerical apertures NA of the fiber claddings of the input fiber and the output fiber are mismatched, resulting in leakage of partial clad light out of the fiber cladding.
The technical solution of the invention is as follows:
a structure for filtering specific cladding light of an optical fiber comprises an input optical fiber and an output optical fiber, and is characterized in that a section of coating layer is stripped at the input end of the output optical fiber to form a bare optical fiber, the part, which is not stripped, of the coating layer is called a coating layer retaining section, a section of glass sleeve or low-temperature glass powder is cladded on the cladding layer of the bare optical fiber to form a filtering area, and the filtering area is not in contact with the coating layer retaining section;
the bare optical fiber and the input optical fiber are welded to form a welding point, and the welding point is not in contact with the filtering area;
or, the bare fiber and the input main fiber of the input fiber are the same fiber, and the starting endpoint of the bare fiber is not in contact with the filtering area.
The numerical aperture of the input optical fiber cladding is NA1, the numerical aperture of the filtering area is NA2, and the numerical aperture of the output optical fiber cladding is NA3, so that the numerical aperture of the filtering area is NA2, and NA2 is more than or equal to NA3 and NA1 is satisfied.
The input optical fiber is a plurality of bundled optical fibers or a single optical fiber.
Compared with the prior art, the invention has the following technical effects:
the invention adopts the glass sleeve or the low-temperature glass powder with the appointed refractive index to lead the leaked partial cladding light into the glass sleeve or the low-temperature glass powder, and the partial cladding light cannot be continuously transmitted backwards to the cladding layer, and the glass sleeve or the low-temperature glass powder has very high temperature resistance, so that the output optical fiber cladding layer can be protected. The numerical aperture NA of the section of the optical fiber cladding formed by cladding the glass sleeve or the low-temperature glass powder on the output optical fiber cladding is determined according to the NA of the input optical fiber cladding and the NA value of the output optical fiber cladding, the numerical aperture of the cladding of the input optical fiber is NA1, the numerical aperture of the section of the optical fiber cladding formed by cladding the glass sleeve or the low-temperature glass powder on the output optical fiber cladding is NA2, and the numerical aperture of the output optical fiber cladding is NA3, so that the NA2 meets the condition that the NA3 is not more than or equal to NA2 and is less than NA1, and therefore part of the leaked cladding light caused by the mismatch of the NA can be led into the glass sleeve or filtered out, the output optical fiber cannot be continuously transmitted to the output optical fiber cladding layer to damage the output optical fiber.
The invention can appoint to filter out specific cladding light and improve the output power of the fiber laser.
Drawings
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention
FIG. 2 is a schematic structural diagram of embodiment 2 of the present invention
FIG. 3 is a schematic structural diagram of embodiment 3 of the present invention
Detailed Description
The present invention provides the following 3 examples, but the scope of protection of the present invention is not limited thereto.
Example 1-end-pumped beam combiner:
referring to fig. 1, the structure for filtering out specific cladding light of an optical fiber of the present invention includes an input optical fiber 1 and an output optical fiber 3, wherein an input end of the output optical fiber 3 is stripped off a section of a coating layer to form a bare optical fiber 31, an unreleased part of the coating layer is called a coating layer retaining section 33, the bare optical fiber 31 is welded with the input optical fiber 1 to form a fusion point 2, a section of glass sleeve or low-temperature glass powder is cladded on the cladding of the bare optical fiber 31 to form a filtering region 32, the filtering region 32 is not in contact with the fusion point 2 and the coating layer retaining section 33, a numerical aperture of the cladding of the input optical fiber 1 is NA1, a numerical aperture of the filtering region 32 is NA2, a numerical aperture of the cladding of the output optical fiber 3 is NA3, and a numerical aperture of the filtering region 32 is NA2 which satisfies NA2 < NA.
The input optical fiber 1 is a plurality of beam-combining optical fibers, and the number of the beam-combining optical fibers is more than or equal to 2; the output optical fiber 3 is stripped of a section of coating layer, and the bare optical fiber 31 stripped of the coating layer is welded with the input optical fiber 1 to form a melting point 2; a section of glass sleeve or low-temperature glass powder is cladded on the cladding of the bare fiber 31 to form a filtering area 32, and the filtering area 32 is not contacted with the melting point 2 and the coating retaining section 33; the glass sleeve or the low-temperature glass powder cladding area has high temperature tolerance, so that the glass sleeve or the low-temperature glass powder cladding area can be packaged in a suspension mode, and can be further cooled and packaged to realize rapid heat dissipation.
The execution sequence of the above steps is not divided in sequence.
Example 2-side pumped beam combiner:
referring to fig. 2, an input optical fiber 1 is a plurality of bundled optical fibers, the number of the bundled optical fibers is not less than 2, 11 is an input main optical fiber, a coating layer is stripped from an output optical fiber 3, the output optical fiber 3 and the input main optical fiber 11 are the same optical fiber and have no melting point, but due to the process in the manufacturing process, the problem that the input optical fiber 1 and the output optical fiber 3 are not matched in NA still exists, so that the method in the invention can still be adopted, namely, a section of glass sleeve or low-temperature glass powder is cladded on the cladding of a bare optical fiber 31 to form a filtering area 32, and the filtering area 32 is not in contact with the output end position of. The glass sleeve or the low-temperature glass powder cladding area has high temperature tolerance, so that the glass sleeve or the low-temperature glass powder cladding area can be packaged in a suspension mode, and can be further cooled and packaged to realize rapid heat dissipation.
The execution sequence of the above steps is not divided in sequence.
Example 3-single fiber fusion splice:
referring to fig. 3, an input optical fiber 1 and an output optical fiber 3 are fused to form a melting point 2; a section of glass sleeve or low-temperature glass powder is cladded on the cladding of the bare fiber 31 to form a filtering area 32, and the filtering area 32 is not contacted with the melting point 2 and the coating retaining section 33; the glass sleeve or the low-temperature glass powder cladding area has high temperature tolerance, so that the glass sleeve or the low-temperature glass powder cladding area can be packaged in a suspension mode, and can be further cooled and packaged to realize rapid heat dissipation.
Experiments show that the invention can filter out partial leakage cladding light caused by the mismatch of numerical apertures of the input optical fiber cladding and the output optical fiber cladding, and obtain output light with higher power.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011300753.6A CN112285833A (en) | 2020-11-19 | 2020-11-19 | Structure for filtering specific cladding light of optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011300753.6A CN112285833A (en) | 2020-11-19 | 2020-11-19 | Structure for filtering specific cladding light of optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112285833A true CN112285833A (en) | 2021-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011300753.6A Pending CN112285833A (en) | 2020-11-19 | 2020-11-19 | Structure for filtering specific cladding light of optical fiber |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257399A (en) * | 2013-04-26 | 2013-08-21 | 中国人民解放军国防科学技术大学 | Device used for fiber laser and capable of filtering out cladding light |
| CN103269010A (en) * | 2013-05-10 | 2013-08-28 | 上海飞博激光科技有限公司 | Cladding light filtering structure and manufacturing method thereof |
| US20140362877A1 (en) * | 2012-12-19 | 2014-12-11 | Ipg Photonics Corporation | High power fiber laser system with distributive mode absorber |
| CN105068181A (en) * | 2015-08-28 | 2015-11-18 | 清华大学 | Optical fiber cladding optical filter and manufacturing method thereof |
| CN105428974A (en) * | 2015-12-01 | 2016-03-23 | 中电科天之星激光技术（上海）有限公司 | Method for filtering cladding light in optical fiber by glass powder |
| CN107272124A (en) * | 2017-07-19 | 2017-10-20 | 深圳市创鑫激光股份有限公司 | The cladding light stripper and preparation method of a kind of high-power laser optical fiber |
| CN107515472A (en) * | 2017-09-30 | 2017-12-26 | 四川思创优光科技有限公司 | Novel multimode pumping optical fiber combiner and manufacturing method thereof |
| CN213814030U (en) * | 2020-11-19 | 2021-07-27 | 上海飞博激光科技有限公司 | Structure for filtering specific cladding light of optical fiber |
-
2020
- 2020-11-19 CN CN202011300753.6A patent/CN112285833A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140362877A1 (en) * | 2012-12-19 | 2014-12-11 | Ipg Photonics Corporation | High power fiber laser system with distributive mode absorber |
| CN103257399A (en) * | 2013-04-26 | 2013-08-21 | 中国人民解放军国防科学技术大学 | Device used for fiber laser and capable of filtering out cladding light |
| CN103269010A (en) * | 2013-05-10 | 2013-08-28 | 上海飞博激光科技有限公司 | Cladding light filtering structure and manufacturing method thereof |
| CN105068181A (en) * | 2015-08-28 | 2015-11-18 | 清华大学 | Optical fiber cladding optical filter and manufacturing method thereof |
| CN105428974A (en) * | 2015-12-01 | 2016-03-23 | 中电科天之星激光技术（上海）有限公司 | Method for filtering cladding light in optical fiber by glass powder |
| CN107272124A (en) * | 2017-07-19 | 2017-10-20 | 深圳市创鑫激光股份有限公司 | The cladding light stripper and preparation method of a kind of high-power laser optical fiber |
| CN107515472A (en) * | 2017-09-30 | 2017-12-26 | 四川思创优光科技有限公司 | Novel multimode pumping optical fiber combiner and manufacturing method thereof |
| CN213814030U (en) * | 2020-11-19 | 2021-07-27 | 上海飞博激光科技有限公司 | Structure for filtering specific cladding light of optical fiber |
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Country or region after: China Address after: 201821 room j2018, building 6, No. 1288, Yecheng Road, Jiading District, Shanghai Applicant after: Shanghai Feibo Laser Technology Co.,Ltd. Address before: 201821 room j2018, building 6, No. 1288, Yecheng Road, Jiading District, Shanghai Applicant before: SHANGHAI FEIBO LASER TECHNOLOGIES Co.,Ltd. Country or region before: China |