CN101556352B - Method for inhibiting propagation of energy-transmitting optical fibers at cladding mode - Google Patents
Method for inhibiting propagation of energy-transmitting optical fibers at cladding mode Download PDFInfo
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- CN101556352B CN101556352B CN2009100668159A CN200910066815A CN101556352B CN 101556352 B CN101556352 B CN 101556352B CN 2009100668159 A CN2009100668159 A CN 2009100668159A CN 200910066815 A CN200910066815 A CN 200910066815A CN 101556352 B CN101556352 B CN 101556352B
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Abstract
The invention relates to a method for inhibiting propagation of energy-transmitting optical fibers at cladding mode, belonging to the technical field of laser. The prior art in the field is difficult to effectively inhibit the laser propagation of the energy-transmitting optical fibers at the cladding mode and can damage the energy-transmitting optical fibers caused by absorption of a coating layer of the laser at the cladding mode. Simultaneously, the laser propagation at the cladding mode also reduces the quality of light beam which is output by the optical fiber coupled laser. The method removes the coating layer at one section of length of an optical fiber input end and then roughens the outer surface of the cladding layer, thereby increasing the propagation loss of the laser at the cladding mode, leading the laser at the cladding mode not to propagate effectively and effectively improving the performance of the energy-transmitting optical fibers. The method can be applied in the manufacture of a variety of energy-transmitting optical fiber connectors.
Description
Technical field
The present invention relates to a kind of method that suppresses propagation of energy-transmitting optical fibers at cladding mode, belong to laser technology field.
Background technology
Energy-transmission optic fibre is mainly used in transmission laser beam of power more than tens watts, has advantages such as easy to use, long transmission distance, loss are little, and the method that generally adopts lens compression light beam size imports energy-transmission optic fibre with the output beam coupling of laser instrument.In order to make the energy-transmission optic fibre input end bear bigger power density and the needs that satisfy joints of optical fibre precision positioning, usually the coat of energy-transmission optic fibre input end one segment length is removed.Because factors such as light source is of poor quality, lens spherical aberration, can make a part of light enter optical fiber and in optical fiber, propagate with cladding mode with angle greater than Optical Fiber Numerical Aperture, this part light has reduced the quality of optic fibre transmision light beam, spot size and beam divergence angle have been increased, this part light can enter optical fiber coating and coated layer absorbs simultaneously, makes the optical fiber heating even burns.Reach the propagation that bigger incident beam numerical aperture Allowance Design is avoided cladding mode in the energy-transmission optic fibre on can be largely by the non-spherical lens that adopts no spherical aberration, have coupling optical system processing difficulties, shortcoming that cost is high, the efficient that bigger incident beam numerical aperture Allowance Design will make the LASER Light Source coupling import energy-transmission optic fibre obviously reduces.
Summary of the invention
The present invention is achieved in that and sees shown in Figure 1ly that energy-transmission optic fibre mainly is made of input end 1, intermediate conveyor section 2, output terminal 3.At first, it is a bit of to adopt physics or chemical method that the optical fiber coating 6 of input end 1 is removed, and the outside surface 7 of fibre cladding 5 is exposed.Then, adopt physical method to make the fibre cladding 5 outside surface roughenings of input end 1, see shown in Figure 3.At last, the energy-transmission optic fibre input end of handling is packed into use in various types of joints of optical fibre.
Technique effect of the present invention is, the outside surface 7 of the fibre cladding 5 that input end 1 exposes makes the loss of cladding mode propagates light greatly increase through after the roughened, thereby cause inciding laser beam in the optical fiber in the very fast decay of input end 1 with wide-angle, effectively suppress cladding mode laser and entered into intermediate conveyor section 2, avoided cladding mode laser to enter the damage that optical fiber coating 6 causes optical fiber coating 6 to cause owing to laser absorption.Simultaneously, also can obviously reduce the cladding mode laser output of fiber-optic output 3, improve the beam quality of optical fiber coupling output.
Embodiment
As shown in Figure 1, energy-transmission optic fibre comprises input end 1, intermediate conveyor section 2, output terminal 3.Input end 1, output terminal 3 have joints of optical fibre interface, make things convenient for being connected of optical fiber and LASER Light Source, applied optics system.The typical cross section structure of energy-transmission optic fibre as shown in Figure 2, fiber core layer 4 is the medium of energy-transmission optic fibre Laser Transmission, the laser of transmission play guide function in 5 pairs of fiber core layers of fibre cladding 4,6 pairs of energy-transmission optic fibres of optical fiber coating shield.To one section energy-transmission optic fibre in the input end 1 carry out that optical fiber coating 6 is removed and the roughened of the outside surface 7 of fibre cladding 5 with the loss of effective increase cladding mode laser, as shown in Figure 3, be input end 1 fibre profile structure along its length.
Below in conjunction with example explanation the present invention, input end 1 is for having the laser coupled input end of SMA905 interface; Intermediate conveyor section 2 is for having the energy-transmission optic fibre of protective casing, and length is 1～2m; Output terminal 3 is for having the laser coupled output terminal of SMA905 interface.The employing concentrated sulphuric acid adds heat soaking or the pulse laser ablation method is carried out the removal of optical fiber coating 6 to the long energy-transmission optic fibre of 50mm in the optic fibre input end 1, adopt 800 order abrasive paper for metallograph that fibre cladding 5 exposed outside surfaces 7 are carried out frosted and handle, assemble the SMA905 joints of optical fibre then.The numerical aperture of energy-transmission optic fibre (NA) is 0.22, adopting with the fiber end face normal becomes the collimated laser beam of 15 degree to be coupled into input end 1, do not observe obvious laser output at output terminal 3, illustrate that incident laser handles the interface diffuse reflection takes place owing to the frosted of the outside surface 7 of covering 5 when input end 1 is propagated with cladding mode, cause cladding mode laser in input end 1 total loss.
Claims (1)
1. method that suppresses propagation of energy-transmitting optical fibers at cladding mode, it is characterized in that, this method comprises the removal of energy-transmission optic fibre laser input end (1) coat (6), the roughened of covering (5) outside surface, adopt chemistry or physical method that the coat (6) of energy-transmission optic fibre laser input end (1) is removed 10～50 millimeters long, covering (5) outside surface of energy-transmission optic fibre is exposed, adopt physical method that covering (5) outside surface that energy-transmission optic fibre laser input end (1) exposes is carried out roughened, making the roughness of covering (5) outside surface of exposure is 0.5～10 micron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100668159A CN101556352B (en) | 2009-04-14 | 2009-04-14 | Method for inhibiting propagation of energy-transmitting optical fibers at cladding mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009100668159A CN101556352B (en) | 2009-04-14 | 2009-04-14 | Method for inhibiting propagation of energy-transmitting optical fibers at cladding mode |
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| Publication Number | Publication Date |
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| CN101556352A CN101556352A (en) | 2009-10-14 |
| CN101556352B true CN101556352B (en) | 2010-12-29 |
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| CN2009100668159A Expired - Fee Related CN101556352B (en) | 2009-04-14 | 2009-04-14 | Method for inhibiting propagation of energy-transmitting optical fibers at cladding mode |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012147688A1 (en) * | 2011-04-28 | 2012-11-01 | 住友電気工業株式会社 | Optical fiber cable |
| CN102928921B (en) * | 2012-10-16 | 2014-06-11 | 北京国科世纪激光技术有限公司 | Optical fiber structure for high-power coupling |
| CN103278892B (en) * | 2013-05-30 | 2015-07-08 | 北京凯普林光电科技有限公司 | Optical connector |
| JP6320761B2 (en) * | 2014-01-14 | 2018-05-09 | 住友重機械工業株式会社 | Neutron beam detection device and neutron capture therapy device |
| CN104901148A (en) * | 2014-03-03 | 2015-09-09 | 无锡源清创业投资有限公司 | Optical fiber cladding light filtering method based on surface crystallization |
| CN108513822A (en) * | 2018-03-21 | 2018-09-11 | 华南理工大学 | A kind of energy-conserving plant culturing rack |
| CN114325947B (en) * | 2021-12-30 | 2024-01-05 | 光惠（上海）激光科技有限公司 | Mode optimization output device based on tapered optical fiber |
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| CN1048700C (en) * | 1995-03-17 | 2000-01-26 | 中国建筑材料科学研究院 | Manufacture method for ultraviolet laser transfer optical fiber prefabricated bar |
| CN101394059A (en) * | 2008-11-05 | 2009-03-25 | 中国科学院上海光学精密机械研究所 | Inner cavity frequency doubling blue light fiber laser |
| CN201218851Y (en) * | 2008-03-20 | 2009-04-08 | 中国电子科技集团公司第二十三研究所 | Optical fiber fusion connection point fixing device |
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2009
- 2009-04-14 CN CN2009100668159A patent/CN101556352B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048700C (en) * | 1995-03-17 | 2000-01-26 | 中国建筑材料科学研究院 | Manufacture method for ultraviolet laser transfer optical fiber prefabricated bar |
| CN201218851Y (en) * | 2008-03-20 | 2009-04-08 | 中国电子科技集团公司第二十三研究所 | Optical fiber fusion connection point fixing device |
| CN101394059A (en) * | 2008-11-05 | 2009-03-25 | 中国科学院上海光学精密机械研究所 | Inner cavity frequency doubling blue light fiber laser |
Non-Patent Citations (3)
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