CN104749694A - Optical fiber mode stripper and manufacturing method thereof - Google Patents
Optical fiber mode stripper and manufacturing method thereof Download PDFInfo
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- CN104749694A CN104749694A CN201510145877.4A CN201510145877A CN104749694A CN 104749694 A CN104749694 A CN 104749694A CN 201510145877 A CN201510145877 A CN 201510145877A CN 104749694 A CN104749694 A CN 104749694A
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- optical fiber
- inner cladding
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- 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
- G02B6/245—Removing protective coverings of light guides before coupling
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Abstract
The invention discloses an optical fiber mode stripper. The optical fiber mode stripper comprises an input end, an output end and an attenuation area. The input end comprises a first fiber core, a first inner cladding layer and a first outer cladding layer. The output end comprises a second fiber core, a second inner cladding layer and a second outer cladding layer. The attenuation area comprises a third fiber core and a third inner cladding layer. The third fiber core is connected between the first fiber core and the second fiber core, and the third inner cladding layer is connected between the first inner cladding layer and the second inner cladding layer and exposed between the first outer cladding layer and the second outer cladding layer. A plurality of grooves are formed in the third inner cladding layer and formed by extending along the circumferential direction of the third inner cladding layer. The invention further discloses a manufacturing method of the optical fiber mode stripper. The optical fiber mode stripper has the advantages that pump light output by an optical fiber laser device can be attenuated effectively, transmitting quality of the laser in an optical fiber is improved, output power of the optical fiber laser device is increased, and output quality of the optical fiber laser device is improved.
Description
Technical field
The present invention relates to fiber laser field, particularly relate to the method for making of a kind of optical fiber mode stripper and optical fiber mode stripper.
Background technology
Fiber laser all adopts doubly clad optical fiber to make, and pump light mainly transmits in inner cladding, and in transmitting procedure, is coupled to fibre core and is absorbed and in fibre core, form new laser.This pump mode, pump light decay is in a fiber a kind of exponential model, after pump light decays to a certain degree, increases the output power that fiber lengths not only effectively can not improve fiber laser, but also can increase cost.Therefore, the length of Active Optical Fiber selects to there is optimum value, but the Active Optical Fiber of finite length means that part pump light can not be become useless light by absorbing.Destroy if this part useless pump light continues to propagate in a fiber often to produce subsequent device, and then become harmful light, particularly to high-capacity optical fiber laser, the power of residual pump light is often very high, its destruction is also very large, therefore, fiber laser must adopt an effective measure by this part residual pump light reveal fall.
Summary of the invention
The object of the present invention is to provide a kind of optical fiber mode stripper, can effective attenuation fiber laser export pump light, avoid pump light to cause damage to other optical device, and improve laser transmission quality in a fiber.
In order to solve the problems of the technologies described above, the invention provides a kind of optical fiber mode stripper, it comprises input end, output terminal and attenuation region.Described input end comprises the first fibre core, the first inner cladding and the first surrounding layer.Described output terminal comprises the second fibre core, the second inner cladding and the second surrounding layer.Described attenuation region comprises the 3rd fibre core and the 3rd inner cladding.Described 3rd fibre core is connected between described first fibre core and described second fibre core, described 3rd inner cladding is connected between described first inner cladding and described second inner cladding, and described 3rd inner cladding is exposed between described first surrounding layer and described second surrounding layer.Described 3rd inner cladding is provided with multiple groove, and groove described in each extends to form along the circumferential direction of described 3rd inner cladding.
Wherein, multiple described groove equidistantly distributes along the axial direction of described 3rd inner cladding or the axial direction of distance from described input end and along described 3rd inner cladding between every two adjacent described grooves reduces gradually.
Wherein, groove described in each ringwise or twist.
Wherein, described attenuation region is cone.
Wherein, the heat-conducting medium on described 3rd inner cladding surface is any one in air, water, heat-conducting silicone grease three kinds of heat-conducting mediums.
Wherein, the degree of depth of groove described in each adjusts according to the degree of optical power attenuation.
Wherein, also comprise metal shell and heating radiator, described attenuation region is packaged in described metal shell, and described metal shell is located at described heating radiator.
Another object of the present invention is the method for making providing a kind of optical fiber mode stripper, and described optical fiber mode stripper comprises input end, output terminal and attenuation region.The method for making of described optical fiber mode stripper comprises: doubly clad optical fiber is divided into front end, rear end and is located at the zone line between described front end and described rear end, described front end forms the input end of described optical fiber mode stripper, and described rear end forms the output terminal of described optical fiber mode stripper; The surrounding layer of described zone line is peeled off and is made the inner cladding of described zone line exposed; And adopt laser instrument to form multiple groove at described exposed inner cladding, thus make described zone line form the attenuation region of described optical fiber mode stripper, groove described in each extends to form along the circumferential direction of described exposed inner cladding.
Wherein, described employing laser instrument forms multiple groove at described exposed inner cladding, thus the step making described zone line form the attenuation region of described optical fiber mode stripper comprises: described laser instrument transmitted beam; Catoptron reflects described light beam; Condenser lens focuses on the light beam of described reflection and forms focus and act on described exposed inner cladding; And the surface of described exposed inner cladding fusion and gasification under the energy of the light beam of described convergence forms described groove.
Wherein, while described laser instrument transmitted beam, described doubly clad optical fiber rotates along the axis direction of described doubly clad optical fiber.
Optical fiber mode stripper provided by the invention, by making multiple groove on the 3rd inner cladding that attenuation region is exposed, because described groove has scattering process to pump light, thus reaches the object divesting described pump light.Therefore, optical fiber mode stripper provided by the invention, can the pump light that exports of effective attenuation fiber laser, improves the quality of laser transmission in a fiber, thus effectively improves the output power of fiber laser.
The method for making of optical fiber mode stripper provided by the invention, by adopting laser instrument to form groove on the inner cladding of doubly clad optical fiber, method for making is simple, greatly can provide the make efficiency of optical fiber mode stripper.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of the optical fiber mode stripper that the first embodiment of the present invention provides;
Fig. 2 is the light path scattering schematic diagram of the optical fiber mode stripper shown in Fig. 1;
Fig. 3 is the schematic diagram of the optical fiber mode stripper that the second embodiment of the present invention provides;
Fig. 4 is the schematic diagram of the optical fiber mode stripper that the third embodiment of the present invention provides;
Fig. 5 is the schematic diagram by drawing the optical fiber mode stripper shown in cone mode construction drawing 4;
And
Fig. 6 is the schematic diagram adopting laser fabrication optical fiber mode stripper provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in embodiment of the present invention, the technical scheme in embodiment of the present invention is clearly and completely described.
With reference to Fig. 1, it is a kind of optical fiber mode stripper 100 provided in embodiment of the present invention.Described optical fiber mode stripper 100 is located between fiber laser and Laser output optical fiber, and for the pump light of peeling optical fibre laser instrument remnants, what ensure that described fiber laser exports only has laser, to improve the Laser Transmission quality of fiber laser.
Described optical fiber mode stripper 100 comprises input end 10, output terminal 20 and attenuation region 30.Described input end 10 comprises the first fibre core 11, first inner cladding 12 and the first surrounding layer 13.Described output terminal 20 comprises the second fibre core 21, second inner cladding 22 and the second surrounding layer 23.Described attenuation region 30 comprises the 3rd fibre core 31 and the 3rd inner cladding 32, described 3rd fibre core 31 is connected between described first fibre core 11 and described second fibre core 21, described 3rd inner cladding 32 is connected between described first inner cladding 12 and described second inner cladding 22, and described 3rd inner cladding 32 is exposed between described first surrounding layer 13 and described second surrounding layer 23.Described 3rd inner cladding 32 is provided with multiple groove 321, and groove 321 described in each extends to form along the circumferential direction of described 3rd inner cladding 32.
In other words, optical fiber mode stripper 100 of the present invention is peeled off by the surrounding layer of the zone line by doubly clad optical fiber, exposes inner cladding, and form multiple groove 321 at the axial direction of inner cladding, each groove 321 extends along the circumferential direction of inner cladding, to form described attenuation region 30.
Please refer to Fig. 2, the pump light that described fiber laser is not completely absorbed enters the input end 10 of described optical fiber mode stripper 100, and transmits at described first inner cladding 12.Multiple grooves 321 pairs of pump lights on the 3rd inner cladding 32 exposed have scattering process, thus a part of pump light can be leaked to free space from described 3rd inner cladding 32, reaches the object divesting described pump light.Therefore, eliminate the interference of pump light from the laser of described optical fiber mode stripper 100 output terminal 20 output, directly transmitted by optical fiber.
As can be seen here, optical fiber mode stripper 100 provided by the invention, by making multiple groove 321 on the 3rd inner cladding 32 exposed, because described groove 321 pairs of pump lights have scattering process, thus reaches the object divesting described pump light.Therefore, optical fiber mode stripper 100 provided by the invention, can the pump light that exports of effective attenuation fiber laser, improves the quality of laser transmission in a fiber, thus effectively improves output power and the quality of fiber laser.
Meanwhile, optical fiber mode stripper 100 provided by the invention directly processes the structure of doubly clad optical fiber, is attached to optical fiber without the need to introducing other materials, and structure is simple, substantially increases the make efficiency of optical fiber mode stripper 100 and the reliability of long-term work.
In present embodiment, described groove 321 equidistantly distributes along the axial direction of described 3rd inner cladding 32.In other words, the distance between every two adjacent grooves 321 is equal, and multiple described groove 321 forms periodic distribution.
In other embodiments, the distance between every two adjacent described grooves 321 from the input end 10 of described optical fiber mode stripper 100 and the axial direction along described 3rd inner cladding 32 reduce gradually, multiple described groove 321 forms non-periodic distribution.Multiple described groove 321 can realize in non-periodic distribution the object progressively divesting described pump light, thus can effectively control described scattered light.
Optical fiber mode stripper 100 provided by the invention can arrange suitable groove 321 degree of depth, width, spacing and quantity according to the actual requirements, to realize pump light dispersion effect in various degree, thus reaches the object revealed and decay pump energy.Wherein, described in each, the degree of depth of groove 321 adjusts according to the degree of optical power attenuation.
In present embodiment, described groove 321 ringwise.In another embodiment, described groove 321 twist, as shown in Figure 3.
In another embodiment provided by the invention, described attenuation region 30 is cone, as shown in Figure 4, Figure 5.Please refer to Fig. 5, in the present embodiment, attenuation region 30 can be made into cone by drawing cone mode, and this cone surface is the 3rd inner cladding 32, makes groove 321 along cone surface.Draw cone can cause dying down to the limitation capability of pump light, thus be conducive to decaying to pump light further.
By experiment, the angle theta between input light and the normal of the cone surface that draws cone to be formed meets:
During Sin θ≤(N1:N2),
Wherein, N1 is the refractive index of the medium of contact cone surface, and N2 is the refractive index of the 3rd inner cladding 32.The heat-conducting medium of contact cone surface can be air, water, heat-conducting silicone grease etc.The results show, attenuation region 30 is cone and after attenuation region 30 cone surface coated with thermally conductive medium, laser light scattering successful, the attenuation degree of the pump light that fibre laser is exported improves more than 30%, effectively improves laser transmission quality in a fiber.
Please refer to Fig. 1, as a further improvement on the present invention, described optical fiber mode stripper 100 also comprises metal shell 40 and heating radiator 50.Described attenuation region 30 is packaged in described metal shell 40, and described metal shell 40 is located at described heating radiator 50.Described metal shell 40 not only can play the effect protecting described attenuation region 30; the pump light of described scattering is simultaneously transferred to described heating radiator 50 by described metal shell 40; to dispel the heat to the energy of described pump light, thus substantially increase the performance reliability of described optical fiber mode stripper 100.
Present invention also offers the method for making of described optical fiber mode stripper 100, it comprises the following steps.
Step 1, is divided into front end 210, rear end 220 and is located at the zone line 230 of described front end 210 and described rear end 220 by doubly clad optical fiber 200.Described front end 210 forms the input end 10 of described optical fiber mode stripper 100, and described rear end 220 forms the output terminal 20 of described optical fiber mode stripper 100.
Step 2, peels off the surrounding layer of described zone line 230 and makes the inner cladding of described zone line 230 exposed.
Step 3, adopts laser instrument 60 to form multiple groove 321 at described exposed inner cladding, thus makes described zone line 230 form the attenuation region 30 of described optical fiber mode stripper 100.Groove 321 described in each extends to form along the circumferential direction of described exposed inner cladding.In present embodiment, described laser instrument 60 is carbon dioxide laser.In other embodiments, described laser instrument 60 also can be ultraviolet laser.
Please refer to Fig. 6, in present embodiment, described employing laser instrument 60 forms multiple groove 321 at described exposed inner cladding, thus it is as follows to make described zone line 230 form the detailed process of the step of the attenuation region 30 of described optical fiber mode stripper 100:
Described laser instrument 60 transmitted beam 70.Catoptron 80 reflects described light beam 70.Condenser lens 90 focuses on the light beam 70 of described reflection and forms focus and act on described inner cladding.Surface fusion and gasification under the energy of the light beam 70 of described convergence of described inner cladding 32 forms described groove 321.While described carbon dioxide laser 60 transmitted beam 70, described doubly clad optical fiber 200 rotates along the axis direction of described doubly clad optical fiber 200.
In present embodiment, after doubly clad optical fiber 200 rotating 360 degrees, annular groove 321 as shown in Figure 1 can be produced.After processing a groove 321, described doubly clad optical fiber 200 is moved to the left, and the distance of described doubly clad optical fiber 200 movement is the distance of every two adjacent described grooves 321, then adopts the method for above-mentioned steps 3 to process next groove 321.Circulate with this, described multiple groove 321 can be formed.
In present embodiment, by regulating laser instrument 60 laser energy to control the depth of groove 321, and then control the power of groove 321 pairs of pump light scatterings, thus accurately can control the degree of depth and the effect of shelling mould.
In other embodiments, the method making spiral groove 321 is substantially identical with the method making annular groove 321, difference is only, when making spiral groove 321, the translation motion of doubly clad optical fiber 200 and the rotation in the axial direction of doubly clad optical fiber 200 can be carried out simultaneously, thus the groove 321 carved twist.By controlling the speed of doubly clad optical fiber 200 translation and rotation, the cycle of spiral can be controlled.By controlling the energy of carbon dioxide laser 60, the degree of depth of groove 321 can be controlled.
As can be seen here, the method for making of optical fiber mode stripper 100 provided by the invention, by adopting laser instrument 60 to form groove 321 on the inner cladding of doubly clad optical fiber 200, method for making is simple, greatly can provide the make efficiency of optical fiber mode stripper 100.
The above is the preferred embodiment of the present invention; it should be pointed out that the those of ordinary skill for this technical feature field, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. an optical fiber mode stripper, comprise input end, output terminal and attenuation region, it is characterized in that, described input end comprises the first fibre core, first inner cladding and the first surrounding layer, described output terminal comprises the second fibre core, second inner cladding and the second surrounding layer, described attenuation region comprises the 3rd fibre core and the 3rd inner cladding, described 3rd fibre core is connected between described first fibre core and described second fibre core, described 3rd inner cladding is connected between described first inner cladding and described second inner cladding, described 3rd inner cladding is exposed between described first surrounding layer and described second surrounding layer, described 3rd inner cladding is provided with groove, multiple described groove extends along the circumferential direction of described 3rd inner cladding.
2. optical fiber mode stripper according to claim 1, it is characterized in that, every two adjacent described grooves reduce gradually along the axial direction of distance from described input end and along described 3rd inner cladding between the distribution of axial direction equidistance or every two adjacent described grooves of described 3rd inner cladding.
3. optical fiber mode stripper according to claim 1, is characterized in that, described groove ringwise or twist.
4. optical fiber mode stripper according to claim 1, is characterized in that, described attenuation region is cone.
5. optical fiber mode stripper according to claim 1, is characterized in that, the heat-conducting medium on described 3rd inner cladding surface is any one in air, water, heat-conducting silicone grease.
6. optical fiber mode stripper according to claim 1, is characterized in that, the degree of depth of described groove, width, spacing and quantity all adjust according to the degree of optical power attenuation.
7. optical fiber mode stripper according to claim 1, is characterized in that, also comprises metal shell and heating radiator, and described attenuation region is packaged in described metal shell, and described metal shell is located at described heating radiator.
8. a method for making for optical fiber mode stripper, described optical fiber mode stripper comprises input end, output terminal and attenuation region, it is characterized in that, the method for making of described optical fiber mode stripper comprises:
Doubly clad optical fiber is divided into front end, rear end and is located at the zone line between described front end and described rear end, described front end forms the input end of described optical fiber mode stripper, and described rear end forms the output terminal of described optical fiber mode stripper;
Being peeled off by the surrounding layer of described zone line makes the inner cladding of described zone line exposed; And
Adopt laser instrument to form multiple groove at described exposed inner cladding, thus make described zone line form the attenuation region of described optical fiber mode stripper, groove described in each extends to form along the circumferential direction of described exposed inner cladding.
9. the method for making of optical fiber mode stripper according to claim 8, is characterized in that, described employing laser instrument forms multiple groove at described exposed inner cladding, thus the step making described zone line form the attenuation region of described optical fiber mode stripper comprises:
Described laser instrument transmitted beam;
Catoptron reflects described light beam;
Condenser lens focuses on the light beam of described reflection and forms focus and act on described exposed inner cladding; And
Surface fusion and gasification under the energy of the light beam of described convergence of described exposed inner cladding forms described groove.
10. the method for making of optical fiber mode stripper according to claim 9, is characterized in that, while described laser instrument transmitted beam, described doubly clad optical fiber rotates along the axis direction of described doubly clad optical fiber.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105676354A (en) * | 2016-04-13 | 2016-06-15 | 昆山华辰光电科技有限公司 | Novel high-power fiber mode stripper capable of polishing and grinding lateral side of fiber |
| CN107425404A (en) * | 2017-05-19 | 2017-12-01 | 大族激光科技产业集团股份有限公司 | The processing method of cladding light stripper |
| CN108152882A (en) * | 2018-02-01 | 2018-06-12 | 北京交通大学 | A kind of side emitting optical fiber with spiral grooves and preparation method thereof |
| KR101871996B1 (en) | 2016-09-27 | 2018-07-02 | 주식회사 라이콤 | Clading mode stripper and fiber laser using the same |
| CN109768459A (en) * | 2019-02-14 | 2019-05-17 | 深圳市鹏星光电科技有限公司 | A kind of pump light stripper of laser ablation and preparation method thereof |
| CN110412691A (en) * | 2019-09-06 | 2019-11-05 | 珠海光库科技股份有限公司 | Collimator and laser |
| US20200099190A1 (en) * | 2018-09-21 | 2020-03-26 | Nlight, Inc. | Optical fiber cladding light stripper |
| US11808973B2 (en) | 2018-09-10 | 2023-11-07 | Nlight, Inc. | Optical fiber splice encapsulated by a cladding light stripper |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105676354A (en) * | 2016-04-13 | 2016-06-15 | 昆山华辰光电科技有限公司 | Novel high-power fiber mode stripper capable of polishing and grinding lateral side of fiber |
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| US11808973B2 (en) | 2018-09-10 | 2023-11-07 | Nlight, Inc. | Optical fiber splice encapsulated by a cladding light stripper |
| US20200099190A1 (en) * | 2018-09-21 | 2020-03-26 | Nlight, Inc. | Optical fiber cladding light stripper |
| CN112955793A (en) * | 2018-09-21 | 2021-06-11 | 恩耐公司 | Optical fiber cladding light stripper |
| EP3841411A4 (en) * | 2018-09-21 | 2022-06-01 | NLIGHT, Inc. | Optical fiber cladding light stripper |
| US11575239B2 (en) | 2018-09-21 | 2023-02-07 | Nlight, Inc. | Optical fiber cladding light stripper |
| CN109768459A (en) * | 2019-02-14 | 2019-05-17 | 深圳市鹏星光电科技有限公司 | A kind of pump light stripper of laser ablation and preparation method thereof |
| CN110412691A (en) * | 2019-09-06 | 2019-11-05 | 珠海光库科技股份有限公司 | Collimator and laser |
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