CN105449499A - Filtering method for optical fiber cladding layer light by utilizing waveguide capillary - Google Patents
Filtering method for optical fiber cladding layer light by utilizing waveguide capillary Download PDFInfo
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- CN105449499A CN105449499A CN201510924132.8A CN201510924132A CN105449499A CN 105449499 A CN105449499 A CN 105449499A CN 201510924132 A CN201510924132 A CN 201510924132A CN 105449499 A CN105449499 A CN 105449499A
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Abstract
The invention discloses a filtering method for optical fiber cladding layer light by utilizing waveguide capillary. The filtering method is characterized by comprising the steps of peeling off a section of an optical fiber with to-be-filtered cladding layer light until an inner cladding layer is exposed; sleeving the inner cladding layer with the waveguide capillary, wherein the refractive index of the waveguide capillary is not less than that of the inner cladding layer; enabling a part of the waveguide capillary to be smelted and shrunk on the inner cladding layer through a heating manner, and enabling the waveguide capillary to be tightly combined with the inner cladding layer; and finally cooling the inner cladding layer and the waveguide capillary. According to the filtering method for the optical fiber cladding layer light by utilizing the waveguide capillary provided by the invention, the residual cladding layer light in the optical fiber can be led out without reducing the signal laser power of the optical fiber core and without generating laser signal self excitation nor generating heat accumulation on the optical fibers.
Description
Technical field
The present invention relates to a kind of filtering method of fiber cladding light, particularly relate to a kind of fiber cladding light filtering method utilizing waveguide capillary.
Background technology
Along with the development of high-capacity optical fiber laser, the power output of fiber laser constantly promotes.Utilize the fiber cladding light filtering method of waveguide capillary to be the important technology of development needed for high-capacity optical fiber laser, the method can improve the beam quality of fiber laser Output of laser, laser brightness and performance reliability.The main method that current fiber cladding light divests is by arranging a refractive index matching layers or use other physics, chemical means by inner cladding surface roughening outside the inner cladding of doubly clad optical fiber, destroy pump light and the total reflection condition of covering laser in the inner cladding of doubly clad optical fiber, thus by these light-output inner claddings, then by this section of optical fiber by heat sink heat radiation or to be sealed in metal shell water flowing cooling.But the major defect of said method is:
1, because current most products uses colloid refractive index matching layers, it has certain absorption for needing the optical wavelength of filtering, causes matching layer to occur the phenomenon of heating burnout.
2, because refractive index matching layers contacts with lighttight heat abstractor, the cladding light of derivation is converted into heat rapidly, and optical fiber local temperature can be caused to raise.Along with the cladding light power needing to divest increases, heat abstractor effectively can not reduce fiber optic temperature, will cause the appearance of the problem such as optical fiber brittle failure, coat burning.
3, by after the surface roughening of optical fiber, not only the mechanical strength of optical fiber reduces, and is chronically exposed in external environment condition due to the inner cladding of optical fiber, can reduce reliability and the useful life of optical fiber.
Therefore, in order to solve the major defect in said method, be necessary to provide a kind of new fiber cladding light filtering method.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of fiber cladding light filtering method utilizing waveguide capillary, can not reduce the signal laser power in fiber core, and not accumulated heat, rapid heat dissipation.
The present invention solves the problems of the technologies described above the technical scheme adopted to be to provide a kind of fiber cladding light filtering method utilizing waveguide capillary, it is characterized in that, comprises the steps:
Utilize a fiber cladding light filtering method for waveguide capillary, it is characterized in that, comprise the steps:
A) will treat that the optical fiber 1 of filtering cladding light divests one section to exposing inner cladding 10;
B) the transparent waveguide capillary 2 refractive index being not less than inner cladding 10 is enclosed within outside described inner cladding, and makes the molten contracting of a part for waveguide capillary 2 on described inner cladding 10 by the method for heating, combines closely with described inner cladding 10.
Further, described waveguide capillary 2 comprises transmitted light exit facet 20, reverberation exit facet 21 and leak light exit facet 22; Respectively described transmitted light exit facet 20 and reverberation exit facet 21 are polished, polishing or carry out plating anti-reflection film process to improve the transmission of described transmitted light exit facet 20 and reverberation exit facet 21.
Further, carry out surface groove, hollow out, punching or corrosion treatment to described leak light exit facet 22, the degree of depth of process is less than the thickness of described waveguide capillary 2, or described leak light exit facet 22 is polished, polishing-.
Further, the transmitted light exit facet 20 of described waveguide capillary 2 in the axial direction with treat the optical fiber 1 of filtering cladding light do not divest part distance D be greater than 0.5cm; And the partial waveguide capillary 2 near transmitted light exit facet 20 does not carry out adding hot melt contracting process, makes the waveguide capillary 2 of this part not fit tightly with inner cladding 10.
Further, the angle of wedge process suppressing interface Fresnel reflection is carried out to described transmitted light exit facet 20.
Preferably, described waveguide capillary 2 is quartz, doped-glass, Pyrex.
Further, the step described inner cladding (10) and described waveguide capillary tube (2) cooled by servicing unit is also comprised.
Preferably, described servicing unit is metal shell, the light absorption that receiving optical fiber and light leak waveguide capillary
Material, heat sink material and cooling liquid.
The present invention brings following beneficial effect:
Pump light residual in fiber cladding, amplified spontaneous emission light, higher order mode signal and the light from exit end reflection can be derived from the inner cladding of optical fiber, the light of then deriving directly is launched by outer field waveguide capillary, heat can not be converted to, avoid the rising of temperature, and the signal laser power that can not reduce in fiber core, or produce laser signal self-excitation.The fiber cladding light filter that the present invention prepares have not accumulated heat, rapid heat dissipation, do not need water-cooled, volume little, cost is lower, compact conformation, be convenient to install feature.
The present invention can be widely used in various high-capacity optical fiber laser and amplifier.
Accompanying drawing explanation
Fig. 1 is a kind of structure diagram utilizing the fiber cladding light filtering method of waveguide capillary to prepare of the present invention;
Fig. 2 is the cladding light transmission path schematic diagram of the embodiment of the present invention 1;
Fig. 3 is the cladding light transmission path schematic diagram of the embodiment of the present invention 2.
In figure:
1: optical fiber 10: inner cladding 11: fibre core
2: waveguide capillary 20: transmitted light exit facet 21: reverberation exit facet
22: leak light exit facet
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is a kind of structure diagram utilizing the fiber cladding light filtering method of waveguide capillary to prepare of the present invention;
Fig. 2 is the cladding light transmission path schematic diagram of the embodiment of the present invention 1;
Fig. 3 is the cladding light transmission path schematic diagram of the embodiment of the present invention 2.
Refer to Fig. 1, a kind of fiber cladding light filtering method utilizing waveguide capillary provided by the invention, no matter comprise the steps: that optical fiber is double clad, triple clad or multi-clad, first will treat that the optical fiber 1 of filtering cladding light divests one section to exposing inner cladding 10; Then selective refraction rate is not less than the transparent waveguide capillary 2 of inner cladding 10, and the material of this waveguide capillary 2 can be quartz, doped-glass or Pyrex.Waveguide capillary 2 is enclosed within outside inner cladding 10, and the mode being melted contracting by high-temperature heating is contracted molten for a part for waveguide capillary tube 2 on inner cladding 10, combines closely form void-free connection with inner cladding 10.Finally inner cladding 10 and waveguide capillary 2 are cooled, specifically the optical fiber 1 treating filtering cladding light after parcel can be placed in metallic packaging block and be dispelled the heat by heat abstractor, or cool at the optical fiber that emergent light comparatively concentrates place's placement cooling liquid or light absorbing material to treat filtering cladding light, thus improve cladding light filtering ability.
The fibre core 11 of optical fiber 1 and inner cladding 10 form the waveguiding structure that constraint laser signal is propagated jointly.Wherein, flashlight transmits in fibre core 11, and the light of residual pump light, amplified spontaneous emission light, higher order mode signal transmits in inner cladding 10.The refractive index of waveguide capillary 2 is less than inner cladding 10, so can destroy total reflection condition, and the light-output that inner cladding 10 is transmitted is in waveguide capillary 2.
Waveguide capillary 2 has transmitted light exit facet 20, reverberation exit facet 21 and leak light exit facet 22.After waveguide capillary 2 is combined with inner cladding 10, transmitted light exit facet 20 in the axial direction with treat that the distance D of the part that the optical fiber 1 of filtering cladding light does not divest is greater than 0.5 centimetre, avoid from the light of transmitted light exit facet 20 outgoing make to treat filtering cladding light optical fiber 1 heating cause burning; And the partial waveguide capillary 2 near transmitted light exit facet 20 does not carry out adding hot melt contracting process, the waveguide capillary 2 of this part is not fitted tightly with inner cladding 10, be transmitted to prevent transmission light directly enter the optical fiber 1 treating filtering cladding light after light-emitting face 20 reflects fibre core 11 in cause self-excitation to shake.For the partial waveguide capillary 2 near reverberation exit facet 21 then without this requirement, it can select to add hot melt contracting process, also can select not add hot melt contracting.
Transmitted light exit facet 20 and reverberation exit facet 21 are polished, polishing to be to improve the transmission of transmitted light exit facet and reverberation exit facet.The anti-reflection film being applicable to inner cladding wavelength can also be plated on transmitted light exit facet 20 and reverberation exit facet 21, to reach the object increasing transmission simultaneously.Transmitted light exit facet 20 can also carry out the angle of wedge process suppressing interface Fresnel reflection.
To leak light exit facet 22 can pass through surface groove, hollow out, punching or corrosion process to improve the divergence speed of transmission light, or carry out polishing, polishing to be to improve transmission.Specifically can see embodiment 1 and embodiment 2.
Embodiment 1:
Refer to Fig. 2, a kind of fiber cladding light filtering method utilizing waveguide capillary provided by the invention, leakage light-emitting face 22 is processed, processing mode is surface groove, hollow out, punching or corrosion, the degree of depth of process is less than the thickness of waveguide capillary 2, so distributes from waveguide capillary 2 to accelerate cladding light.Processing the groove of rear formation, the shape of hole and position distribution to leakage light-emitting face 22 is not limited to shown in Fig. 2, carry out the opening of the groove, hole etc. formed after processing, cross section can be any shape, and the direction of opening and angle of inclination can be any direction and angle; Position distribution can be along optical fiber direction at equal intervals or changing distance distribution, also can be form axial symmetry or asymmetric distribution on cross section of optic fibre, or even random distribution.
Specifically, when the cladding light of transmission in inner cladding 10 has touched waveguide capillary 2, guided-wave conditions becomes waveguide capillary 2 by original inner cladding 10.In transmitting procedure, because the leakage light-emitting face 22 contacted with environment facies processes, after cladding light encounters waveguide capillary 2, can be dispersed into faster outside inner cladding 10 by leakage light-emitting face 22 and go.And in inner cladding 10 light of remaining small value aperture by transmitted light exit facet 20 outgoing, or by reveal light-emitting face 22, transmitted light exit facet 20 reflect after by reverberation exit facet 21 outgoing, diffuse to outside inner cladding 10 and go.
Embodiment 2:
Refer to Fig. 3, a kind of fiber cladding light filtering method utilizing waveguide capillary provided by the invention, leakage light-emitting face 22 is processed, processing mode is polishing, polishing, make waveguide capillary 2 have similar transmission conditions to inner cladding 11, the transmission light that can retrain in inner cladding 10 resumes defeated at waveguide capillary 2 relaying.
Specifically, when the cladding light of transmission in inner cladding 10 has touched waveguide capillary 2, guided-wave conditions becomes waveguide capillary 2 by original inner cladding 10.In transmitting procedure, because the leakage light-emitting face 22 contacted with environment facies has carried out polishing or polishing, therefore the cladding light transmitted cannot be dispersed into external environment condition by revealing light-emitting face 22, and that can be decided cladding light in optical fiber by the area ratio between selective transmission light-emitting face 20 and the cross section of reverberation exit facet 21 and inner cladding 10 divests ratio.Further, after selecting area ratio, part has to be needed by the cladding light of numerical aperture that divests by transmitted light exit facet 20 outgoing, or by reverberation exit facet 21 outgoing after being reflected by transmitted light exit facet 20, diffuse in environment, can realize divesting cladding light in required ratio by said method.
In sum, the pump light remained in optical fiber, amplified spontaneous emission light, higher order mode signal and the light from exit end reflection can be derived by the present invention from the inner cladding of optical fiber, and the signal laser power that can not reduce in fiber core, can not produce laser signal self-excitation or produce heat accumulation on optical fiber.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (8)
1. utilize a fiber cladding light filtering method for waveguide capillary, it is characterized in that, comprise the steps:
A) will treat that the optical fiber (1) of filtering cladding light divests one section to exposing inner cladding (10);
B) the transparent waveguide capillary (2) refractive index being not less than inner cladding (10) is enclosed within outside described inner cladding, and make the molten contracting of a part for waveguide capillary (2) on described inner cladding (10) by the method for heating, combine closely with described inner cladding (10).
2. according to a kind of fiber cladding light filtering method utilizing waveguide capillary according to claim 1, it is characterized in that, described waveguide capillary (2) comprises transmitted light exit facet (20), reverberation exit facet (21) and leak light exit facet (22); Respectively described transmitted light exit facet (20) and reverberation exit facet (21) are polished, polishing or carry out plating anti-reflection film process to improve the transmission of described transmitted light exit facet (20) and reverberation exit facet (21).
3. according to a kind of fiber cladding light filtering method utilizing waveguide capillary according to claim 2, it is characterized in that, surface groove, hollow out, punching or corrosion treatment are carried out to described leak light exit facet (22), the degree of depth of process is less than the thickness of described waveguide capillary (2), or described leak light exit facet (22) is polished, polishing.
4. according to a kind of fiber cladding light filtering method utilizing waveguide capillary described in Claims 2 or 3, it is characterized in that, the transmitted light exit facet (20) of described waveguide capillary (2) in the axial direction with treat that the distance (D) that the optical fiber (1) of filtering cladding light does not divest part is greater than 0.5cm; And the partial waveguide capillary (2) near transmitted light exit facet (20) does not carry out adding hot melt contracting process, makes the waveguide capillary (2) of this part not fit tightly with inner cladding (10).
5. according to a kind of fiber cladding light filtering method utilizing waveguide capillary according to claim 4, it is characterized in that, the angle of wedge process suppressing interface Fresnel reflection is carried out to described transmitted light exit facet (20).
6., according to a kind of fiber cladding light filtering method utilizing waveguide capillary according to claim 5, it is characterized in that, described waveguide capillary (2) is quartz, doped-glass, Pyrex.
7., according to a kind of fiber cladding light filtering method utilizing waveguide capillary according to claim 6, it is characterized in that, also comprise the step described inner cladding (10) and described waveguide capillary tube (2) cooled by servicing unit.
8. according to a kind of fiber cladding light filtering method utilizing waveguide capillary according to claim 7, it is characterized in that, described servicing unit is that receiving optical fiber and light leak the metal shell of waveguide capillary, light absorbing material, heat sink material and cooling liquid.
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| CN201510924132.8A CN105449499B (en) | 2015-12-11 | 2015-12-11 | A kind of fibre cladding light filtering method using waveguide capillary |
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| CN105449499B CN105449499B (en) | 2019-05-17 |
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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 |
| CN106019476A (en) * | 2016-07-14 | 2016-10-12 | 华中科技大学 | Optical fiber cladding optical power stripper and quartz casing thereof |
| CN107290823A (en) * | 2016-04-01 | 2017-10-24 | 中国兵器装备研究院 | A kind of manufacture method of cladding light stripper |
| CN107359496A (en) * | 2016-04-01 | 2017-11-17 | 三菱电线工业株式会社 | Mode stripper constructs and constructed using the mode stripper transmission method of the laser carried out |
| CN107870388A (en) * | 2016-09-27 | 2018-04-03 | 福州高意光学有限公司 | A kind of optical texture for eliminating fibre cladding laser |
| CN110582713A (en) * | 2017-04-28 | 2019-12-17 | 株式会社藤仓 | Cladding mode stripper |
| CN111129921A (en) * | 2019-05-10 | 2020-05-08 | 杭州奥创光子技术有限公司 | Fiber cladding light filter based on femtosecond ablation and use method thereof |
| CN111290086A (en) * | 2020-02-25 | 2020-06-16 | 尚华 | Medical optical fiber guide wire converter |
| EP3584616A4 (en) * | 2017-02-14 | 2020-12-02 | Furukawa Electric Co., Ltd. | Semiconductor laser module |
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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 |
| CN106019476A (en) * | 2016-07-14 | 2016-10-12 | 华中科技大学 | Optical fiber cladding optical power stripper and quartz casing thereof |
| CN107870388A (en) * | 2016-09-27 | 2018-04-03 | 福州高意光学有限公司 | A kind of optical texture for eliminating fibre cladding laser |
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| US11031746B2 (en) | 2017-02-14 | 2021-06-08 | Furukawa Electric Co., Ltd. | Semiconductor laser module |
| CN110582713B (en) * | 2017-04-28 | 2020-12-18 | 株式会社藤仓 | Cladding mode stripper |
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| CN111290086A (en) * | 2020-02-25 | 2020-06-16 | 尚华 | Medical optical fiber guide wire converter |
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