CN112213821A - Optical fiber guide type high-power optical fiber cladding optical stripper capable of deeply stripping - Google Patents
Optical fiber guide type high-power optical fiber cladding optical stripper capable of deeply stripping Download PDFInfo
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- CN112213821A CN112213821A CN202011061047.0A CN202011061047A CN112213821A CN 112213821 A CN112213821 A CN 112213821A CN 202011061047 A CN202011061047 A CN 202011061047A CN 112213821 A CN112213821 A CN 112213821A
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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
- G02B6/255—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
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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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- 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
- G02B6/25—Preparing the ends of light guides for coupling, e.g. cutting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- Light Guides In General And Applications Therefor (AREA)
Abstract
The invention discloses a deeply stripped optical fiber guide type high-power optical fiber cladding light stripper, which adopts a novel method of guiding leakage by a plurality of optical waveguides, so that most of leaked cladding light is not accumulated on a double-cladding transmission optical fiber any more, but is transmitted to any place through the optical fiber to be fully radiated and dissipated, the stripping depth of the cladding light stripper is controlled by the diameter of an optical fiber cone body at the output end of the cladding light stripper and the diameter of the leaked light guide optical fiber, and not only residual pump light in the cladding optical fiber can be filtered, but also a high-order laser mode in the cladding optical fiber can be filtered. The invention can be suitable for higher bearing power, and can guide the waste light to any place through the optical fiber, thereby being more convenient for heat management design; meanwhile, the problem of high temperature of the double-clad optical fiber in the traditional stripper is avoided, so that high-power laser transmission in the fiber core and light stripping of the cladding in the cladding are safer and more reliable.
Description
Technical Field
The invention belongs to the technical field of fiber lasers, particularly relates to the field of high-power fiber lasers or high-power fiber laser amplifiers, and particularly relates to a method for efficiently stripping (filtering and leaking) high-power high-order mode lasers and residual cladding pump light in double-cladding transmission fibers of a high-power fiber laser so as to improve the beam quality of laser output by the laser.
Background
With the continuous improvement of the output power level of a single-fiber single-mode high-power fiber laser and the improvement of the application requirement on the beam quality, the fiber core laser power of the high-power fiber laser is higher and higher, and meanwhile, the cladding stripping power is higher and higher, so that the power bearing capacity of the high-power cladding stripper is also challenged greatly.
At present, the methods for filtering residual cladding light and high-order modes of a high-power fiber laser mainly include coating a high refractive index material (U.S. patent No. 4678273), coating a high refractive index material with an improved step structure (chinese patent No. CN104570213A), etching a tapered fiber (documents r. pozesh et al, "a novel method for extruding coated lights in high power fiber lasers and amplifiers" j.lightwave technology.30 (20),3199 and 3202,2012), and side fusion unidirectional guiding filtering method (chinese patent application No. 201510556870.1). The common characteristics of the heat sink and the cladding light stripper are that the residual pump light irradiates on the heat sink, the light energy is converted into heat energy, and the heat on the heat sink is taken away in a water cooling mode, so that the stable operation and the safe work of the cladding light stripper are realized.
However, the existing optical fiber cladding stripper has the problem of high temperature and difficult heat dissipation; when the fiber core bears high-power fiber laser and the cladding light is filtered simultaneously, great risk exists; the power bearing level is also limited, so that the single-mode single-fiber laser with tens of thousands of watts is difficult to deal with, and a new solution is urgently needed.
For a high-power fiber laser of several kilowatts, the filtering function of cladding light is relatively easy, and the common method can be realized. However, as the output power of the fiber laser is higher, higher requirements are placed on the cladding stripper.
Disclosure of Invention
Objects of the invention
The invention aims to provide a deeply stripped fiber-guided high-power fiber cladding light stripper, which is based on the characteristics of cladding light, is different from the existing cladding light stripping scheme, realizes that the filtered cladding light is guided out through an optical fiber, avoids the defects of low efficiency and low bearing power caused by the fact that most of the filtered residual pump light in the existing stripping scheme is firstly converted into heat energy and then dissipated through heat sedimentation, further realizes the stripping of the cladding light with higher power, and directly guides most of the light energy to the outside through the optical fiber, so that the temperature control of the stripper is more convenient, the heat management is more efficient, and meanwhile, the working stability and the reliability of the stripper are higher.
(II) technical scheme
In order to solve the technical problem, the invention provides a deep stripped optical fiber guide type high-power optical fiber cladding stripper, wherein a double-cladding transmission optical fiber with main laser on the left side is set from left to right in the main laser direction, and comprises a left transmission optical fiber core 3, a left transmission optical fiber cladding 2 coated on the left transmission optical fiber core 3 and a left transmission optical fiber coating layer 1 coated on the left transmission optical fiber cladding 2; the right side is the tapered structure that the optic fibre of double-clad fiber and leakage layer light formed through drawing the awl or corroding, including right side transmission fiber core 4, the right side transmission fiber cladding 5 of cladding on right side transmission fiber core 4, and the right side transmission fiber cladding 6 of cladding on right side transmission fiber cladding 5, the left end of tapered structure is right side transmission fiber centrum 7, many cladding light guide fiber are evenly arranged to right side transmission fiber core 4 periphery, every cladding light guide fiber includes cladding light guide fiber bare fiber 8 and cladding light guide fiber coating 9 on cladding light guide fiber bare fiber 8.
The double-cladding transmission fiber of the left main laser is welded with one double-cladding transmission fiber and a plurality of cladding light guide fibers on the right side, the laser in the fiber core 3 of the left transmission fiber is directly coupled into the fiber core 4 of the right transmission fiber, and the residual pump light and the high-order mode in the cladding light are transmitted to any place convenient for heat dissipation through the plurality of cladding light guide fiber bare fibers 8.
Wherein, the right transmission optical fiber cone 7 is manufactured by adopting a hydrofluoric acid etching method.
And the right ends of the left transmission optical fiber cladding 2 and the left transmission optical fiber core 3 form cone ends by an etching method.
The left transmission optical fiber coating layer 1, the left transmission optical fiber cladding layer 2 and the left transmission optical fiber core 3 form a left laser input end, the right transmission optical fiber core 4, the right transmission optical fiber cladding layer 5, the right transmission optical fiber coating layer 6 and the right transmission optical fiber cone 7 form a right laser transmission end, the coating layer is removed from the left laser input end, the end is cut into a plane structure or etched into a conical structure through hydrofluoric acid, the coating layer is removed from the right laser transmission end, and the conical structure is etched through the hydrofluoric acid.
The invention also provides a preparation method of the optical fiber guide type high-power optical fiber cladding stripper for deep stripping, which comprises the following steps:
s1: firstly, cutting a transmission optical fiber into two parts, wherein one part is a left laser input end, and the other part is a right laser transmission end; removing the coating layer from the left laser input end, processing the end into a planar structure or a conical structure, and removing the coating layer from the right laser transmission end into a conical structure;
s2: preparing a plurality of guide optical fibers, removing coating layers of the guide optical fibers, and bundling the guide optical fibers and the right laser transmission end together;
s3: welding the left laser input end with a plurality of guide optical fibers and a cluster cone of the right laser transmission end;
s4: and packaging the optical fiber structure.
In step S1, the end of the left laser input end is cut into a planar structure or etched into a tapered structure by hydrofluoric acid.
In step S1, the right laser transmission end is etched into a tapered structure by hydrofluoric acid.
In step S2, the guide optical fibers are arranged uniformly around the right laser transmission end, and 6 guide optical fibers are arranged around the right laser transmission end.
The stripping depth of the stripper is influenced by the cone structure parameters of the right laser transmission end and the thickness of the guide optical fiber.
(III) advantageous effects
The optical fiber guide type high-power optical fiber cladding light stripper for deep stripping, which is provided by the technical scheme, can realize the stripping of residual pump light and high-order mode laser by guiding the cladding light by the plurality of optical fibers, so that the stripped light is prevented from irradiating on the cladding, or on optical cement, or on an etched frosted surface, and heat is accumulated on the cladding optical fiber to cause local high temperature so as to influence the laser transmission in a fiber core.
Drawings
Fig. 1 is an exploded view of the stripper in both the left and right sides before it is manufactured.
Fig. 2 is an overall configuration view of the stripper.
FIG. 3 is a schematic view of the stripper depth control of the stripper.
FIG. 4 is a schematic diagram of control of the stripping depth of the etched taper of the left double-clad fiber.
FIG. 5 is a schematic diagram of a right double-clad fiber etched taper.
FIG. 6 is a schematic diagram of a right-side clad light-guiding fiber.
In the figure, 1 is a left transmission fiber coating layer, 2 is a left transmission fiber cladding layer, 3 is a left transmission fiber core, 4 is a right transmission fiber core, 5 is a right transmission fiber cladding layer, 6 is a right transmission fiber coating layer, 7 is a right transmission fiber cone, 8 is a cladding light guide fiber bare fiber, 9 is a cladding light guide fiber coating layer, and 10 is a left transmission fiber cone.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The general idea of the invention is to break the traditional leakage concept that the optical cement and etching damage the cladding waveguide structure, and to use a novel method that a plurality of optical waveguides guide leakage, so that most of the leaked cladding light is not accumulated on the double-cladding transmission optical fiber, but is transmitted to any place through the optical fiber to perform sufficient heat dissipation and dissipation, thus being safer and more reliable. Meanwhile, the thermal management of the device is more scientific, and the influence on the main laser when cladding light is leaked by optical cement and an etching method is avoided.
On the whole, the double-clad transmission fiber comprises two parts, wherein the double-clad transmission fiber is set with a main laser direction from left to right and the left side is the main laser, and comprises a left transmission fiber core 3, a left transmission fiber cladding 2 coated on the left transmission fiber core 3 and a left transmission fiber coating layer 1 coated on the left transmission fiber cladding 2; the right side is the tapered structure that the optic fibre of double-clad fiber and leakage layer light formed through drawing the awl or corroding, including right side transmission fiber core 4, the right side transmission fiber cladding 5 of cladding on right side transmission fiber core 4, and the right side transmission fiber cladding 6 of cladding on right side transmission fiber cladding 5, the left end of tapered structure is right side transmission fiber centrum 7, many cladding light guide fiber are evenly arranged to right side transmission fiber core 4 periphery, every cladding light guide fiber includes cladding light guide fiber bare fiber 8 and cladding light guide fiber coating 9 on cladding light guide fiber bare fiber 8.
The double-clad transmission fiber of the left main laser is welded with the double-clad transmission fiber and the cladding light guide fibers on the right as shown in fig. 2, the laser in the fiber core 3 of the left transmission fiber is directly coupled into the fiber core 4 of the right transmission fiber, and the residual pump light and the high-order mode in the cladding light are transmitted to any place convenient for heat dissipation through the cladding light guide fiber bare fibers 8.
The tapered structures formed by tapering or corroding the right double-clad fiber and the fiber with the leakage layer light can be controlled by the diameter of the cone body of the right double-clad fiber in the center and the diameter of the peripheral guide fiber, so that the control of the stripping depth is realized. In the manufacturing of the cone, a hydrofluoric acid etching method is adopted to avoid the waveguide structure change of the fiber core 3 of the left transmission fiber and the fiber core 4 of the right transmission fiber, which further affects the loss and mode change of the main laser, as shown in fig. 3.
The double-clad transmission fiber of the left main laser can also control the cone body through an etching method, so that the numerical apertures of the residual pump light and the high-order mode laser in the left cladding can be restrained, and the left main laser can be guided out through the guide fiber more easily on the right side, as shown in fig. 4.
The high-bearing-power optical fiber cladding residual pump light and high-order mode laser filter avoids the traditional method that optical cement and etching damage the cladding waveguide structure, adopts a novel method that a plurality of optical waveguides guide leakage, ensures that most of leaked cladding light is not accumulated on the double-cladding transmission optical fiber any longer, but is transmitted to any place through the optical fiber to be fully radiated and dissipated, and is safer and more reliable; the stripping depth of the cladding light stripper can be controlled by the diameter of the optical fiber cone at the output end of the cladding light stripper (filter, leakage device) and the diameter of the leakage light guide optical fiber, so that not only can residual pump light in the cladding optical fiber be filtered, but also a high-order laser mode in the cladding optical fiber can be filtered; the diameter of the cladding cone at the input end of the cladding stripper (filter, leakage) can be controlled to control the stripping depth; the clad optical guide fiber can also meet and match the overall stripping effect of the stripper by the design of the diameter and the design of the tapered.
Examples
Aiming at the high-power optical fiber laser cladding light stripping, the invention discloses a novel method for guiding stripping based on the cladding light guide optical fiber, which better realizes high bearing stripping power, avoids the heat accumulation effect on local thin optical fiber, is more scientific and convenient, and has the following specific implementation modes.
Firstly, cutting a transmission optical fiber into two parts, wherein one part is a left laser input end (marked with a label 1-3), and the other part is a right laser transmission end (marked with a label 4-7); wherein, the coating layer is removed from the left laser input end, and the end is cut into a planar structure as shown in fig. 4(a) or etched into a tapered structure by hydrofluoric acid as shown in fig. 4(b), and the embodiment is described by taking the flat end of fig. 4(a) as an example; in addition, the coating layer of the right laser transmission end is removed, and the right laser transmission end is etched into a cone-shaped structure by hydrofluoric acid, as shown in fig. 5.
Several guiding fibers are prepared and then the coating is removed, as shown in fig. 6. The specific number and diameter are designed to match the ablation depth and the specific etched cone profile dimensions. Tapering designs may also be added. Here, 6 guide fibers are taken as an example.
The six guiding fibers and the right laser transmission end are then bundled together as shown in fig. 1.
The left laser input end is then fused to the bundled cones of six guide fibers and the right laser transmission end as shown in fig. 2.
Thus, the preparation of the optical fiber guide type high-power optical fiber cladding stripper is completed, and then the optical fiber structure is packaged through the structure.
The control of the stripping depth of the stripper can be realized by the cone structure control of the right laser transmission end and the thickness or cone structure control of the six guide optical fibers, as shown in figure 3. In the figure, the diameter of the right transmission optical fiber cone 7 and the diameter of the cladding light guide optical fiber bare fiber 8 are changed, so that the stripping depth can be optimized and designed to achieve the expected effect.
Thus, the preparation of the deeply stripped fiber-guided high-power fiber cladding stripper is completed.
According to the technical scheme, the cladding light stripper (the filter or the leakage device) based on the end face tapering is different from the existing cladding light stripping scheme, the filtered cladding light can be guided out through the optical fiber, the defects of low efficiency and low bearing power caused by the fact that most of the filtered residual pump light in the existing stripping scheme is firstly converted into heat energy and then dissipated through heat sink are overcome, the existing scheme can realize higher-power cladding light stripping, most of the light energy is directly guided to the outside through the optical fiber, the temperature control of the stripper is more convenient, the heat management is more efficient, and meanwhile the working stability and the reliability of the stripper are higher. The invention can be suitable for higher bearing power, and can guide the waste light to any place through the optical fiber, thereby being more convenient for heat management design; meanwhile, the problem of high temperature of the double-clad optical fiber in the traditional stripper is avoided, so that high-power laser transmission in the fiber core and light stripping of the cladding in the cladding are safer and more reliable.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The optical fiber guide type high-power optical fiber cladding optical stripper for deep stripping is characterized in that a double-cladding transmission optical fiber with main laser on the left side is set from left to right in the main laser direction and comprises a left transmission optical fiber core (3), a left transmission optical fiber cladding (2) coated on the left transmission optical fiber core (3) and a left transmission optical fiber coating layer (1) coated on the left transmission optical fiber cladding (2); the right side is the tapered structure that the optic fibre of double-clad fibre and leakage layer light formed through drawing the awl or corroding, including right side transmission fiber core (4), right side transmission fiber cladding (5) on right side transmission fiber core (4) of cladding, and right side transmission fiber cladding (6) on right side transmission fiber cladding (5), the left end of tapered structure is right side transmission fiber centrum (7), many cladding light guide fiber are evenly arranged to right side transmission fiber core (4) periphery, every cladding light guide fiber includes cladding light guide fiber bare fiber (8) and cladding light guide fiber coating (9) on cladding light guide fiber bare fiber (8).
2. The deep-stripped fiber-guided high-power fiber cladding stripper according to claim 1, wherein the left main laser double-clad transmission fiber is fusion-spliced with the right double-clad transmission fiber and a plurality of cladding light guide fibers, the laser in the left transmission fiber core (3) is directly coupled into the right transmission fiber core (4), and the residual pump light and high-order modes in the cladding light are transmitted to any place where heat dissipation is convenient through a plurality of cladding light guide fiber bare fibers (8).
3. The deep stripped fiber-guided high power fiber cladding stripper according to claim 2, wherein the right transmission fiber cone (7) is fabricated by hydrofluoric acid etching.
4. The deep stripped fiber-guided high power fiber cladding stripper according to claim 3, wherein the right ends of the left transmission fiber cladding (2) and the left transmission fiber core (3) are tapered by etching.
5. The deep-stripped fiber-guided high-power fiber cladding stripper according to claim 4, wherein the left transmission fiber coating layer (1), the left transmission fiber cladding layer (2) and the left transmission fiber core (3) form a left laser input end, the right transmission fiber core (4), the right transmission fiber cladding layer (5), the right transmission fiber coating layer (6) and the right transmission fiber cone (7) form a right laser transmission end, the left laser input end is stripped of the coating layer and cut into a planar structure or etched into a conical structure by hydrofluoric acid, and the right laser transmission end is stripped of the coating layer and etched into a conical structure by hydrofluoric acid.
6. The method for preparing the deep stripped optical fiber guide type high-power optical fiber cladding stripper according to claim 5, which is characterized by comprising the following steps:
s1: firstly, cutting a transmission optical fiber into two parts, wherein one part is a left laser input end, and the other part is a right laser transmission end; removing the coating layer from the left laser input end, processing the end into a planar structure or a conical structure, and removing the coating layer from the right laser transmission end into a conical structure;
s2: preparing a plurality of guide optical fibers, removing coating layers of the guide optical fibers, and bundling the guide optical fibers and the right laser transmission end together;
s3: welding the left laser input end with a plurality of guide optical fibers and a cluster cone of the right laser transmission end;
s4: and packaging the optical fiber structure.
7. The method for manufacturing a deep stripped fiber-guided high power fiber cladding stripper according to claim 6, wherein in step S1, the left laser input end is cut into a planar structure or etched into a tapered structure by hydrofluoric acid.
8. The method for manufacturing a deep stripped fiber-guided high power fiber cladding stripper of claim 7, wherein in step S1, the right laser transmission end is etched into a tapered structure by hydrofluoric acid.
9. The method for manufacturing a deep-stripped fiber-guided high-power fiber cladding stripper as defined in claim 8, wherein in step S2, the guiding fibers are uniformly arranged on the outer circumference of the right-side laser transmission end, and 6 guiding fibers are uniformly arranged on the outer circumference of the right-side laser transmission end.
10. The method for preparing a deep-stripped fiber-guided high-power fiber cladding stripper of claim 6, wherein the stripping depth of the stripper is influenced by the cone structure parameters of the right laser transmission end and the thickness of the guiding fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011061047.0A CN112213821A (en) | 2020-09-30 | 2020-09-30 | Optical fiber guide type high-power optical fiber cladding optical stripper capable of deeply stripping |
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| CN202011061047.0A CN112213821A (en) | 2020-09-30 | 2020-09-30 | Optical fiber guide type high-power optical fiber cladding optical stripper capable of deeply stripping |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116247494A (en) * | 2022-12-30 | 2023-06-09 | 长沙大科光剑科技有限公司 | Single-mode fiber laser for filtering out high-order modes in cavity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104238014A (en) * | 2014-08-28 | 2014-12-24 | 清华大学 | Parallel optical fiber cladding light filtering device |
| CN105633778A (en) * | 2016-03-28 | 2016-06-01 | 中国人民解放军国防科学技术大学 | High-order-mode filtering optical fiber end surface pumping coupler and manufacture method thereof |
| CN206432553U (en) * | 2016-11-17 | 2017-08-22 | 大族激光科技产业集团股份有限公司 | A kind of optical fiber laser cladding light stripper |
| CN110488503A (en) * | 2019-09-24 | 2019-11-22 | 上海飞博激光科技有限公司 | A kind of beam energy is distributed adjustable loop laser export structure |
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2020
- 2020-09-30 CN CN202011061047.0A patent/CN112213821A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104238014A (en) * | 2014-08-28 | 2014-12-24 | 清华大学 | Parallel optical fiber cladding light filtering device |
| CN105633778A (en) * | 2016-03-28 | 2016-06-01 | 中国人民解放军国防科学技术大学 | High-order-mode filtering optical fiber end surface pumping coupler and manufacture method thereof |
| CN206432553U (en) * | 2016-11-17 | 2017-08-22 | 大族激光科技产业集团股份有限公司 | A kind of optical fiber laser cladding light stripper |
| CN110488503A (en) * | 2019-09-24 | 2019-11-22 | 上海飞博激光科技有限公司 | A kind of beam energy is distributed adjustable loop laser export structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116247494A (en) * | 2022-12-30 | 2023-06-09 | 长沙大科光剑科技有限公司 | Single-mode fiber laser for filtering out high-order modes in cavity |
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