CN106959489A - A kind of high-power fiber end cap based on conical fiber - Google Patents
A kind of high-power fiber end cap based on conical fiber Download PDFInfo
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- CN106959489A CN106959489A CN201710377180.9A CN201710377180A CN106959489A CN 106959489 A CN106959489 A CN 106959489A CN 201710377180 A CN201710377180 A CN 201710377180A CN 106959489 A CN106959489 A CN 106959489A
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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
- G02B6/241—Light guide terminations
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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
- G02B6/26—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
-
- 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
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
Abstract
A kind of high-power fiber end cap based on conical fiber, including conical fiber, quartz wedge and end cap shell；The big end of conical fiber penetrates into end cap enclosure from one end of end cap shell and is fixed on the cap shell of end, the other end of end cap shell offers the cavity stretched into for quartz wedge, one end of the quartz wedge inserting end cap enclosure is that one end outside truncated cone termination, quartz wedge external part cap shell is to be coated with anti-reflection film on the cylindrical end end face outside cylindrical and quartz wedge external part cap shell；In end cap enclosure; the truncated cone termination of quartz wedge and the big end phase welding of conical fiber; output end cap protection window is provided with the end cap shell of one end outside quartz wedge external part cap shell, the cylindrical end outside quartz wedge external part cap shell is enclosed in inside it by output end cap protection window.The present invention is simple in construction, can improve laser power ability to bear in optical fiber, keep good laser beam quality while nonlinear effect is effectively suppressed.
Description
Technical field
The invention belongs to optical-fiber laser field, it is related to a kind of high-power fiber end cap based on conical fiber.
Background technology
The later stage 1980s, maturation and the development of solid state laser with fiber making processes, optical fiber swashs
Light device starts to turn into study hotspot, and with doubly clad optical fiber and increasingly ripe, the high power optical fibre laser of cladding pumping technique
Device starts the progress of making a breakthrough property.Because optical fiber laser has small volume, lightweight, heat management convenience, good beam quality
The advantages of, in recent years, the high-capacity optical fiber laser of optical fiber output is in optic communication, material processing, medical consultations, information
The fields such as storage, laser printing, laser observing and controlling, laser spectroscopy and nonlinear frequency conversion are widely used.
With the continuous improvement of optical fiber laser output power, the power density in fiber core also constantly rises therewith.And
Because the output end face of optical fiber is during the processing such as cutting, grinding, polishing, inevitably left in the end face of optical fiber
Defect and damage so that internal field strengthens, and causes material damage, so in large-power optical fiber laser system, optical fiber output
End face processing is an important core technology.End caps are exactly to realize the passive device of high-power fiber of optical fiber end surface protective
Part, by the optical power density for expanding reduction output end to output optical fibre, so as to protect fiber end face without damage.
Traditional end caps reach expansion using the uniform optical fiber of common core size with expanding the welding of quartz wedge phase
The effect of beam and protection output end face.In order to keep the size and laser of energy-transmission optic fibre in beam quality, general end caps
Output optical fibre size is consistent, and 10-20 meters is generally required in commercial Application or even longer optical fiber, and this can cause to pass energy light
Nonlinear effect in fibre is produced, and has a strong impact on the use of laser.In nonlinear effect in a fiber, dissipated with excited Raman
Penetrate with stimulated Brillouin scattering based on.The threshold value of both nonlinear effects all with the close phase of fiber lengths in fibre system
Close, due to the increase of integral optical fiber length after addition end cap, the nonlinear effect the interaction distance in fiber core is elongated, makes
The threshold value of nonlinear effect is substantially reduced so that this traditional fiber end cap of limitation is in large-power optical fiber laser system, outstanding
It is the application in single mode high light beam quality fiber laser system.
On the other hand, in high power optical fibre laser system, due to factors such as the incomplete, fibre-optical bendings of Pumping light absorption,
The residual of cladding light will inevitably be had.Cladding light and flashlight, which are together exported, will reduce the entirety of output beam
Quality, so being also required to divest cladding light in output system.
The content of the invention
For the deficiency of above-mentioned prior art, the invention provides a kind of high-power fiber end cap based on conical fiber,
Its is simple in construction, can improve fibre core laser output ability to bear, effectively suppress nonlinear effect, effectively keeps laser light
Beam quality.
The technical scheme is that：
A kind of high-power fiber end cap based on conical fiber, including conical fiber, quartz wedge and end cap shell；Taper
The big end of optical fiber penetrates into end cap enclosure from one end of end cap shell and is fixed on the cap shell of end, holds the another of cap shell
End offers the cavity stretched into for quartz wedge, and one end of the quartz wedge inserting end cap enclosure is truncated cone termination, stone
One end outside English block external part cap shell is plating on the cylindrical end end face outside cylindrical and quartz wedge external part cap shell
There is anti-reflection film；In end cap enclosure, the truncated cone termination of quartz wedge and the big end phase welding of conical fiber are stretched in quartz wedge
Go out to hold to be provided with output end cap protection window on the end cap shell of one end outside cap shell, output end cap protection window stretches quartz wedge
Go out to hold the cylindrical end outside cap shell to be enclosed in inside it.
Conical fiber refers to that the core diameter of optical fiber becomes larger with the change of fiber lengths, can mix rare earth grain
The gain fibre of son and the energy transmission optical fibre of common undoped., can be by the two ends of conical fiber according to core diameter size
It is divided into big end and small end, larger one end of core diameter of conical fiber is big end, and the smaller one end of core diameter is small end.Small end exists
The outer output optical fibre phase welding with fiber laser system of cap shell is held, big end carries out welding in the cap shell of end with quartz wedge.Cone
Shape optical fiber can be single covering conical fiber, can be double clad conical fiber or many coverings i.e. covering be three layers i.e.
More than.Single covering conical fiber is made up of fibre core, inner cladding and coat, and the outer surface of fibre core is sequentially provided with from inside to outside
Inner cladding and coat, and the diameter of fibre core and inner cladding linearly becomes big with the growth of fiber lengths, and the thickness of coat is consolidated
It is fixed, do not changed with the length of optical fiber.The double clad conical fiber is by fibre core, inner cladding, surrounding layer and coat
Composition, the outer surface of fibre core is sequentially provided with inner cladding, surrounding layer and coat, and the diameter of fibre core and inner cladding is with the length of optical fiber
The growth of degree and linearly become big, the thickness of surrounding layer and coat is fixed, and is not changed with the length of optical fiber.
For double clad conical fiber, one end of the double clad conical fiber of inserting end cap enclosure is outside inserting end cap
The double clad conical fiber for needing to remove its coat, i.e. inserting end cap enclosure before inside shell is one section of removal coat
Optical fiber.It is coated and solidifies using uv-curable glue in the optical fiber surface for removing coat, forms a cladding light stripper.
End cap shell in the present invention is used to fix conical fiber, quartz wedge and output end cap protection window.In end cap
Enclosure can set the coolant auxiliary heat dissipation of flowing.It is cavity to hold cap enclosure, and the big end of conical fiber is from end cap
The cavity of one end inserting end cap enclosure of shell, the other end inserting end of the truncated cone termination of quartz wedge from end cap shell
The cavity of cap enclosure, in the cap enclosure cavity of end, the truncated cone termination of quartz wedge and the big end phase of conical fiber
Welding；It is provided with coolant input interface and coolant output interface on the side wall of the end cap shell, coolant is from coolant
Input interface upstream end cap enclosure cavity, from the outflow of coolant output interface, at end, the formation flowing of cap enclosure is cold
But liquid.
The general principle of the present invention is as follows：
In large-power optical fiber laser system, inelastic scattering is excited, i.e., stimulated Raman scattering (lower abbreviation SRS) is with being excited
Brillouin scattering (lower abbreviation SBS), is the key factor for limiting power ascension.Electronic Industry Press publish by
G.P.Agrawal is written《Nonlinear fiber optics principle and application》SRS and SBS threshold formula is summarized such as in one book
Under：
Wherein, gRAnd gBRespectively Raman gain coefficienct and brillouin gain coefficient.AeffFor the net sectional area of optical fiber,
LeffFor the effective length of optical fiber.In the case where fiber optic materials are certain, the gain coefficient of Raman and Brillouin scattering is constant,
So the threshold value of both nonlinear effects is then directly proportional to optical fiber net sectional area and is inversely proportional with optical fiber effective length.Generally
Optical fiber (commonly referred to as tail optical fiber) used in end caps is the energy-transmission optic fibre matched with fibre system fiber size, and
The addition of tail optical fiber causes the increase of system optical fiber effective length and causes the threshold value of nonlinear effect to reduce.And in conical fiber,
We can be such that the small end size of conical fiber is consistent with fiber laser system fiber size, then with the change of length
Change, the core size of optical fiber constantly becomes big.So, optical fiber net sectional area increases with the increase of fiber lengths, so as to carry
The high threshold value of nonlinear effect, can relatively efficiently suppress the generation of detrimental non-linear effect in fiber laser system.Please
Refering to Figure of description 4, Fig. 4 illustrate theoretical calculation a diameter of 20 microns of gain fibres (Fig. 4 (a)) of core diameter and core diameter from 20
The Raman signal intensity contrast that micron is gradually increased in 45 microns of long tapered gain optical fiber (Fig. 4 (b)).Can be with from Fig. 4
Find out, the raman scattering intensity of long conical fiber will be 20 microns far below common core diameter.Simultaneously as the positive core in conical fiber edge
Footpath gradually increases, then for backward light echo, core diameter is gradually reduced, and core diameter reduces the backward light echo brought
Loss can not only effectively prevent damage of the destructive feedback to fiber laser system, additionally it is possible to backward from suppression to a certain extent
The angle of light suppresses stimulated Brillouin scattering.On the other hand, according to theory analysis (referring to Shi Cheng, et al.,
Theoretical study of mode evolution in active long tapered multimode
fiber.Optics Express,2016.24(17):P.19473-19490), conical fiber has in itself can keep injection
The characteristics of laser beam quality.Figure of description 5 is referred to, Fig. 5 illustrates long conical fiber beam quality and develops and export
The simulation result of hot spot, the beam quality of output is consistent substantially with the beam quality inputted, that is to say, that long conical fiber
The serious degeneration of beam quality can't be caused during core diameter gradually increases, so as to keep laser system former
This excellent beam quality.
Quartz wedge in the present invention, which is located on the laser output face of end cap hull outside, is coated with anti-reflection film.Anti-reflection film can be with
The effectively loss of reduction laser power, while reducing backward light echo feedback, protection fiber laser system is injury-free.
In the present invention, quartz wedge and the circle that one end of conical fiber phase welding is that truncated cone, i.e. two ends are circular end face
Taper.One end outside quartz wedge external part cap shell body is cylinder.Wherein it is located at the truncated cone structure of end cap enclosure interior
It can make it that reverse light echo can not be coupled into tail optical fiber, reduce possible backward light echo feedback, effectively increase optical-fiber laser
Security and place of working stability.
Further, the present invention can set cooling cavity to be used to cooling medium circulation canal in the inside of end cap shell
Tackle the application scenarios of high power laser light.The gateway of cooling medium is connected with cooling cavity, can pass through external recycle unit
The circulation to cooling medium is realized, so as to improve the cooling effect of end cap.
Following technique effect can be reached using the present invention：
(1) use conical fiber as the tail optical fiber of end cap, protection is being provided to fiber laser system optical fiber output end face
Meanwhile, it can effectively suppress in large-power optical fiber laser system nonlinear effect (such as SRS and SBS) that may be present and harmful
Backward light echo；
(2) while protection is provided to fiber laser system optical fiber output end face, good beam quality can be kept,
It is particularly suitable for the power transmission of single mode high light beam quality laser；
(3) it can be allowed to tackle various application scenarios by the shell structure design to end caps, such as high-power light
Fibre laser etc..
Brief description of the drawings
High-power fiber end cap configuration schematic diagrames of the Fig. 1 based on single covering conical fiber
Fig. 2 double clad conical fiber structural representations
The mono- covering conical fiber structural representations of Fig. 3
Fig. 4 is not used and is exported Raman pump power comparison diagram using the laser during present invention under different pumping forms；Its
Middle Fig. 4 (a) is the laser output Raman pump power figure under different pumping forms when not using the present invention；Wherein Fig. 4 (b) is to adopt
Raman pump power figure is exported with the laser during present invention under different pumping forms
The conical fiber that Fig. 5 present invention is provided keeps the result of calculation of beam quality；Wherein Fig. 5 (a) is in conical fiber
Basic mode and high-order mode changed power curve；Fig. 5 (b) is conical fiber beam quality M2Change curve；Fig. 5 (c), (d) are respectively
Conical fiber is inputted and output facula aspect graph.
High-power fiber end cap configuration schematic diagrames of the Fig. 6 based on double clad conical fiber.
In figure：1st, single covering conical fiber；2nd, cap shell is held；3rd, quartz wedge；4th, anti-reflection film；5th, output end cap protection window；
6th, double clad conical fiber；7th, the optical fiber of coat is removed；8th, uv-curable glue；9th, coolant input interface；10th, coolant is defeated
Outgoing interface；11st, cavity；2-1, fibre core；2-2, inner cladding；2-3, surrounding layer；2-4, coat；
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Conical fiber proposed by the present invention refers to that the core diameter of optical fiber becomes larger with the change of fiber lengths, can
To be the energy transmission optical fibre for the gain fibre and common undoped for mixing rare earth ion.According to core diameter size, it will can bore
The two ends of shape optical fiber are divided into big end and small end.Refering to Fig. 2 and Fig. 3.The schematic diagram of double clad conical fiber is illustrated in Fig. 2, its
It is made up of fibre core 2-1, inner cladding 2-2, surrounding layer 2-3 and coat 2-4, fibre core 2-1 outer surface is sequentially provided with inner cladding
2-2, surrounding layer 2-3 and coat 2-4, fibre core 2-1 and inner cladding 2-2 diameter linearly become with the growth of the length of optical fiber
Greatly, surrounding layer 2-3 and coat 2-4 thickness are fixed, and are not changed with the length of optical fiber.Single bag is illustrated in Fig. 3
Layer conical fiber, it is made up of fibre core 2-1, inner cladding 2-2 and coat 2-4；Fibre core 2-1 outer surface is sequentially provided with interior bag
Layer 2-2 and coat 2-4, fibre core 2-1 and inner cladding 2-2 diameter linearly become big with the growth of the length of optical fiber, coat
Layer 2-4 thickness is fixed, and is not changed with the length of optical fiber.The difference of conical fiber and traditional fiber is it
The physical dimension of inner cladding and fibre core becomes larger with the increase of fiber lengths, and generally this core diameter change is in optical fiber fabrication mistake
Realized in journey by changing drawing speed.In conical fiber the larger and less port of core diameter be known respectively as big end with it is small
End.The typical sizes of its small end core diameter of double clad conical fiber are 10 μm~50 μm, the typical sizes of big end core diameter
For 50 μm~200 μm.The typical sizes of single its small end core diameter of covering conical fiber are 6 μm~10 μm, and core diameter is held greatly
Typical sizes be 20 μm~50 μm.
Embodiment 1：Referring to Fig. 1, a kind of high-power fiber end cap based on single covering conical fiber, including single covering cone
Shape optical fiber 1, quartz wedge 3 and end cap shell 2, the big end of single covering conical fiber 1 penetrate into end cap from one end of end cap shell 2
The inside of shell 2 is simultaneously fixed on end cap shell 2, and the other end of end cap shell 2 offers the cavity stretched into for quartz wedge 3, described
One end of the inserting end cap enclosure of quartz wedge 3 is that one end outside truncated cone termination, the external part cap shell 2 of quartz wedge 3 is
Anti-reflection film 4 is coated with cylindrical end end face outside cylindrical and the external part cap shell 2 of quartz wedge 3；Inside the cap shell 2 of end,
The truncated cone termination of quartz wedge 3 and the big end phase welding of conical fiber 1, one end outside the external part cap shell 2 of quartz wedge 3
End cap shell 2 on be provided with output end cap protection window 5, output end cap protect window 5 by outside quartz wedge external part cap shell
Cylindrical end is enclosed in inside it, prevents that output end face from polluting.
Fig. 4 is not use and using the laser output Raman pump power contrast during present invention under different pumping forms.Its
Middle Fig. 4 (a) is 20 μm of the core diameter of gain fibre in the Raman pump power of laser when not using the present invention, Fig. 4 (a), length
11m, during forward pumping, Raman pump power is more than 110W；The core size that Fig. 4 (b) is provided using the present invention is by 20 μm of gradual changes to 45 μ
Laser exports Raman pump power after m, length 11m long tapered gain optical fiber, in below 2.3W.Comparison diagram 4 (a), Fig. 4 (b) can
Know that the technical scheme provided using the present invention can greatly reduce the nonlinear effect of laser.
Fig. 5 keeps the result of calculation of beam quality for the conical fiber that the present invention is provided.Wherein Fig. 5 (a) is conical fiber
Middle basic mode and high-order mode changed power curve；Fig. 5 (b) conical fiber beam qualities M2Change curve；Fig. 5 (c), (d) are respectively
Conical fiber is inputted and output facula form.As a result show, during using conical fiber, preferable light beam matter when can keep inputting
Amount and hot spot form.
Embodiment 2：Referring to Fig. 6, a kind of high-power fiber end cap configuration schematic diagram based on double clad conical fiber.It is right
One end of double clad conical fiber 6 inside double clad conical fiber 6, inserting end cap shell 2 is inside inserting end cap shell 2
It is one section of removal coat to need the double clad conical fiber 6 removed inside its coat 2-4, i.e. inserting end cap shell 2 before
Optical fiber 7.It is coated and solidifies using uv-curable glue 8 on the surface of optical fiber 7 for removing coat, forms a covering photospallation
Device.
The coolant auxiliary heat dissipation of flowing is set inside the cap shell 2 of end.In the present embodiment, the inside of end cap shell 2 is sky
Chamber 11.The big end of double clad conical fiber 6 after processing is penetrated into the internal cavities of end cap shell 2 from one end of end cap shell 2
And be fixed on end cap shell 2.The other end of end cap shell 2 offers the cavity stretched into for quartz wedge 3, and the quartz wedge 3 is stretched
The one end for entering to hold cap enclosure is truncated cone termination, one end outside the external part cap shell 2 of quartz wedge 3 for cylindrical and
Anti-reflection film 4 is coated with cylindrical end end face outside the external part cap shell 2 of quartz wedge 3；In the internal cavities 11 of cap shell 2 of end, stone
The truncated cone termination of English block 3 and the big end phase welding of conical fiber 1, one end outside the external part cap shell 2 of quartz wedge 3
Output end cap protection window 5 is provided with end cap shell 2, output end cap protects window 5 by the circle outside quartz wedge external part cap shell
Styletable is enclosed in inside it, prevents that output end face from polluting.Coolant input interface 9 is provided with the side wall of the end cap shell 2
With coolant output interface 10, coolant is defeated from coolant from the internal cavities 11 of 9 upstream end cap shell of coolant input interface 2
Outgoing interface 10 is flowed out, and the coolant of flowing is formed in the internal cavities 11 of cap shell 2 of end.
In use, cooling water can be inputted from the coolant on the cap shell 2 of end by outer loop water cooling unit
Interface and the turnover of coolant output interface, realize circularly cooling to reach good refrigeration.The length in cavity will be cooled down
A wherein segment length for taper double clad energy-transmission optic fibre removes coat, and coats thereon uv-curable glue.Uv-curable glue
Refractive index can match with the refractive index of doubly clad optical fiber inner wrap material, so as to by not inhaling in optical fiber inner cladding
Receive complete pump light and higher order mode flashlight is divested.Cool down cavity in be full of cooling medium, cooling medium can by from
The light development of evil in febrile disease being stripped out in uv-curable glue is into heat absorption and takes away.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of high-power fiber end cap based on conical fiber, it is characterised in that including conical fiber, quartz wedge and end cap
Shell；The big end of conical fiber penetrates into end cap enclosure from one end of end cap shell and is fixed on the cap shell of end, holds cap
The other end of shell offers the cavity stretched into for quartz wedge, and one end of the quartz wedge inserting end cap enclosure is the frustum of a cone
One end outside shape termination, quartz wedge external part cap shell is the cylindrical end outside cylindrical and quartz wedge external part cap shell
Anti-reflection film is coated with end face；In end cap enclosure, the truncated cone termination of quartz wedge and the big end phase welding of conical fiber,
Output end cap protection window is provided with the end cap shell of one end outside quartz wedge external part cap shell, output end cap protection window will
Cylindrical end outside quartz wedge external part cap shell is enclosed in inside it.
2. the high-power fiber end cap according to claim 1 based on conical fiber, it is characterised in that its light of conical fiber
Fine core diameter becomes larger with the change of fiber lengths, the larger and less two ends of the core diameter of conical fiber point
It Wei not hold greatly and small end.
3. the high-power fiber end cap according to claim 2 based on conical fiber, it is characterised in that conical fiber is to mix
The gain fibre of rare earth ion or the energy transmission optical fibre of undoped.
4. the high-power fiber end cap according to claim 3 based on conical fiber, it is characterised in that conical fiber is single
Covering conical fiber, either double clad conical fiber or covering are more than three layers of many covering conical fibers.
5. the high-power fiber end cap according to claim 4 based on conical fiber, it is characterised in that single covering cone of light
Fine end core diameter is 6 μm~10 μm, and big end core diameter is 20 μm~50 μm；Double clad conical fiber small end core diameter
For 10 μm~50 μm, big end core diameter is 50 μm~200 μm.
6. the high-power fiber end cap according to claim 4 based on conical fiber, it is characterised in that single covering cone
Shape optical fiber is made up of fibre core, inner cladding and coat, and the outer surface of fibre core is sequentially provided with inner cladding and coat, fibre core and Nei Bao
The diameter of layer linearly becomes big with the growth of the length of optical fiber, and the thickness of coat is fixed.
7. the high-power fiber end cap according to claim 4 based on conical fiber, it is characterised in that the double clad cone
Shape optical fiber is made up of fibre core, inner cladding, surrounding layer and coat, and the outer surface of fibre core is sequentially provided with inner cladding, surrounding layer and painting
Coating, and the diameter of fibre core and inner cladding linearly becomes big with the growth of the length of optical fiber, and the thickness of surrounding layer and coat is consolidated
It is fixed.
8. the high-power fiber end cap according to claim 6 based on conical fiber, it is characterised in that bored for double clad
Shape optical fiber, one end of the double clad conical fiber of inserting end cap enclosure needs to remove its painting before inserting end cap enclosure
The double clad conical fiber of coating, i.e. inserting end cap enclosure is the optical fiber of one section of removal coat；Removing coat
Optical fiber surface is coated and solidified using uv-curable glue, forms a cladding light stripper；By double-contracting after treatment
The big end of layer conical fiber penetrates into end cap enclosure cavity from one end of end cap shell and is fixed on the cap shell of end.
9. the high-power fiber end cap based on conical fiber according to any claim in claim 1 to 8, its feature
It is that cap enclosure sets the coolant auxiliary heat dissipation of flowing at end.
10. the high-power fiber end cap according to claim 9 based on conical fiber, it is characterised in that in the cap shell of end
Portion is cavity, and the big end of conical fiber is from the cavity of one end inserting end cap enclosure of end cap shell, the frustum of a cone of quartz wedge
Shape termination from end cap shell other end inserting end cap enclosure cavity, end cap enclosure cavity in, quartz wedge
Truncated cone termination and the big end phase welding of conical fiber；Be provided with the side wall of the end cap shell coolant input interface and
Coolant output interface, coolant is from coolant input interface upstream end cap enclosure cavity, from coolant output interface stream
Go out, in the coolant of end cap enclosure formation flowing.
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| CN201710377180.9A CN106959489B (en) | 2017-05-25 | 2017-05-25 | High-power optical fiber end cap based on tapered optical fiber |
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| CN201710377180.9A CN106959489B (en) | 2017-05-25 | 2017-05-25 | High-power optical fiber end cap based on tapered optical fiber |
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| CN114966951A (en) * | 2022-05-26 | 2022-08-30 | 哈尔滨工程大学 | Scattering enhancement sensing optical fiber for realizing equal scattered light and preparation method thereof |
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