CN202068084U - Fiber transverse plane coupler - Google Patents
Fiber transverse plane coupler Download PDFInfo
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- CN202068084U CN202068084U CN 201020598758 CN201020598758U CN202068084U CN 202068084 U CN202068084 U CN 202068084U CN 201020598758 CN201020598758 CN 201020598758 CN 201020598758 U CN201020598758 U CN 201020598758U CN 202068084 U CN202068084 U CN 202068084U
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- optical fiber
- fiber
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- doubly clad
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- 239000000835 fiber Substances 0.000 title claims abstract description 37
- 239000013307 optical fiber Substances 0.000 claims abstract description 100
- 238000005253 cladding Methods 0.000 claims abstract description 21
- 239000004065 semiconductor Substances 0.000 claims abstract description 14
- 238000005086 pumping Methods 0.000 claims description 84
- 238000010168 coupling process Methods 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 14
- 230000003287 optical effect Effects 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009022 nonlinear effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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Abstract
The utility model relates to a fiber transverse plane coupler, belonging to the field of laser technology application. The fiber transverse plane coupler comprises a double cladding optical fiber, a pumped fiber and a semiconductor laser pumped source, wherein an output end of the semiconductor laser pumped source is coupled with one end of the pumped fiber, the other end of the pumped fiber contacts with one end of the double cladding optical fiber in a fully optical manner and is welded together with the double cladding optical fiber, and the transverse plane of the pumped fiber and a vertical axial plane of the pumped fiber form a certain angle. The fiber transverse plane coupler can effectively pump the double cladding optical fiber, and also prevent damage to the pumped source caused by signal light leakage, thereby protecting the pumped source and improving service life of the pumped source.
Description
Technical field
The utility model relates to a kind of fiber end face coupler, belongs to laser technology field.
Background technology
Fiber laser has good beam quality, efficient height, compact conformation, volume is little, thermal diffusivity good, the reliability advantages of higher.In recent years, development along with pump technology and doubly clad optical fiber manufacture craft, the power output of fiber laser is significantly improved, and makes it all obtain using widely at national defence, industry, scientific research, civil area, and particularly high-power full-optical-fiber laser has a wide range of applications.
At present, the key that high-capacity optical fiber laser is realized is how to make gain fibre obtain high pump power, and therefore, the improvement of pumping coupling process is a key technology.Pumping coupling technique commonly used is divided into end pumping and profile pump, wherein, the optical fiber side-pumping method is a lot, the representative pyrometric cone profile pump technology that mainly contains, V-type groove coupling pump technology, embedded speculum coupling technique, this technology can obtain high pumping efficiency, but the mechanical performance to optical fiber affects, and difficulty of processing is big, system is comparatively complicated, pyrometric cone profile pump technology is to grasp for IPG company, domestic only have minority mechanism research, do not make substantial progress yet.The kW level fiber laser of some reports adopts the end pumping technology mostly, and this requires the inner cladding size and the numerical aperture of pump light shape and numerical aperture and doubly clad optical fiber to be complementary.The characteristics of this technology maximum are that technology is simple, are easy to realize, can also the both-end pumping.Therefore utilize the end pump technology of lens combination in experimental study, to be widely adopted.The laser greatest drawback in the commercialization process that is made of discrete device is exactly a poor stability, at this shortcoming, fused fiber splice can be coupled, this laser carries out pumping with the direct welding of pump light of tail optical fiber output at the end face of optical fiber, adopts fiber grating to carry out the feedback of flashlight in the resonant cavity.The integrated level and the stability of system have been improved so greatly.But under high-power running, the nonlinear effect in the optical fiber is remarkable, particularly under the high-peak power situation, the light of vibration in the chamber just is easy to reveal from doubly clad optical fiber, and this easily causes facing and burns system's cisco unity malfunction on the pumping source of pumping optical fiber end face.
Summary of the invention
The purpose of this utility model is to overcome when the high power laser end pumping; the shortcoming and defect that light burns is revealed in the semiconductor laser pumping source easily; a kind of high power dual-cladding fiber laser end-pumped method is proposed; in the optical fiber of effective pumping double clad; can prevent the injury of flashlight leakage again to pumping source; play the effect of protection pumping source, improve the useful life of pumping source.
The utility model adopts following technical scheme:
A kind of fiber end face coupler comprises doubly clad optical fiber, pumping optical fiber, semiconductor laser pumping source; The output in semiconductor laser pumping source is coupled into an end of pumping optical fiber, and simultaneously, the other end of pumping optical fiber contacts with the complete optics of an end of doubly clad optical fiber, is welded together; This end face of pumping optical fiber axial plane angulation vertical with it is a:a+ θ≤β, and wherein θ can be coupled to maximum incident angle degree in the pumping optical fiber for the semiconductor laser pumping source, β be can the coupled into double-clad fiber inner cladding maximum angle.
Described doubly clad optical fiber is non-circle symmetry, the inner cladding structure can be rectangular configuration, square structure, D type structure, regular hexagon structure, octagon structure, eccentric type etc., this non-round symmetrical structure can be broken the balance of spiral light, promotes pump light to absorb, and improves coupling efficiency.
Can also be the welding that is coupled of many pumping optical fibers and doubly clad optical fiber after end face is handled, wherein the pumping optical fiber mode that can converge and the inner cladding of doubly clad optical fiber be coupled; Wherein pumping optical fiber also can be the inner cladding coupling with the mode of dispersing and doubly clad optical fiber; Wherein pumping optical fiber can also be the coupled modes that tilt along doubly clad optical fiber end face circumference.
The utility model can be obtained following beneficial effect:
The coupling process that the utility model is designed can solve the defective that the method described in the background technology exists, and promptly the optical fiber of effective pumping double clad can play the effect of protection pumping source again.A light part that leaks into pumping optical fiber can not revealed from the pumping optical fiber sidewall because do not satisfy total reflection; promptly enable to be transferred to semiconductor laser pumping source facing to the pumping optical fiber end face; also can increase because of revealing the light angle of divergence; the power density that pumping source receives reduces, and pumping source is played the effect of protection.
Description of drawings
Fig. 1 is an end pumping coupler schematic diagram of the present utility model
Fig. 2 handles schematic diagram for the pumping optical fiber end face
Fig. 3 is the general fiber end face coupler structure schematic diagram that adopts
Fig. 4 is a kind of structural representation of many pumping optical fiber couplings of the present utility model
Fig. 5 is a kind of structural representation of many pumping optical fiber couplings of the present utility model
Fig. 6 is a kind of structural representation of many pumping optical fiber couplings of the present utility model
Among the figure: 1, doubly clad optical fiber, 101, the fibre core of doubly clad optical fiber, 102, the inner cladding of doubly clad optical fiber, 103, the surrounding layer of doubly clad optical fiber, 2, pumping optical fiber, 201, the fibre core of pumping optical fiber, 202, the covering of pumping optical fiber, 3, semiconductor laser pumping source, the processing end face of A, pumping optical fiber.
Embodiment:
Existing accompanying drawings further specifies embodiment of the present utility model:
Embodiment:
The present embodiment structure, as shown in Figure 1, a kind of end pumped laser fiber coupler with angle a, its feature realizes by following method: it comprises a doubly clad optical fiber 1, pumping optical fiber 2 and semiconductor laser pumping source 3.
The fiber end face A of the pumping optical fiber 2 in the present embodiment and the angled a of vertical axial plane, as shown in Figure 2, the end face A that handles well contacts and is welded together with an end optics of doubly clad optical fiber 1.Wherein, the angle a of pumping optical fiber end face A need satisfy: θ+a≤β, (θ is that the maximum incident angle degree in the pumping optical fiber 2 can be coupled in semiconductor laser pumping source 3, β is the maximum angle of energy coupled into double-clad fiber inner cladding 102, for the pumping optical fiber 1 and the doubly clad optical fiber 2 of selected parameter, the value of θ, β is by the decision of ducting layer medium refraction index).Angle a crosses the energy that conference causes coupled into optical fibres and loses because of the total reflection that can not satisfy in the doubly clad optical fiber 1, the too small then pumping coupler structure with general employing shown in Figure 3 of angle a is the same, can cause the inefficacy of pumping source with the leakage optical transmission to pumping source 3.Therefore, a angle should be got maximum in allowed band, both can fully transmit pump light, can well protect pumping source again.
After pumping optical fiber 2 is coupled with doubly clad optical fiber 1, pump light is constrained on transmission in the asymmetrical inner cladding, final light is all absorbed by the dopant ion of fibre core, produce laser emission and in the chamber, produce vibration, under high-power running, the nonlinear effect in the optical fiber is remarkable, particularly under the high-peak power situation, laser in the vibration chamber is easy to reveal from doubly clad optical fiber, is coupled into pumping optical fiber 2.Therefore; after pumping optical fiber 2 and doubly clad optical fiber 1 adopt the angle coupling; the light that doubly clad optical fiber fibre core 101 is revealed just has very big incidence angle at pumping optical fiber 2 end faces; this just makes part light just reveal from sidewall in the process of transmission; even be transferred to pumping source 3 end faces; the outgoing cross section of light also can be bigger, and this has all reduced the power density that semiconductor laser pumping source 3 receives light echo, plays the effect of protection pumping source 3.
The coupler of this structure also can be realized many pumped fibers of end face, comprise following structure as shown in Figure 4: many pumping optical fiber 2 end faces are handled the welding that is coupled of back and doubly clad optical fiber 1, wherein the axis direction of these pumping optical fibers 2 coupled modes of outwards dispersing from doubly clad optical fiber 1 end face; Further comprise following structure as shown in Figure 5: many pumping optical fiber 2 end faces are handled the welding that is coupled of back and doubly clad optical fiber 1, wherein the coupled modes inwardly gathered from doubly clad optical fiber 1 end face of the axis direction of pumping optical fiber 2; Further comprise following architecture as shown in Figure 6: many pumping optical fiber 2 end faces are handled the welding that is coupled of back and doubly clad optical fiber 1, and wherein the axis direction of pumping optical fiber 2 is the coupled modes along the circumferential lopsidedness of doubly clad optical fiber 1 end face.
Claims (3)
1. a fiber end face coupler is characterized in that: comprise doubly clad optical fiber (1), pumping optical fiber (2), semiconductor laser pumping source (3); The output of semiconductor laser pumping source (3) is coupled into an end of pumping optical fiber (2), and simultaneously, the other end of pumping optical fiber (2) contacts with the complete optics of an end of doubly clad optical fiber (1), is welded together; This end face of pumping optical fiber (2) axial plane angulation vertical with it is a:a+ θ≤β, wherein θ is that the maximum incident angle degree in the pumping optical fiber can be coupled in semiconductor laser pumping source (3), and β is the maximum angle of energy coupled into double-clad fiber (1) inner cladding.
2. a kind of fiber end face coupler according to claim 1 is characterized in that: the inner cladding of doubly clad optical fiber (102) is that non-circle is symmetrical.
3. a kind of fiber end face coupler according to claim 1, it is characterized in that: can also be the welding that is coupled of many pumping optical fibers (2) and doubly clad optical fiber (1) after end face is handled, wherein pumping optical fiber (2) be coupled with the mode that the converges inner cladding with doubly clad optical fiber (1); Wherein pumping optical fiber (2) also can be the inner cladding coupling with the mode of dispersing and doubly clad optical fiber (1); Wherein pumping optical fiber (2) can also be the coupled modes that tilt along doubly clad optical fiber (1) end face circumference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020598758 CN202068084U (en) | 2010-11-05 | 2010-11-05 | Fiber transverse plane coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020598758 CN202068084U (en) | 2010-11-05 | 2010-11-05 | Fiber transverse plane coupler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202068084U true CN202068084U (en) | 2011-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020598758 Expired - Lifetime CN202068084U (en) | 2010-11-05 | 2010-11-05 | Fiber transverse plane coupler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202068084U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760636A (en) * | 2013-12-31 | 2014-04-30 | 华中科技大学 | Multi-beam splitter |
| CN105375246A (en) * | 2015-09-28 | 2016-03-02 | 中国工程物理研究院应用电子学研究所 | A planar waveguide laser amplifier with end face slant pumping |
| CN107561635A (en) * | 2017-10-13 | 2018-01-09 | 中国工程物理研究院激光聚变研究中心 | Gradual change absorption coefficient gain fibre and optical system |
-
2010
- 2010-11-05 CN CN 201020598758 patent/CN202068084U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760636A (en) * | 2013-12-31 | 2014-04-30 | 华中科技大学 | Multi-beam splitter |
| CN105375246A (en) * | 2015-09-28 | 2016-03-02 | 中国工程物理研究院应用电子学研究所 | A planar waveguide laser amplifier with end face slant pumping |
| CN107561635A (en) * | 2017-10-13 | 2018-01-09 | 中国工程物理研究院激光聚变研究中心 | Gradual change absorption coefficient gain fibre and optical system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111207 |