CN101403810B - Pump coupling structure of double-cladding optical fiber laser - Google Patents
Pump coupling structure of double-cladding optical fiber laser Download PDFInfo
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- CN101403810B CN101403810B CN2008100720986A CN200810072098A CN101403810B CN 101403810 B CN101403810 B CN 101403810B CN 2008100720986 A CN2008100720986 A CN 2008100720986A CN 200810072098 A CN200810072098 A CN 200810072098A CN 101403810 B CN101403810 B CN 101403810B
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Abstract
The invention relates to the laser field, in particular to a pumping coupled structure of a double layer fiber laser in the optical fiber field. The pumping coupled structure of the double layer fiber laser is: an optical fiber capillary pipe casing is bonded and sheathed at the connecting part of doubly coated fiber which is used for coupling; one side of the optical fiber capillary pipe casing is polished to an inner packing layer of the doubly coated fiber (or is polished to an outer packing layer of the optical fiber so as to lead the optical fiber to have enough plane width), thus forming an optical plane and plating a deepening optical glue film on the plane; an optical fiber head of the inputting fiber is polished to a reasonable inclination angle and is plated with the deepening optical glue film. The optical fiber head is integrated with the connecting part of the doubly coated fiber with the optical fiber capillary pipe casing into a whole. On the basis of side gluing and aiming at the conventional pumping coupled manner that uses angle to grind and polish the side surface, a whole new technical proposal is invented by the invention and has the advantages of novel and reasonable structure, high reliability and being easy to be rapidly manufactured in a large scale, thus leading the structure to be widely applied to a high power pumping optical fiber laser.
Description
Technical field
The present invention relates to laser field, relate in particular to the pump coupling structure of the double-deck fiber laser in the field fiber.
Background technology
Doubly clad optical fiber provides good solution route for the effective pump power that improves fiber laser.Compare with common single mode optical fibres, doubly clad optical fiber has increased an inner cladding, and inner cladding is exactly the biography optical waveguide of pump light, and bigger numerical aperture and sectional area are arranged, and can make more pump light enter wherein transmission.In the process of transmission, powerful multimode pump light constantly passes through the fibre core of doping and is absorbed by wherein dopant ion, and the laser of generation transmits in fibre core, can obtain more powerful single-mode laser output like this.In the present pump technology, two kinds of methods of end pumping and profile pump are arranged:
1. in end-pumped method, the laser that the high power semiconductor lasers array is sent enters the inner cladding of double-clad laser from end face through beam shaping, lens combination after focusing on usually.Though this method can be coupled into inner cladding to pump light more effectively, but enter inner cladding from end face than the large-power semiconductor pumping laser, cause the fire damage of end face easily, thereby this increase that has just limited the pumping light power that enters inner cladding has limited the further raising of fiber laser output power.
2. in side pumping method, generally mainly contain four kinds of modes:
A. multimode optical fiber pyrometric cone profile pump coupling scheme
Multimode optical fiber fused biconical taper directional couple is that many bare fibres and the doubly clad optical fiber that removes surrounding layer are intertwined, heating makes it fusing in thermal-flame, simultaneously at optical fiber two ends stretching optical fiber, make the fiber fuse district become the tapering transition section, pump light can be imported inner cladding by multimode optical fiber via the doubly clad optical fiber side, thereby realize coupling pump Pu, directed side.
The coupling of B.V groove profile pump
The surrounding layer of doubly clad optical fiber and overlay are peelled off, carved a V-shaped groove on inner cladding, semiconductor laser to an end face of V-shaped groove, enters inner cladding through lens focus after total reflection.This method can be at a plurality of positions of doubly clad optical fiber etching V-shaped groove, with a plurality of diode-end-pumped doubly clad optical fibers, allow more pump light enter inner cladding, but this V-shaped groove because of its surface requirements very smooth and etching technics have relatively high expectations and be difficult to make, kept a plurality of breach on doubly clad optical fiber, the physical strength of optical fiber greatly weakens in addition.
C. embed reflection mirror pumping coupling
Embedding lens type pumping coupling scheme are the improvement on the groove etched mode of V.At first the surrounding layer of doubly clad optical fiber is removed sub-fraction, etch a sulculus then on inner cladding, the degree of depth of groove is enough put into and is used for the embedding micro-reflector of reflected pump light, but also has certain distance apart from fibre core, to guarantee not destroy fibre core.The reflecting surface of the micro-reflector that embeds can be plane or according to the curved surface of optimal design, in order to obtain high coupling efficiency, its reflecting surface has plated the rete of high anti-rate in advance, and the plane of incidence has plated the anti-reflection film to pump light.Adopted optical cement to be adhesively fixed in order to the exit facet and the optical fiber inner cladding that will embed little anti-mirror in this technology, optical cement also is used for reducing the reflection loss at interface as the refractive index match medium simultaneously.
D. angle grinding and polishing profile pump coupling
The present existing angle grinding and polishing profile pump coupling scheme of expression among Fig. 1, its method is on a bit of doubly clad optical fiber, removes its overlay and surrounding layer, with inner cladding grinding and polishing longitudinally, obtains the plane of a bit of pump light that is used to be coupled.(for the inner cladding shape is rectangle, D shape, the doubly clad optical fiber of sexangle etc., inner cladding has narrow plane, abundant as plane width, can the grinding and polishing doubly clad optical fiber, then an angled fiber end face of grinding and polishing is combined on the good inner cladding of mill with the close optical cement of refractive index.Pump light can be coupled into the inner cladding of doubly clad optical fiber by the pumping optical fiber side.) these texture edge pumping coupling scheme can obtain up to 90% coupling efficiency, but many pumping couplings that only is used to be lower than 1W, because light path has glue, optical cement is difficult to bear high power and causes volatilizing and decomposing.
In addition, with fiber angle grinding and polishing side coupling pump technology similar be that microprism carries out the side coupling, but the microprism width can not bring technical difficulty therefore for the processing of microprism greater than the diameter of inner cladding.It also only is the milliwatt magnitude that experiment obtains optical-fiber laser output.
Summary of the invention
These modes respectively have relative merits on the whole, and the present invention goes up a kind of brand new technical platform of invention at the gummed basis, side of the usefulness angle grinding and polishing profile pump coupling scheme of routine.
The present invention adopts following technical scheme:
Double-clad optical fiber laser pump coupling structure of the present invention is, the doubly clad optical fiber junction that is used to the be coupled optical fiber capillary pipe box that is with and bonds, optical fiber capillary pipe box one side is polished to the doubly clad optical fiber inner cladding or optical fiber jacket makes optical fiber that enough plane width be arranged, form optical flat and be coated with the in-depth optical cement film, the optical fiber head of input optical fibre is thrown to reasonable inclination angle and is coated with the in-depth optical cement film, and optical fiber head and the described doubly clad optical fiber junction that has optical fiber capillary pipe box are bonded as an integral body by the in-depth optical cement.
Further, described reasonable inclination angle is can satisfy total internal reflection requirement in doubly clad optical fiber after assurance is coupled into doubly clad optical fiber by jointed fiber.
Further, the reasonable inclination angle of the best of the present invention is about 80 °.
Further, described input optical fibre is single optical fiber, can also is the fiber array kapillary, can also is one or more input optical fibre heads of multiple tracks V-type groove bonding.
Further, described optical fiber capillary pipe box is whole capillary sleeve pipe, can also is the biplate sleeve pipe, can also is U type structure pipe box.
Further, according to the actual design needs, described doubly clad optical fiber junction can be distributed with one or more on described double-clad optical fiber laser.
The present invention adopts as above technical scheme, has novel and reasonable structure, reliability height, is easy to fast and large-scale production, thereby can will be widely used in the high power pump fiber laser.
Description of drawings
Fig. 1 is existing angle grinding and polishing profile pump coupling scheme;
Fig. 2 a is a structural representation of the present invention;
Fig. 2 b is external form figure of the present invention;
Fig. 3 a is a doubly clad optical fiber junction synoptic diagram;
Fig. 3 b is the first embodiment structural drawing of optical fiber capillary pipe box;
Fig. 3 c is the second embodiment structural drawing of optical fiber capillary pipe box;
Fig. 3 d is the 3rd an embodiment structural drawing of optical fiber capillary pipe box.
Embodiment
The present invention is further described for existing accompanying drawings and embodiment.
Double-clad optical fiber laser pump coupling structure of the present invention is: the doubly clad optical fiber junction that is used to the be coupled optical fiber capillary pipe box that is with and bonds, inner cladding or optical fiber jacket that optical fiber capillary pipe box one side is polished to doubly clad optical fiber make optical fiber that enough plane width be arranged, form optical flat and be coated with the in-depth optical cement film, the optical fiber head of input optical fibre is thrown to reasonable inclination angle and is coated with the in-depth optical cement film, and optical fiber head and the described doubly clad optical fiber junction that has optical fiber capillary pipe box are bonded as an integral body by the in-depth optical cement.Described reasonable inclination angle is can satisfy total internal reflection requirement in doubly clad optical fiber after assurance is coupled into doubly clad optical fiber by jointed fiber.The reasonable inclination angle of the best of the present invention is about 80 °.
Shown in Fig. 2 a, 201 is cladded-fiber, and 202 is surrounding layer, 203 optical fiber capillary pipe boxes, and 204 for porous capillary or arrange the V-type groove more and make optical fiber head, and 2051,2052......205n is an input optical fibre.
The specific embodiment of the present invention is: cladded-fiber is peelled off surrounding layer 202 for 201 1 sections, put optical fiber capillary pipe box 203, or with two semicircle optical fiber kapillaries with cladded-fiber 201 bonding that is clipped in the middle, optical fiber capillary pipe box 203 1 sides are polished with cladded-fiber 201, throw to optical fiber, can throw inner cladding, also can throw surrounding layer 202, making it has enough plane width with optical fiber, and be wider than the input optical fibre diameter, optical fiber kapillary 203 constitutes same optical flat with optical fiber 201, plates in-depth optical cement rete at this optical surface simultaneously.Adopt porous capillary or multiple tracks V-type groove (V-groove) one or more input optical fibres that bond, make it to throw into the angle of wedge, can enter optical fiber and make incident light can in cladded-fiber, produce full injection when about 80 °, making fiber end face and cladded-fiber bonding usually, also plate the in-depth optical cement film on many optical fiber heads of the present invention.
Because optical fiber head and cladded-fiber polished surface all have big optical surface, thereby are easy to optical cement and deepen optical cement, thereby permanent being bonded as one.Because of adopting the in-depth optical cement, the optical fiber and the cladded-fiber polished surface of input light can bear high power, thereby the previous described angle grinding and polishing of the cancellation side weakness of optics glue bond pumping coupling scheme, this patent adopts many optical fiber heads simultaneously, thereby has at utmost utilized a bonding point space to realize the high power coupling.
The present invention also can adopt two and two above junction bonding points.Suppose to throw to inner cladding, general inner cladding diameter is at least 500um, if the input optical fibre diameter is 250um, the inclination angle is 80 °, and single optical fiber can be imported by 4 optical fiber, if the then single node of double optical fiber can reach 8 input optical fibres.
Shown in Fig. 3 a, the 301st, cladded-fiber, the 302nd, optical fiber pipe box.The sticking double clad kapillary of cover of the present invention can be the sticking covering of removing of integrated fiber pipe box.Doubly clad optical fiber is shown in Fig. 3 b.Can also be that biplate cover plate shown in Fig. 3 c closes and is bonded on the doubly clad optical fiber, this structure be easy to need not remove all sheaths and only need removes one section sheath and bond in the middle of doubly clad optical fiber.
If the doubly clad optical fiber diameter is bigger, can adopt the two or more rows fiber array to make optical fiber head.Also can adopt the U type structure kapillary bonding doubly clad optical fiber of structure shown in Fig. 3 d.
The present invention is easy to fast and large-scale production owing to adopt the simple flat surface polishing technology and many optical fiber heads technology and optical cement technology and in-depth optical cement technology, the product reliability height, thus can will be widely used in the high power pump fiber laser.
Although specifically show and introduced the present invention in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present invention that do not break away from appended claims and limited; can make various variations to the present invention in the form and details, be protection scope of the present invention.
Claims (5)
1. double-clad optical fiber laser pump coupling structure, it is characterized in that: the doubly clad optical fiber junction that is used to the be coupled optical fiber capillary pipe box that is with and bonds, optical fiber capillary pipe box one side is polished to the doubly clad optical fiber inner cladding or optical fiber jacket makes optical fiber that enough plane width be arranged, form optical flat and be coated with the in-depth optical cement film, the optical fiber head of input optical fibre is thrown to reasonable inclination angle and is coated with the in-depth optical cement film, and optical fiber head and the described doubly clad optical fiber junction that has optical fiber capillary pipe box are bonded as an integral body by the in-depth optical cement; Described reasonable inclination angle is can satisfy total internal reflection requirement in doubly clad optical fiber after assurance is coupled into doubly clad optical fiber by jointed fiber.
2. double-clad optical fiber laser pump coupling structure as claimed in claim 1 is characterized in that: described reasonable inclination angle is 80 °.
3. double-clad optical fiber laser pump coupling structure as claimed in claim 1 is characterized in that: described input optical fibre is a single optical fiber, or the fiber array kapillary, or the input optical fibre head of multiple tracks V-type groove bonding.
4. double-clad optical fiber laser pump coupling structure as claimed in claim 1 is characterized in that: described optical fiber capillary pipe box is whole capillary sleeve pipe, or the biplate sleeve pipe, or U type structure pipe box.
5. double-clad optical fiber laser pump coupling structure as claimed in claim 1 is characterized in that: described doubly clad optical fiber junction can be distributed with one or more on described double-clad optical fiber laser.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100720986A CN101403810B (en) | 2008-11-05 | 2008-11-05 | Pump coupling structure of double-cladding optical fiber laser |
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| CN2008100720986A CN101403810B (en) | 2008-11-05 | 2008-11-05 | Pump coupling structure of double-cladding optical fiber laser |
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| CN101403810A CN101403810A (en) | 2009-04-08 |
| CN101403810B true CN101403810B (en) | 2010-06-09 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2194357A1 (en) * | 2008-12-03 | 2010-06-09 | Leica Geosystems AG | Optical sensor element for a measuring device and coupling element for this containing measuring device unit |
| CN101833132A (en) * | 2010-05-18 | 2010-09-15 | 中国科学院上海光学精密机械研究所 | Method for laser coupling between optical fibers |
| CN102890310A (en) * | 2011-12-30 | 2013-01-23 | 清华大学 | Polarization maintaining fiber side-pumped coupler and manufacturing method thereof |
| CN103050882B (en) * | 2012-12-07 | 2016-03-02 | 中国科学院西安光学精密机械研究所 | Adopt solid laser amplifier and the laser of optical fiber light-guiding laser diode-side-pumped |
| CN105281186B (en) * | 2015-11-19 | 2018-06-22 | 北京工业大学 | Side two directional pump fusion coupler and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1430078A (en) * | 2003-01-28 | 2003-07-16 | 南开大学 | Multimode optical fiber row and prism coupled double wrapping optical fiber device and its coupling method |
| CN2685900Y (en) * | 2004-03-17 | 2005-03-16 | 天津大学 | Non-Circular double-clad laser optical fiber with pumping optical wave guide external cladding |
| US7034992B2 (en) * | 2003-10-08 | 2006-04-25 | Northrop Grumman Corporation | Brightness enhancement of diode light sources |
| CN200997003Y (en) * | 2006-09-11 | 2007-12-26 | 福州高意通讯有限公司 | Assembled optical element |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1430078A (en) * | 2003-01-28 | 2003-07-16 | 南开大学 | Multimode optical fiber row and prism coupled double wrapping optical fiber device and its coupling method |
| US7034992B2 (en) * | 2003-10-08 | 2006-04-25 | Northrop Grumman Corporation | Brightness enhancement of diode light sources |
| CN2685900Y (en) * | 2004-03-17 | 2005-03-16 | 天津大学 | Non-Circular double-clad laser optical fiber with pumping optical wave guide external cladding |
| CN200997003Y (en) * | 2006-09-11 | 2007-12-26 | 福州高意通讯有限公司 | Assembled optical element |
Non-Patent Citations (3)
| Title |
|---|
| JP特开2004-193558A 2004.07.08 |
| 梅林.掺镱双包层脉冲光纤激光器研究.中国优秀硕士学位论文全文数据库信息科技辑2006年 05.2006,2006年(05),6-26. |
| 梅林.掺镱双包层脉冲光纤激光器研究.中国优秀硕士学位论文全文数据库信息科技辑2006年 05.2006,2006年(05),6-26. * |
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