CN201774137U - Laser mode purification unit - Google Patents
Laser mode purification unit Download PDFInfo
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- CN201774137U CN201774137U CN2010202936441U CN201020293644U CN201774137U CN 201774137 U CN201774137 U CN 201774137U CN 2010202936441 U CN2010202936441 U CN 2010202936441U CN 201020293644 U CN201020293644 U CN 201020293644U CN 201774137 U CN201774137 U CN 201774137U
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- optical fiber
- purifier
- releasing
- clad optical
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Abstract
The utility model discloses a laser mode purification unit comprising a metal seat and a doubly clad optical fiber fixed in the metal seat, wherein the doubly clad optical fiber comprises an undoped fibre core, an inner clad layer and an outer clad layer with refractive indexes sequentially reduced from inside to outside; the doubly clad optical fiber is provided with at least two bleeding sections positioned in the metal seat and adjoined with each other; for each bleeding section, the outer clad layer is stripped and an adhesive layer is coated on the inner clad layer; and the refractive index of the adhesive layer of each bleeding section is sequentially increased or reduced but larger than that of the inner clad layer. The laser mode purification unit can realize laser mode purification with extremely high efficiency.
Description
Technical field
The utility model relates to optical-fiber laser pattern purification techniques, particularly a kind of zlasing mode purifier.
Background technology
At present along with the development of science and technology and modern industry, communication, needed optical-fiber laser power output has become increasing, and in order to address that need, people have proposed the notion of doubly clad optical fiber efficiently.The structure of one typical doubly clad optical fiber is followed successively by fibre core, inner cladding, surrounding layer and outmost protective layer from the inside to the outside, and the refractive index of fibre core, inner cladding and surrounding layer reduces successively.Utilize doubly clad optical fiber can form high-power fiber amplifier and fiber laser or the like.
Shown in Figure 1 just is the structural representation of a high-power fiber amplifier.This fiber amplifier mainly comprises seed source 1 ', pre-amplification module 2 ' and these three parts of power amplifier module, wherein this power amplifier module then comprises a plurality of optically pumped lasers 31 ', bundling device 32 ' and active doubly clad optical fiber 33 ', be doped with rare earth ion in the fibre core of this active doubly clad optical fiber 33 ', for example mix ytterbium, erbium and ytterbium codoping, mix thulium, neodymium-doped or the like.What this prevented big module 2 ' employing is the optical fiber of single mode list covering, realizes amplifying in advance with the core pump mode, and the power that arrives when preventing big grade only is hundred milliwatt magnitudes.In this doubly clad optical fiber 33 ', flashlight transmits in fibre core, pumping light is spiral advancing in inner cladding then, when pumping light passes through fibre core, just can be absorbed, be incident upon excitation state thereby rare earth ion swashed from ground state, when the number of particles of excitation state surpasses the number of particles (population inversion) of ground state by the rare earth ion in the fibre core, snowslide phenomenon will take place in the particle of excitation state, fall back to ground state, swash the laser that penetrates corresponding wave band simultaneously, to realize the further amplification of flashlight.Swashed and penetrated amplifying signal light except the laser of ground state pattern, also included the laser of a part of low step mode; If during the further overstriking of fibre core, then laser that also can some higher order mode is swashed and is shot out; In addition, for abundant pumping, also must keep residue that enough pumping light is arranged.
Output at so active doubly clad optical fiber, because surrounding layer divests, and the refractive index of air is less than inner cladding, and this just can cause the accumulation of energy in the inner cladding, if can not effectively handle, then will cause phenomenons such as overheated burning taking place at this output to this.Therefore, in systems such as high-power fiber amplifier and high-capacity optical fiber laser, the output of the active doubly clad optical fiber 33 ' of this in Fig. 1 for example, on the one hand for the safety of the isolator 5 ' that guarantees the back, on the other hand in order to guarantee to export the pure of zlasing mode, promptly make the output zlasing mode to be necessary to be provided with a zlasing mode purifier 4 ', so that non-basic mode laser and pumping light are carried out filtering as much as possible near diffraction limit.
For the function of this zlasing mode purifier 4 ', the general at present implementation that adopts has:
1) high-power filter
But filter is merely able to the corresponding pumping light of filtering, but is difficult to filter out the laser of laser, the especially low step mode of non-ground state pattern; Costing an arm and a leg of high power filter also can cause the insertion loss simultaneously.
2) the two-phase look mirror of space structure, and WDM (wavelength division multiplexing) is anticaustic
The defective of these two kinds of methods is similar to the situation of filter, and especially the two-phase look mirror of space structure can't be realized full fiberize, and high-power WDM then costs an arm and a leg.
3) at the glue-line of the single high index of refraction of the output of active doubly clad optical fiber coating, i.e. pumping bleeder
This kind scheme is all more effective than other above-mentioned device, and low price.Yet the glue-line of single high index of refraction still is difficult to the laser of all residue pumping light of filtering and non-basic mode laser, especially low step mode.
The utility model content
The technical problems to be solved in the utility model is in order to overcome the defective that prior art can't realize effectively that zlasing mode purifies, a kind of zlasing mode purifier that can realize very efficiently that zlasing mode purifies to be provided.
The utility model solves above-mentioned technical problem by following technical proposals: a kind of zlasing mode purifier, its characteristics are, it comprises that a metal pedestal and wears the doubly clad optical fiber that is fixed in this metal pedestal, this doubly clad optical fiber comprises the non-impurity-doped fibre core that refractive index reduces successively from the inside to the outside, inner cladding and surrounding layer, this doubly clad optical fiber has at least two sections of releasing that are arranged in this metal pedestal and adjoin each other, each Duan Jun that releases has divested surrounding layer, and on inner cladding, scribbling glue-line, the refractive index of the glue-line of each section of releasing increases successively or reduces successively, but all greater than the refractive index of inner cladding.
Preferably, the quantity of the described section of releasing is three.
Preferably, the length of each section of releasing is identical.
Preferably, the glue-line of each section of releasing is ultra-violet curing glue material.
Preferably, this metal pedestal comprises a cover plate and a base plate that interfixes, and this base plate is provided with the groove that is used to shelve this doubly clad optical fiber.
Preferably, the shape of cross section of this groove is semicircle.
Preferably, this base plate is provided with a plurality of fixedly ears.
Preferably, this metal pedestal is an aluminum.
Positive progressive effect of the present utility model is:
1, will be used for the section of releasing that pumping light and non-basic mode laser carry out filtering is formed on one section passive fiber that the Active Optical Fiber with practical application is complementary, guarantee the integrality of gain medias such as amplifier and laser thus.
Therefore 2, the inner cladding of this passive fiber and fibre core all are not damaged, and after the Active Optical Fiber welding of this passive fiber and practical application, can guarantee that the size, intensity etc. of the transmission of flashlight and signal thereof are all unaffected.
3, a plurality of adjacent sections of releasing on this passive fiber, have been designed, each section of releasing is coated with the high index of refraction glue-line that refractive index increases successively or reduces successively respectively, remaining pumping light progressively can be released on the one hand thus, rather than the stripping starting point (divest the starting point of surrounding layer, this some place is that pumping light is revealed the strongest position) locate once with the filtering of most pumping light, can avoid preferably thus causing catching fire and wait accident, thereby guarantee the fail safe of this zlasing mode purifier; On the other hand can be with the laser of higher order mode and the almost thoroughly filtering of laser that is centered around the low step mode in the fibre core, thus make that the zlasing mode of final output is pure, approach diffraction limit.
4, this passive fiber wears and is fixed in the metal pedestal, guaranteed can with the energy efficient of the non-basic mode laser of releasing out and pumping light be converted into heat energy, and be transmitted to the outside efficiently by this metal pedestal.
5, this metal pedestal can be fixed on relevant device or the device, and solid and reliable, shock resistance is strong.
6, lower cost for material, making and easy for installation, and can produce in batches.
Description of drawings
Fig. 1 is the structural representation of an existing fiber amplifier.
Fig. 2 is the schematic diagram of the passive doubly clad optical fiber in the utility model.
Fig. 3 is the perspective view of the passive doubly clad optical fiber in the utility model.
Fig. 4 is the structural representation of the base plate of the metal pedestal in the utility model.
Schematic diagram when Fig. 5 is shelved with passive fiber for the base plate of the metal pedestal in the utility model.
Fig. 6 is the schematic diagram of this zlasing mode purifier of the present utility model.
Embodiment
Provide the utility model preferred embodiment below in conjunction with accompanying drawing, to describe the technical solution of the utility model in detail.
As shown in Figure 6, this zlasing mode purifier of the present utility model comprises that a metal pedestal 1 and wears the passive doubly clad optical fiber 2 that is fixed in this metal pedestal 1.As shown in Figure 3; this passive doubly clad optical fiber 2 is divided into three parts; its head and the tail two parts all remain common doubly clad optical fiber structure, promptly are followed successively by undoped fibre core 21, inner cladding 22, surrounding layer 23 and outmost protective layer from the inside to the outside, and the refractive index of establishing fibre core is n
1, inner cladding refractive index be n
2, surrounding layer refractive index be n
3, then satisfy n
1＞n
2＞n
3, promptly inner cladding 22 all forms fiber waveguide with fibre core 21 and surrounding layer 23 with inner cladding 22, thereby guarantees that flashlight S1 will transmit in fibre core after the Active Optical Fiber welding of this passive fiber and practical application, and pumping light S2 then will transmit in inner cladding.
Especially, the design of the mid portion of this doubly clad optical fiber 2 has at least two sections of releasing, those sections of releasing to adjoin each other, also all be arranged in this metal pedestal 1.As shown in Figure 2 and with reference to figure 3 and Fig. 5; preferably on this doubly clad optical fiber 2 design have three section of releasing A, B and C, each Duan Jun that releases be on the architecture basics of above-mentioned ordinary passive doubly clad optical fiber by the inner cladding 22 that divests surrounding layer 23 (certainly also having divested the protective layer of surrounding layer outside) and then coming out on glue coated layer realize.If the refractive index of the glue-line A1 of the section of releasing A is n
I, the section of releasing B the refractive index of glue-line B1 be n
II, the section of releasing C the refractive index of glue-line C1 be n
III, then they should satisfy: n
I＜n
II＜n
IIIOr n
I＞n
II＞n
III, and n
I, n
II, n
IIINumerical value all greater than the refractive index n of inner cladding 22
2When this zlasing mode purifier connecting system of the present utility model is used, should select will this passive doubly clad optical fiber 2 the nearer end of the section of releasing apart from glue-line refractive index minimum and the Active Optical Fiber of practical application carry out welding, when thereby feasible transmission direction along flashlight was observed, the glue-line refractive index of a plurality of sections of releasing of adjacency increased successively.Preferably, the coated different glue-line of refractive index of each section of releasing all can adopt ultra-violet curing glue, and the ultra-violet curing glue of required various refractive indexes is all commercially available to be got, and the coating of this kind glue and curing operation are all very convenient.As shown in Figure 3, at those sections of releasing places of the mid portion of this passive doubly clad optical fiber 2, remaining pumping light S2 will progressively be released, and non-basic mode laser also will be by almost thoroughly filtering simultaneously.
This metal pedestal 1 can adopt various structures, and shown in Fig. 4-6, for example it can comprise a cover plate 11 and a base plate 12, can realize covering fixing by for example screw and screw hole 121 between them.This base plate 12 is provided with the groove 13 that is used to shelve this passive doubly clad optical fiber 2, and the cross section of this groove 13 preferably is semicircle, and this doubly clad optical fiber 2 then is fixed in this groove 13 by some glue.The material of this metal pedestal 1 preferably can aluminium, to realize high-efficiency heat conduction on the basis of considering cost.In addition, still shown in Fig. 4-6, can also design a plurality of fixedly ears 14 on this base plate 12, so that this metal pedestal 1 and other relevant device or device are fixed.
Embodiment
This zlasing mode purifier can be located at any position in the systems such as high-power fiber amplifier or high-capacity optical fiber laser, for example in high-power fiber amplifier system shown in Figure 1, just can adopt this zlasing mode purifier of the present utility model to replace the zlasing mode purifier 4 ' of original poor effect.
The manufacture method and the using method of this zlasing mode purifier of the present utility model are as follows:
1) choosing a segment length and be about 50cm's and the passive doubly clad optical fiber that is complementary with this active doubly clad optical fiber 33 ' among Fig. 1, is that one section the surrounding layer of L divests with the mid portion length of this passive fiber.
2) divesting on this section of surrounding layer, bearing of trend along this passive fiber applies the ultra-violet curing glue that three kinds of refractive indexes increase successively successively, and the refractive index of these three kinds of ultra-violet curing glue is all greater than the inner cladding refractive index of this passive fiber, the coating length of every section ultra-violet curing glue is for example about L/3, thereby forms three sections of releasing.
3) as shown in Figure 5, this passive fiber point glue is fixed in the groove 13 on this base plate 12, and guarantees that the Duan Jun that releases that is coated with ultra-violet curing glue is arranged in this groove 13; Then as shown in Figure 6, the cover plate 11 that closes, and this cover plate 11 and this base plate 12 interfixed.
4) two ends of making this zlasing mode purifier finish are the naked fibre that stretches out this metal pedestal 1, utilize optical fiber splicer with the naked fibre of an end and the active doubly clad optical fiber 33 ' welding of front, and with the naked fibre of the other end and the device weldings such as for example isolator of back, and the augment direction of the refractive index of three kinds of ultra-violet curing glue of assurance coating is identical with the transmission direction of flashlight.Welding point place then can adopt the same lower ultra-violet curing glue of the commercially available refractive index that gets to apply protection in addition.
Be that example is illustrated the utility model above with the situation that three sections of releasing are set, but those skilled in the art are to be understood that, this is only for having considered to make complexity and a kind of preferred to after the filtering efficient of non-basic mode laser and pumping light, according to known coupling principle, as long as the glue-line refractive index of each section of releasing is all greater than inner cladding refractive index, and the glue-line refractive index of each section of releasing increases successively then all can realize basic purpose of the present utility model, therefore selecting two or three above sections of releasing of design also is feasible obviously, does not do at this and gives unnecessary details.
In sum, non-basic mode laser of this zlasing mode purifier filtering efficiently of the present utility model and pumping light, and the energy efficient that will release out be converted to heat energy, be transmitted to like a cork then above systems such as fiber amplifier or fiber laser heat sink, thereby guaranteed the fail safe and the job stability of this zlasing mode purifier.
Though more than described embodiment of the present utility model, it will be understood by those of skill in the art that these only illustrate, protection range of the present utility model is limited by appended claims.Those skilled in the art can make numerous variations or modification to these execution modes under the prerequisite that does not deviate from principle of the present utility model and essence, but these changes and modification all fall into protection range of the present utility model.
Claims (8)
1. zlasing mode purifier, it is characterized in that, it comprises that a metal pedestal and wears the doubly clad optical fiber that is fixed in this metal pedestal, this doubly clad optical fiber comprises non-impurity-doped fibre core, inner cladding and the surrounding layer that refractive index reduces successively from the inside to the outside, this doubly clad optical fiber has at least two sections of releasing that are arranged in this metal pedestal and adjoin each other, each Duan Jun that releases has divested surrounding layer and scribbled glue-line on inner cladding, and the refractive index of the glue-line of each section of releasing increases successively or reduces successively but all greater than the refractive index of inner cladding.
2. zlasing mode purifier as claimed in claim 1 is characterized in that, the quantity of the described section of releasing is three.
3. zlasing mode purifier as claimed in claim 1 is characterized in that the length of each section of releasing is identical.
4. zlasing mode purifier as claimed in claim 1 is characterized in that, the glue-line of each section of releasing is ultra-violet curing glue material.
5. as any described zlasing mode purifier among the claim 1-4, it is characterized in that this metal pedestal comprises a cover plate and a base plate that interfixes, this base plate is provided with the groove that is used to shelve this doubly clad optical fiber.
6. zlasing mode purifier as claimed in claim 5 is characterized in that, the shape of cross section of this groove is semicircle.
7. zlasing mode purifier as claimed in claim 5 is characterized in that, this base plate is provided with a plurality of fixedly ears.
8. as any described zlasing mode purifier among the claim 1-4, it is characterized in that this metal pedestal is an aluminum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202936441U CN201774137U (en) | 2010-08-17 | 2010-08-17 | Laser mode purification unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202936441U CN201774137U (en) | 2010-08-17 | 2010-08-17 | Laser mode purification unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201774137U true CN201774137U (en) | 2011-03-23 |
Family
ID=43753975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202936441U Expired - Lifetime CN201774137U (en) | 2010-08-17 | 2010-08-17 | Laser mode purification unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201774137U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255235A (en) * | 2011-05-19 | 2011-11-23 | 中国科学院上海光学精密机械研究所 | Method for filtering cladding light in doubly clad optical fibers |
| CN102255227A (en) * | 2011-04-29 | 2011-11-23 | 中国科学院上海光学精密机械研究所 | Fiber cladding light filter and manufacturing method thereof |
| CN102621628A (en) * | 2012-03-22 | 2012-08-01 | 华中科技大学 | Optical fiber with ring-shaped doped layer and preparation method thereof and laser containing optical fiber |
| CN103676002A (en) * | 2013-11-29 | 2014-03-26 | 深圳市创鑫激光技术有限公司 | High-power fiber mode stripper |
| CN103904535A (en) * | 2014-03-31 | 2014-07-02 | 华中科技大学 | Cladding light filtering device for high-power optical fiber laser |
| CN104466637A (en) * | 2014-12-05 | 2015-03-25 | 中国电子科技集团公司第十一研究所 | Cladding light leaking device, optical fiber laser device and manufacturing method |
| CN105514772A (en) * | 2015-11-05 | 2016-04-20 | 北京工业大学 | Fiber laser higher-order mode stripper |
| CN106772810A (en) * | 2017-03-13 | 2017-05-31 | 佛山市莱拓科技有限公司 | Reduce back reflective doubly clad optical fiber attachment structure and doubly clad optical fiber |
| CN106785839A (en) * | 2016-12-16 | 2017-05-31 | 中国电子科技集团公司电子科学研究院 | A kind of optical fiber laser with super continuous spectrum |
| CN110380325A (en) * | 2019-07-31 | 2019-10-25 | 深圳市镭神智能系统有限公司 | A kind of fiber amplifier |
| CN110429459A (en) * | 2019-07-31 | 2019-11-08 | 深圳市镭神智能系统有限公司 | A kind of fiber amplifier |
-
2010
- 2010-08-17 CN CN2010202936441U patent/CN201774137U/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255227A (en) * | 2011-04-29 | 2011-11-23 | 中国科学院上海光学精密机械研究所 | Fiber cladding light filter and manufacturing method thereof |
| CN102255227B (en) * | 2011-04-29 | 2012-08-29 | 中国科学院上海光学精密机械研究所 | Fiber cladding light filter and manufacturing method thereof |
| CN102255235A (en) * | 2011-05-19 | 2011-11-23 | 中国科学院上海光学精密机械研究所 | Method for filtering cladding light in doubly clad optical fibers |
| CN102621628A (en) * | 2012-03-22 | 2012-08-01 | 华中科技大学 | Optical fiber with ring-shaped doped layer and preparation method thereof and laser containing optical fiber |
| CN103676002A (en) * | 2013-11-29 | 2014-03-26 | 深圳市创鑫激光技术有限公司 | High-power fiber mode stripper |
| CN103904535B (en) * | 2014-03-31 | 2017-01-18 | 华中科技大学 | Cladding light filtering device for high-power optical fiber laser |
| CN103904535A (en) * | 2014-03-31 | 2014-07-02 | 华中科技大学 | Cladding light filtering device for high-power optical fiber laser |
| CN104466637A (en) * | 2014-12-05 | 2015-03-25 | 中国电子科技集团公司第十一研究所 | Cladding light leaking device, optical fiber laser device and manufacturing method |
| CN105514772A (en) * | 2015-11-05 | 2016-04-20 | 北京工业大学 | Fiber laser higher-order mode stripper |
| CN105514772B (en) * | 2015-11-05 | 2018-07-06 | 北京工业大学 | A kind of optical-fiber laser higher order mode stripper |
| CN106785839A (en) * | 2016-12-16 | 2017-05-31 | 中国电子科技集团公司电子科学研究院 | A kind of optical fiber laser with super continuous spectrum |
| CN106772810A (en) * | 2017-03-13 | 2017-05-31 | 佛山市莱拓科技有限公司 | Reduce back reflective doubly clad optical fiber attachment structure and doubly clad optical fiber |
| CN110380325A (en) * | 2019-07-31 | 2019-10-25 | 深圳市镭神智能系统有限公司 | A kind of fiber amplifier |
| CN110429459A (en) * | 2019-07-31 | 2019-11-08 | 深圳市镭神智能系统有限公司 | A kind of fiber amplifier |
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Legal Events
| 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: 20110323 |