CN202059041U - Distributed side-pumped fiber laser with antireflection layer structure - Google Patents
Distributed side-pumped fiber laser with antireflection layer structure Download PDFInfo
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- CN202059041U CN202059041U CN2011201743520U CN201120174352U CN202059041U CN 202059041 U CN202059041 U CN 202059041U CN 2011201743520 U CN2011201743520 U CN 2011201743520U CN 201120174352 U CN201120174352 U CN 201120174352U CN 202059041 U CN202059041 U CN 202059041U
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Abstract
The utility model discloses a distributed side-pumped fiber laser with an antireflection layer structure, and relates to the industrial processing and military field. The laser includes a fiber, a pumping source (5), a first fiber grating (41), and a second fiber grating (42). The fiber includes a fiber core (1), a cladding (2), and an antireflection layer (3). The antireflection layer (3) is an antireflection film or an antireflection structure which is composed of quartz mediums which have alternating refractive indexes. For the antireflection layer (3), the number of the layers which have alternating refractive indexes is N, and N equals to 5-50. The fiber is divided into an inner cladding (21) and an external cladding (22). The refractive index of the fiber core (1) is 1.4-1.8, and the refractive index of the cladding (2) is 1.3-1.7. The refractive indexes of the N layers of the quartz mediums are alternating, the high refractive index is 1.7-1.9, and the low refractive index is 1.2-1.4. The distributed side-pumped fiber laser with the transmission enhanced layer structure solves the problem of high processing difficulty of a large-power fiber laser under a conventional side-pumped technology. The conventional side-pumped technology can cause mechanical damage to the fiber, so the mechanical strength of the fiber is greatly reduced. The distributed side-pumped fiber laser with the transmission enhanced layer structure also solves the problem of fiber damage caused by the nonuniform distribution of the pumping energy in the fiber.
Description
Technical field
The utility model relates to a kind of fiber laser.Be applied to high power laser output field, industrial processes field and military field especially.
Background technology
Since laser comes out, its good light characteristic has obtained approval widely, development along with technology, the power of laser is increasing, the application of laser in fields such as part processing, optical communication and national defence of high-power special mould field obtains people's attention day by day, and its application fields makes people increasing to the input of this laser.Though the power of laser has had certain lifting, the power output of single-mode laser can't reach actual demand.Especially the fiber laser development in recent years is the rapidest, and this does well out of device structure of its compactness and high conversion efficiency, but along with the continuous development of technology, the continuous progress of the research degree of depth, some restrictions of laser also progressively display.At first one is exactly to want further to promote laser output power, and the mode of pumping is still waiting to improve, and usual end face pumping mode causes damage to fiber end face when its drawback is to carry out high power pump easily at present.So people adopt the form of profile pump, but still be a some access way, compare end pumping completely and can effectively reduce damage optical fiber, but owing to the reason of machining can affect greatly the mechanical strength of optical fiber.
The fiber laser profile pump technology that adopts is as follows at present:
Multimode fiber pyrometric cone profile pump coupled modes.Multimode fiber fused biconical taper directional couple is that many bare fibers 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 fiber by the doubly clad optical fiber side, thereby realize coupling pump Pu, directed side.This method is because the manufacturing process of fused biconical taper makes the coupling place optical fiber structure at pumping optical fiber and multimode Active Optical Fiber that variation take place, and this raising for laser power and quality is unfavorable.
The coupling of V groove profile pump.This technology is removed the doubly clad optical fiber surrounding layer a bit of earlier, etches a V groove at exposed inner cladding then, and an inclined-plane of groove also can all be used for two faces reflection as reflecting surface.Pump light is coupled through lenticule by semiconductor laser, and pump light is converged in the side of V groove, enters the doubly clad optical fiber inner cladding through changing direction after the offside reflection, thereby along the axial transmission of optical fiber.In order to improve coupling efficiency, this method requires the V-type reflection groove to the pump light total reflection.The V-type groove makes the mechanical strength of optical fiber descend greatly to the wound of optical fiber, and because the manufacture craft requirement of V-type groove is too high, all is unfavorable for popularizing and using of superpower laser.
Embed reflection mirror pumping coupling.Similar with V-type groove method, embedding reflection mirror pumping coupling also need slot at optical fiber side, this is improving one's methods of V-type groove in fact, the same with V groove side coupling pump technology, embedding reflection mirror pumping coupling technique also has than lossy for the transmission of inner cladding inside-pumping light, be unfavorable for the expansion that the multiple spot coupling injects pump power equally, and mechanical strength descends equally greatly.
The coupling of angle grinding and polishing profile pump.Its basic principle is to go a bit ofly at doubly clad optical fiber, peels off overlay and surrounding layer, and inner cladding is longitudinally carried out grinding and polishing, obtains the plane of segment in order to the coupling pump light.It is good then the end face of the fibre core of pumping optical fiber to be pressed the certain angle grinding and polishing, fits tightly fixing with optical fiber.Pump light through pumping optical fiber to optical fiber side-pumping.What this method and fiber angle grinding and polishing side coupling pump technology were similar is 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.
In sum, the profile pump technology difficulty of processing height of existing high power laser has mechanical damage to optical fiber, and the mechanical strength of optical fiber is seriously reduced; The optical fiber of optical fiber side-pumping technology is compared the optical fiber other parts and is wanted high with the Coupling point place optical power density of pumping source, the Coupling point place is produced damage.
The utility model content
Technical problem to be solved in the utility model is:
The profile pump technology difficulty of processing height of large-power optical fiber laser has mechanical damage to optical fiber at present, and the mechanical strength of optical fiber is seriously reduced; The optical fiber of optical fiber side-pumping technology is compared the optical fiber other parts and is wanted high with the Coupling point place optical power density of pumping source, the Coupling point place is produced damage.
The technical solution of the utility model:
Have the distributed profile pump fiber laser of antireflection layer structure, comprising: optical fiber, pumping source, first fiber grating and second fiber grating.
Described optical fiber comprises fibre core, covering and antireflection layer.
The antireflection layer structure is the anti-reflection structure that the alternate quartz medium of anti-reflection film or refractive index height is formed, and is positioned at the optical fiber outermost layer.
The refractive index of described fibre core is 1.4～1.8, and the refractive index of covering is 1.3～1.7, and the high index of refraction quartz medium refractive index of light collecting layer is 1.7～1.9, and low-refraction quartz medium refractive index is 1.2～1.4.
The radius of described fibre core is 2 μ m～50 μ m, and the optical fiber outer radius is 50 μ m～1000 μ m, and the thickness of antireflection layer is 5 μ m～50 μ m.
The number of plies that high low-refraction is alternate in the described antireflection layer is 5～50.
Described covering is the double clad structure, is divided into inner cladding and surrounding layer, and refractive index is all between 1.3～1.7, and inner cladding refractive index is greater than cladding refractive index, and inner cladding is shaped as D shape, circle, star and rectangle.
The pump mode of described pumping source is the distributed pumping in side, and promptly the pumping source direct irradiation is in optical fiber side.
The utility model is compared the beneficial effect that is had with prior art:
Owing in optical fiber, adopt antireflection layer, make that coupled modes change in big merit fiber laser, in optical fiber, there is not the extreme inhomogeneities of power density, make the effective power carrying upper limit of optical fiber obtain tremendous increase; Compare with present existing profile pump technology, optical fiber structure shown in the utility model need not to do any machining during as gain medium, this body structure of optical fiber is not caused any damage, has guaranteed the mechanical strength of optical fiber; The introducing of the peripheral antireflection layer of optical fiber makes that profile pump efficient is effectively promoted simultaneously, has increased the power output of high power fiber laser greatly; The distributed pump mode in the used side of the utility model be the pumping source direct irradiation in optical fiber side, make pump light be distributed in optical fiber surface uniformly, pump light sees through antireflection layer and enters inside of optical fibre.The optical fiber fabrication method is simple, can be competent at fully with the multilayer fibers manufacturing technology or the coating technique of present maturation, need not special process.
Description of drawings
Fig. 1 has the distributed profile pump fiber laser of antireflection layer structure.
The end view drawing of Fig. 2 optical fiber.
Fig. 3 inner cladding is the distributed profile pump fiber laser that has the antireflection layer structure of rectangle.
Fig. 4 inner cladding is the fiber end face figure of rectangle.
Fig. 5 inner cladding is the distributed profile pump fiber laser that has the antireflection layer structure of star.
Fig. 6 inner cladding is the fiber end face figure of star.
Fig. 7 inner cladding is the distributed profile pump fiber laser that has the antireflection layer structure of D shape.
Fig. 8 inner cladding is the fiber end face figure of D shape.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
Execution mode one
Have the distributed profile pump fiber laser of antireflection layer structure, as Fig. 1,2, this laser comprises: optical fiber and pumping source 5, the first fiber gratings 41 and second fiber grating 42.
Described optical fiber comprises: fibre core 1, covering 2 and at the antireflection layer 3 of covering 2 outsides.
The structure of antireflection layer 3 is an anti-reflection film.
The refractive index of described fibre core 1 is 1.4, and the refractive index of covering 2 is 1.3.
The radius of described fibre core 1 is 2 μ m, and the outer radius of optical fiber is 50 μ m, and the thickness of antireflection layer 3 is 5 μ m.
The pump mode of described pumping source 5 is the distributed pumping in side, and promptly pumping source 5 direct irradiations are in optical fiber side.
Execution mode two
Have the distributed profile pump fiber laser of antireflection layer structure, as Fig. 3,4, this laser comprises: optical fiber and pumping source 5, the first fiber gratings 41 and second fiber grating 42.
Described optical fiber comprises: fibre core 1, covering 2 and at the antireflection layer 3 of covering 2 outsides.
The structure of described antireflection layer 3 is five layers of alternate quartz medium of refractive index height.The refractive index that wherein refractive index of ground floor quartz medium 31 is 1.9, the refractive index of second layer quartz medium 32 is 1.4, the 3rd layers of quartz medium 33 is that the refractive index of 1.9, the 4th layers of quartz medium 34 is 1.4, the refractive index of layer 5 quartz medium 35 is 1.9.
The refractive index of described fibre core 1 is 1.8.
The radius of described fibre core 1 is 50 μ m, and the outer radius of optical fiber is 1000 μ m, and the thickness of antireflection layer 3 is 50 μ m.
Described covering 2 is divided into inner cladding 21 and surrounding layer 22 double-deckers.
The refractive index of described inner cladding 21 be 1.4 and the refractive index of surrounding layer 22 be 1.3, inner cladding 21 be shaped as rectangle.
The pump mode of described pumping source 5 is the distributed pumping in side, and promptly pumping source 5 direct irradiations are in optical fiber side.
Execution mode three
Have the distributed profile pump fiber laser of antireflection layer structure, as Fig. 5,6, this laser comprises: optical fiber and pumping source 5, the first fiber gratings 41 and second fiber grating 42.
Described optical fiber comprises: fibre core 1, covering 2 and at the antireflection layer 3 of covering 2 outsides.
The structure of antireflection layer 3 is 20 layers of alternate quartz medium of refractive index height.
The refractive index of described fibre core 1 is 1.6.
The refractive index of 20 layers of quartz medium: the refractive index that the refractive index of ground floor quartz medium 31 is 1.8, the refractive index of second layer quartz medium 32 is 1.3, the 3rd layers of quartz medium 33 be the refractive index of 1.8, the 4th layers of quartz medium 34 be 1.3 ..., the refractive index of the 19 layer of quartz medium 319 is that the refractive index of 1.8, the 20 layers of quartz medium 320 is 1.3.
The radius of described fibre core 1 is 20 μ m, and the outer radius of optical fiber is 500 μ m, and the thickness of antireflection layer 3 is 20 μ m.
Described covering 2 comprises inner cladding 21 and surrounding layer 22 double-deckers.
The refractive index of described inner cladding 21 be 1.5 and the refractive index of surrounding layer 22 be 1.4, inner cladding 21 be shaped as star.
The pump mode of described pumping source 5 is the distributed pumping in side, and promptly pumping source 5 direct irradiations are in optical fiber side.
Execution mode four
Have the distributed profile pump fiber laser of antireflection layer structure, as Fig. 7,8, this laser comprises: optical fiber and pumping source 4.
Described optical fiber comprises: fibre core 1, covering 2 and at the antireflection layer 3 of covering 2 outsides.
The structure of antireflection layer 3 is 50 layers of alternate quartz medium of refractive index height.
The refractive index of described fibre core 1 is 1.8.
The refractive index of 50 layers of quartz medium: the refractive index that the refractive index of ground floor quartz medium 31 is 1.7, the refractive index of second layer quartz medium 32 is 1.2, the 3rd layers of quartz medium 33 be the refractive index of 1.7, the 4th layers of quartz medium 34 be 1.2 ..., the 49 layer of quartz medium 349 refractive index be that the refractive index of 1.7, the 50 layers of quartz medium 350 is 1.2.
The radius of described fibre core 1 is 20 μ m, and the outer radius of optical fiber is 200 μ m, and the thickness of antireflection layer 3 is 30 μ m.
Described covering 2 comprises inner cladding 21 and surrounding layer 22 double-deckers.
The refractive index of described inner cladding 21 be 1.7 and the refractive index of surrounding layer 22 be 1.6, inner cladding 21 be shaped as D shape.
The pump mode of described pumping source 4 is the distributed pumping in side, and promptly pumping source 4 direct irradiations are in optical fiber side.
Claims (6)
1. the distributed profile pump fiber laser that has the antireflection layer structure comprises optical fiber, pumping source (5), first fiber grating (41) and second fiber grating (42), it is characterized in that:
Described optical fiber comprises fibre core (1), covering (2) and antireflection layer (3);
Antireflection layer (3) structure is the anti-reflection structure that the alternate quartz medium of anti-reflection film or refractive index height is formed, and is positioned at the optical fiber outermost layer.
2. the distributed profile pump fiber laser that has the antireflection layer structure according to claim 1 is characterized in that:
The refractive index of described fibre core (1) is 1.4～1.8, and the refractive index of covering (2) is 1.3～1.7, and the high index of refraction quartz medium refractive index of light collecting layer (3) is 1.7～1.9, and low-refraction quartz medium refractive index is 1.2～1.4.
3. the distributed profile pump fiber laser that has the antireflection layer structure according to claim 1 is characterized in that:
The radius of described fibre core (1) is 2 μ m～50 μ m, and the optical fiber outer radius is 50 μ m～1000 μ m, and the thickness of antireflection layer (3) is 5 μ m～50 μ m.
4. the distributed profile pump fiber laser that has the antireflection layer structure according to claim 1 is characterized in that:
The number of plies that high low-refraction is alternate in the described antireflection layer (3) is 5～50.
5. the distributed profile pump fiber laser that has the antireflection layer structure according to claim 1 is characterized in that:
Described covering (2) is the double clad structure, is divided into inner cladding (21) and surrounding layer (22), and refractive index is all between 1.3～1.7, and inner cladding (21) refractive index is greater than surrounding layer (22) refractive index, and inner cladding is shaped as D shape, circle, star and rectangle.
6. the distributed profile pump fiber laser that has the antireflection layer structure according to claim 1 is characterized in that:
The pump mode of described pumping source (5) is the distributed pumping in side, and promptly pumping source (5) direct irradiation is in optical fiber side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201743520U CN202059041U (en) | 2011-05-27 | 2011-05-27 | Distributed side-pumped fiber laser with antireflection layer structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201743520U CN202059041U (en) | 2011-05-27 | 2011-05-27 | Distributed side-pumped fiber laser with antireflection layer structure |
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| Publication Number | Publication Date |
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| CN202059041U true CN202059041U (en) | 2011-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201743520U Expired - Fee Related CN202059041U (en) | 2011-05-27 | 2011-05-27 | Distributed side-pumped fiber laser with antireflection layer structure |
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| Country | Link |
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| CN (1) | CN202059041U (en) |
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2011
- 2011-05-27 CN CN2011201743520U patent/CN202059041U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111130 Termination date: 20120527 |