CN210605065U - Polarization maintaining optical fiber pump beam combiner and manufacturing device thereof - Google Patents
Polarization maintaining optical fiber pump beam combiner and manufacturing device thereof Download PDFInfo
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- CN210605065U CN210605065U CN201921480958.XU CN201921480958U CN210605065U CN 210605065 U CN210605065 U CN 210605065U CN 201921480958 U CN201921480958 U CN 201921480958U CN 210605065 U CN210605065 U CN 210605065U
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Abstract
The utility model relates to a fiber laser field specifically is a polarization maintaining optical fiber pumping beam combiner and making devices thereof, and it has included polarization maintaining optical fiber 1, pump optic fibre 2 as signal input channel, output optical fiber, its characterized in that: the polarization maintaining optical fiber switching fiber is characterized by further comprising a polarization maintaining optical fiber switching fiber 4, the polarization maintaining optical fiber switching fiber 4 is in mode matching with a polarization maintaining optical fiber 1 serving as a signal input channel through a mode matching section 3, the diameter of a fiber core at one end of the mode matching section 3 is the same as that of the fiber core of the polarization maintaining optical fiber 1, and a plurality of pumping optical fibers 2 are uniformly arranged outside the polarization maintaining optical fiber 1 after fusion splicing. The utility model discloses can solve current pumping beam combiner power low, stress hole easy damage, add the problem of man-hour polluted environment.
Description
Technical Field
The utility model relates to a fiber laser field specifically is a polarization maintaining optical fiber pumping beam combiner and making devices thereof.
Background
At present, all-fiber lasers composed of fiber devices, optical fibers and LD elements have been widely used in various laser processing and medical industries, and the demand of users for high-power lasers is increasing. Generally speaking, laser of a laser is converted from pump light, if a pump channel is too small, high-power laser cannot be obtained, and since a threshold exists in quartz per unit area in the process of transmitting laser, the larger the area of a pump fiber and a fiber core is, the higher the power which can be transmitted is.
In the prior art, a pumping fiber combiner with a non-polarization-maintaining fiber as a fiber core is manufactured into a common high-power beam combiner, while a polarization-maintaining fiber laser has a better application value due to the polarization-maintaining characteristic, but has a larger processing difficulty due to the existence of stress holes. The beam combining end of a common polarization maintaining fiber pump beam combiner adopts a structure of an equal-diameter fiber (i.e. the diameter of a pump fiber is the same as that of a polarization maintaining fiber, or the diameters of the pump fiber and the polarization maintaining fiber are the same by using an etching method), when the diameter of the polarization maintaining fiber exceeds that of the pump fiber more (for example, the diameter of the polarization maintaining fiber is more than twice that of the pump fiber), the polarization maintaining fiber pump beam combiner is easy to be excessively corroded in processing to cause stress hole damage, so that the polarization maintaining fiber pump beam combiner no. Therefore, the diameter of the polarization maintaining optical fiber which can be manufactured by the structure is not more than 250 μm, and meanwhile, the etching processing method also needs to utilize vacuum pumping to exhaust air between the quartz sleeve and the optical fiber and use hydrofluoric acid to etch the optical fiber, wherein the hydrofluoric acid belongs to strong etching chemicals and is harmful to human bodies. Therefore, a novel structure of the high-power polarization maintaining optical fiber pump beam combiner needs to be found, so that the beam combiner is convenient to process and more environment-friendly in process.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve among the prior art, stress hole fragile, add the problem that there is the bottleneck in polluted environment, power man-hour, provided a novel polarization maintaining pump beam combiner and production facility.
The utility model provides a polarization maintaining fiber pump beam combiner has included polarization maintaining fiber 1, pump fiber 2 as signal input channel, output fiber, its characterized in that: the polarization maintaining optical fiber switching fiber is characterized by further comprising a polarization maintaining optical fiber switching fiber 4, wherein the polarization maintaining optical fiber switching fiber 4 is arranged between a polarization maintaining optical fiber 1 serving as a signal input channel and an output optical fiber, the polarization maintaining optical fiber switching fiber 4 is in mode matching with the polarization maintaining optical fiber 1 serving as the signal input channel through a mode matching section 3 of the polarization maintaining optical fiber switching fiber, the mode matching section 3 is a conical body at the end of the polarization maintaining optical fiber switching fiber 4, the diameter of the connecting end of the conical body and the polarization maintaining optical fiber 1 of the signal input channel is the same as that of the fiber core of the polarization maintaining optical fiber 1 serving as the signal input channel, and a plurality of pumping optical fibers 2 are uniformly arranged outside the polarization maintaining optical fiber 1, the mode matching section 3 and the polarization maintaining optical.
The polarization maintaining optical fiber pumping beam combiner is characterized in that: the number of the pump fibers 2 is six.
An apparatus for manufacturing the polarization maintaining fiber pump beam combiner is characterized in that: the device comprises carbon dioxide optical fiber welding equipment, a polarization maintaining optical fiber clamp 5, an optical fiber bundle clamp 7, a left clamp 13 of tapering equipment, a glue curing system 8, a heating source 9, a cutting base plate 10, a right clamp 11 of tapering equipment, an end surface observation system 12 and a cutting knife 14; the carbon dioxide optical fiber fusion splicing equipment is used for heating and stretching the polarization maintaining optical fiber switching fiber 4 to form a mode matching section 3 and performing mode matching with the polarization maintaining optical fiber 1 serving as a signal input channel, the polarization maintaining optical fiber clamp 5 clamps the matched polarization maintaining optical fiber 1, the optical fiber bundle clamp 7 clamps one end of an optical fiber bundle 6 consisting of the polarization maintaining optical fiber 1 and the pump optical fiber 2, and the right clamp 11 of the tapering equipment clamps the other end of the optical fiber bundle 6 consisting of the polarization maintaining optical fiber switching fiber 4 and the pump optical fiber 2; the optical fiber bundle clamp 7 is fixed on a left clamp 13 of tapering equipment consisting of a high-precision guide rail and a support, the polarization maintaining optical fiber pump beam combiner is tensioned by moving the left clamp 13 of the tapering equipment, an end surface observation system 12 is used for observing the condition of the end surface of an optical fiber bundle, a heating source 9, a cutting base plate 10 and a cutting knife 14 are placed on the periphery of the optical fiber beam combiner and used for heating and cutting the optical fiber beam combiner, and a glue curing system 8 is used for injecting and curing glue.
The device for producing the polarization maintaining optical fiber pumping beam combiner is characterized in that: the optical fiber bundle clamp 7 is a thin-wall metal tube or a ceramic sleeve.
The device for producing the polarization maintaining optical fiber pumping beam combiner is characterized in that: the heating source 9 is a carbon dioxide laser and a graphite wire.
The device for producing the polarization maintaining optical fiber pumping beam combiner is characterized in that: the end surface observation system 12 has a magnification of ten times or more.
The device for producing the polarization maintaining optical fiber pumping beam combiner is characterized in that: the curing glue is ultraviolet curing glue or low-fluidity thermal curing glue.
The beneficial effects of the utility model reside in that:
the utility model discloses compare in prior art because the structure that has adopted the biconical taper can effectual protection polarization maintaining optical fiber's stress hole not destroyed to saved quartz capsule and the vacuum pumping system and be convenient for process, need not use strong corrosion chemicals such as hydrofluoric acid, make the technology more environmental protection. The size of the polarization maintaining fiber of the product can cover the size of 400 mu m and thicker, so that the polarization maintaining fiber can bear higher pumping power.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
FIG. 1 is an overall structural view;
FIG. 2 illustrates polarization maintaining fiber switching and mode matching;
FIG. 3 shows a tooling fixture countershaft;
FIG. 4 shows a detail of the end face of the fiber bundle;
FIG. 5. micro-melt heating;
FIG. 6 illustrates cutting of the molten cone;
in the figure: 1. polarization maintaining fiber 2, pumping fiber; 3. the device comprises a mode matching section, 4, polarization maintaining optical fiber switching fibers, 5, a polarization maintaining optical fiber clamp, 6, an optical fiber bundle, 7, an optical fiber bundle clamp, 8, a glue curing system, 9, a heating source, 10, a cutting base plate, 11, a tapering device right clamp, 12, an end face observation system, 13, a tapering device left clamp, 14 and a cutting knife.
Detailed Description
The utility model discloses a solve prior art and can't realize jumbo size polarization maintaining optical fiber pumping beam combiner, the stress hole is fragile easily, adds the problem of polluted environment man-hour, has provided a novel polarization maintaining pumping beam combiner and production facility thereof.
A high power polarization maintaining pump optical fiber combiner, its structure is shown in fig. 2, included as signal input channel polarization maintaining optical fiber 1, pump optical fiber 2, mode matching section 3, polarization maintaining optical fiber switching fiber 4's fibre core diameter slightly is greater than as signal input channel polarization maintaining optical fiber 1's fibre core diameter, mode matching section 3 is the toper part that produces to polarization maintaining optical fiber switching fiber 4's one section fibre core heating diffusion and supplementary tensile back, mode matching section 3 is the same with the fibre core diameter as signal input channel polarization maintaining optical fiber 1's fibre core diameter as the part that signal input channel polarization maintaining optical fiber 1 is connected, mode matching section 3 matches with the mode as signal input channel polarization maintaining optical fiber 1's mode, several pump optical fiber 2 is outside evenly arranged at the polarization maintaining optical fiber after the butt fusion. The number of the pumping fibers 2 can be selected from three, four, six, eight, etc. according to the required power and the difference between the diameters of the polarization maintaining fibers and the pumping fibers.
In order to make above-mentioned polarization maintaining optical fiber pump beam combiner, the utility model discloses still provide one set of corresponding equipment, this equipment overall structure is shown as figure 1, included carbon dioxide optical fiber fusion equipment, polarization maintaining optical fiber anchor clamps 5, fiber bundle anchor clamps 7, draw awl equipment left side anchor clamps 13, glue curing system 8, heating source 9, cutting backing plate 10, draw awl equipment right side anchor clamps 11, terminal surface observation system 12, cutting knife 14 and constitute.
The carbon dioxide optical fiber fusion splicing device is arranged outside the system and used for heating and stretching the polarization-maintaining optical fiber adapter fiber 4 to form a mode matching section 3 and match with the polarization-maintaining optical fiber 1 serving as a signal input channel in a mode.
The polarization maintaining optical fiber clamp 5 clamps the matched polarization maintaining optical fiber 1 serving as a signal input channel, the right side clamp 11 of the tapering device clamps the optical fiber bundle 6 consisting of the polarization maintaining optical fiber switching fiber 4 and the pump optical fiber 2, the optical fiber bundle clamp 7 clamps the optical fiber bundle consisting of the polarization maintaining optical fiber 1 serving as the signal input channel and the pump optical fiber 2, the optical fiber bundle clamp is installed on the left side clamp 13 of the tapering device consisting of a high-precision guide rail and a support, and the optical fiber combiner is tensioned through the left side clamp 13 of the tapering device. The fiber bundle clamp 7 can be fabricated using a structure such as a thin-walled metal sleeve, a ceramic sleeve, or the like.
The end face observation system 12 is placed on the outer side of the end of the right clamp 11 of the tapering device and used for observing the condition of the end face of the optical fiber bundle 6, and the magnification of the end face observation system 12 is larger than 10 times.
A heating source 9 made of a carbon dioxide laser or a graphite wire, a cutting backing plate 10 and a cutting knife 14 are arranged on the periphery of the optical fiber combiner and used for heating and cutting the optical fiber combiner, and a glue curing system 8 is used for injecting and curing glue which can be ultraviolet curing glue or thermal curing glue with low liquidity.
Use production device can produce through following step polarization maintaining optical fiber pumping beam combiner, it includes polarization maintaining optical fiber switching and mode matching, frock clamp counter shaft, little melting heating, four steps of fused cone cutting are constituteed.
The method comprises the following steps: polarization maintaining optical fiber switching and mode matching
A polarization maintaining optical fiber adapter fiber 4 with the fiber core size larger than that of a polarization maintaining optical fiber 1 used as a signal input channel is connected to the polarization maintaining optical fiber 1 used as the signal input channel of a polarization maintaining optical fiber pumping beam combiner, one end of the polarization maintaining optical fiber adapter fiber 4 is stretched by adopting a fiber core heating diffusion and auxiliary stretching method to generate a conical part, the fiber core diameter of the polarization maintaining optical fiber adapter fiber 4 at the stretching end is ensured to be the same as that of the polarization maintaining optical fiber 1 used as the signal input channel, and then the stretching section is subjected to mode matching with the polarization maintaining optical fiber 1 used as the signal input channel.
Step two: tool clamp counter shaft
A plurality of (three, four, six, eight, etc.) pump fibers 2 are wound around a polarization maintaining fiber 1 serving as a signal input channel to form a fiber bundle 6, and a special fiber bundle clamp 7 (for example, but not limited to, a thin-wall metal sleeve, a ceramic sleeve, etc.) is used to clamp the formed fiber bundle 6 (the length of the fiber bundle is usually 50-150 mm), the outer ring of the plurality of pump fibers is fixed by glue (usually, for convenience of operation, ultraviolet curing glue or heat curing glue with low fluidity is used), and after completion, the polarization maintaining fiber located in the center of the outer ring of the pump fibers is in a loose state, as shown in fig. 3. Combing the optical fiber bundle 6 and aligning the end face thereof to an end face observation system 12 (the amplification factor of the end face should be more than 10 times), observing the positions of the polarization maintaining optical fiber and the pumping optical fiber, as shown in fig. 4, driving a clamp for clamping the polarization maintaining optical fiber by a motor to slowly rotate around the axis of the clamp, adjusting the positions of the polarization maintaining optical fiber and the surrounding pumping optical fiber, after reaching the expected angle position, injecting high-fluidity glue into the gaps between the polarization maintaining optical fiber and the six outer rings of optical fibers by a needle cylinder, curing, and maintaining the tension of the optical fiber bundle by using a special clamp while curing so as to prevent the optical fiber bundle from crossing after curing. The clamp can be made of low-melting-point metal or a cement clamp, and the optical fiber can be fixed under the condition that the optical fiber is not damaged.
Step three: micro-melting heating
One end of an optical fiber bundle 6 is fixed on a right clamp 11 of the tapering device, the other end is fixed on a left clamp 13 of the tapering device through an optical fiber bundle clamp 7, the left clamp 13 of the tapering device comprises a high-precision guide rail driven by a stepping motor, the optical fiber bundle 6 is heated by oxyhydrogen flame (carbon dioxide laser or graphite wire can also be used as a heat source), the heating degree is just right, the optical fiber bundle reaches the softening temperature and is adhered together, in order to prevent the optical fiber from sagging due to gravity when being softened, the heating temperature is strictly controlled in the heating process, and slight tension is applied to the optical fiber, so that the optical fiber is kept in a stretched state, as shown in fig. 5.
Step four: broach cutting
As shown in fig. 6, a heating source 9 performs reciprocating scanning heating on the adhered optical fiber bundle to deeply melt the optical fibers, a tapering device is used to taper the heated area of the optical fiber bundle while heating, a cutting device (including a cutting knife 14 and a cutting pad plate 10) then cuts the optical fiber bundle 6 containing the polarization maintaining optical fiber, because the internal specific stress body and peripheral quartz material of the polarization maintaining optical fiber are fragile, the cutting tension needs to be reduced by 15% -40% compared with that of the conventional optical fiber with the same size, and meanwhile, a cutting pad plate 10 is placed at a symmetrical position of a cutting point by taking the optical fiber core as the center of a circle and is used for supporting the optical fiber to prevent the cut optical fiber from excessive deformation, and the cutting pad plate 1 is usually about 50-200 μm away from the optical fiber bundle.
And after cutting, taking the optical fiber off the clamp from the clamp, and finishing the manufacturing of the polarization maintaining optical fiber beam combiner.
The following further illustrates the present invention by way of specific examples:
in the embodiment, a PLMA-GDF-20/400-M type optical fiber of Nufern company is used as a polarization maintaining optical fiber 1 of a signal input channel, and a MM-200/220-22A optical fiber is used as a pump optical fiber 2, in the manufacturing process, a PLMA-GDF-30/250 (the length of a splicing optical fiber is 50-100 MM) is adopted as a polarization maintaining optical fiber switching fiber 4, a special carbon dioxide optical fiber welding device is adopted for heating and stretching, a mode matching section 3 with the length of 5-10MM is manufactured at one end of the polarization maintaining optical fiber switching fiber 4, and is welded with the polarization maintaining optical fiber 1 of the polarization maintaining optical fiber, which is used as the signal input channel; the continuous PLMA-GDF-30/250 optical fiber and six pump optical fibers are penetrated into a quartz capillary with the inner diameter of 700 μm together, an end surface observation system 12 with the magnification of 20 times is used for observing the end surface state of the seven optical fibers after penetrating out of the quartz capillary (the optical fiber penetrating out of the capillary is about 40-90 mm), and the polarization maintaining optical fiber 1 of the polarization maintaining optical fiber as a signal input channel is adjusted and ensured to be positioned at the geometric center of the six pump optical fibers; adopting ultraviolet curing glue to fix 6 pumping fibers on the outer layer of the optical fiber bundle, fixing one end of a polarization maintaining optical fiber 1 serving as a signal input channel of the polarization maintaining optical fiber on a clamp, driving the clamp to rotate by a motor, slowly changing the axial angle of the polarization maintaining optical fiber 1 serving as the signal input channel of the polarization maintaining optical fiber in the optical fiber bundle, and confirming that the position of a stress hole is aligned with the tangential position between the pumping fibers by utilizing an end surface observation system 12, as shown in the attached figure 4; (in the same way, when the pump coupler has special requirements, the stress hole can be aligned with the connecting line of the pump fiber and the polarization maintaining fiber by using the method), then ultraviolet light curing glue with low refractive index is used for injecting the capillary, and curing is carried out after the capillary is fully filled in the gap between the polarization maintaining fiber and the pump fiber; sleeving the end face of the optical fiber bundle with the inner diameter of 700 mu m in a sleeving manner, injecting glue for solidification, keeping the integral state of the optical fiber bundle not to be distorted, then carrying out micro-melting heating on the optical fiber bundle between two quartz capillaries in the optical fiber bundle by using a carbon dioxide laser, and ensuring that the optical fiber bundle has certain tension in the heating process, the optical fibers are mutually molten, but the integral deformation is less than 10 mu m (the deformation can be observed through the side face), and the length of the mutual molten optical fibers is about 3-8 cm; then, carrying out deep melting tapering on the optical fiber bundle by adopting oxyhydrogen flame (hydrogen flow is about 200-500 ml/min, oxygen flow is 100-200 ml/min), wherein the stretching length is about 10-15mm, and the diameter of an external circle of the thinnest part of the tapered optical fiber bundle is 300 mu m; an optical fiber cutter is adopted to accurately cut the thinnest part of the optical fiber cone, during cutting, the cut optical fiber is protected by a cutting backing plate, the radial deformation of the optical fiber cone generated by the collision of the cutter is smaller than 200 mu m, and after cutting is completed, a linear polarization 1064nm light source is utilized, and the optical power loss caused by actual measurement switching is smaller than 4%; and (3) welding the cut end face with the PLMA-GDF-20/400-M optical fiber (the welding step does not relate to the protection scope of the patent and is not described), and finishing the manufacture of the high-power polarization-maintaining optical fiber combiner.
The polarization extinction ratio attenuation of the beam combiner is 1.5-3dB through testing, the optical loss of the finished product signal of the polarization-maintaining pump beam combiner is 7%, and the average pump coupling efficiency is more than or equal to 97%. The utility model discloses because the tensile mode of fused cone has been adopted in the method, and the method of not using the corruption, the stress hole that can effectual protection polarization maintaining optical fiber is not destroyed. Meanwhile, the size of the signal fiber and the size of the pumping fiber are not required, the application range is wider, a quartz tube and a vacuum pumping system are omitted, the processing is convenient, and strong corrosive chemicals such as hydrofluoric acid are not required, so that the manufacturing process is more environment-friendly.
The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in various other embodiments according to the present invention, so that the protection scope of the present invention is subject to the claims.
Claims (7)
1. The utility model provides a polarization maintaining fiber pump beam combiner, has included polarization maintaining fiber (1), pump fiber (2), the output fiber as signal input channel, its characterized in that: the polarization maintaining optical fiber switching fiber is characterized by further comprising a polarization maintaining optical fiber switching fiber (4), the polarization maintaining optical fiber switching fiber (4) is arranged between the polarization maintaining optical fiber (1) serving as a signal input channel and an output optical fiber, the mode matching section (3) of the polarization maintaining optical fiber switching fiber (4) is in mode matching with the polarization maintaining optical fiber (1) serving as a signal input channel, the mode matching section (3) is a conical body at the end of the polarization maintaining optical fiber switching fiber (4), the diameter of the connecting end of the conical body and the polarization maintaining optical fiber (1) of the signal input channel is the same as that of the fiber core of the polarization maintaining optical fiber (1) serving as the signal input channel, and a plurality of pumping optical fibers (2) are uniformly arranged outside the polarization maintaining optical fiber (1), the mode matching section (3) and the polarization maintaining optical fiber switching fiber (4) after mode matching.
2. The polarization maintaining fiber pump combiner of claim 1, wherein: the number of the pump fibers (2) is six.
3. An apparatus for making the polarization maintaining fiber pump combiner of claim 1 or 2, wherein: the device comprises carbon dioxide optical fiber welding equipment, a polarization maintaining optical fiber clamp (5), an optical fiber bundle clamp (7), a glue curing system (8), a heating source (9), a cutting base plate (10), a right clamp (11) of tapering equipment, an end face observation system (12), a left clamp (13) of tapering equipment and a cutting knife (14); the carbon dioxide optical fiber welding equipment is used for heating and stretching the polarization maintaining optical fiber switching fiber (4) to form a mode matching section (3) and performing mode matching with the polarization maintaining optical fiber (1) serving as a signal input channel, a polarization maintaining optical fiber clamp (5) clamps the matched polarization maintaining optical fiber (1), an optical fiber bundle clamp (7) clamps one end, formed by the polarization maintaining optical fiber (1) and the pump optical fiber (2), of an optical fiber bundle (6), and a right clamp (11) of the tapering equipment clamps the other end of the optical fiber bundle (6) formed by the polarization maintaining optical fiber switching fiber (4) and the pump optical fiber (2); the optical fiber bundle clamp (7) is fixed on a left clamp (13) of tapering equipment consisting of a high-precision guide rail and a support, a polarization maintaining optical fiber pump beam combiner is tensioned by moving the left clamp (13) of the tapering equipment, an end surface observation system (12) is used for observing the end surface condition of an optical fiber bundle, a heating source (9), a cutting base plate (10) and a cutting knife (14) are placed on the periphery of the optical fiber beam combiner and used for heating and cutting the optical fiber beam combiner, and a glue curing system (8) is used for injecting and curing glue.
4. The apparatus of claim 3, wherein: the optical fiber bundle clamp (7) is a thin-wall metal tube or a ceramic sleeve.
5. The apparatus of claim 3, wherein: the heating source (9) is a carbon dioxide laser and a graphite wire.
6. The apparatus of claim 3, wherein: the magnification of the end surface observation system (12) is more than ten times.
7. The apparatus of claim 3, wherein: the curing glue is ultraviolet curing glue or low-fluidity thermal curing glue.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441856A (en) * | 2019-09-06 | 2019-11-12 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | A kind of polarization maintaining optical fibre pump combiner and its producing device and method |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441856A (en) * | 2019-09-06 | 2019-11-12 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | A kind of polarization maintaining optical fibre pump combiner and its producing device and method |
| CN110441856B (en) * | 2019-09-06 | 2023-11-28 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | Polarization maintaining fiber pump beam combiner and manufacturing device and method thereof |
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