CN111522097A - Ultra-low-loss large-mode-field optical fiber side pumping beam combiner and manufacturing method thereof - Google Patents
Ultra-low-loss large-mode-field optical fiber side pumping beam combiner and manufacturing method thereof Download PDFInfo
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- CN111522097A CN111522097A CN202010358277.7A CN202010358277A CN111522097A CN 111522097 A CN111522097 A CN 111522097A CN 202010358277 A CN202010358277 A CN 202010358277A CN 111522097 A CN111522097 A CN 111522097A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/245—Removing protective coverings of light guides before coupling
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2551—Splicing of light guides, e.g. by fusion or bonding using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
- H01S3/094019—Side pumped fibre, whereby pump light is coupled laterally into the fibre via an optical component like a prism, or a grating, or via V-groove coupling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094049—Guiding of the pump light
- H01S3/094053—Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle
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Abstract
The invention discloses an ultra-low loss large mode field optical fiber side pumping beam combiner and a manufacturing method thereof, wherein the method comprises the following steps: removing the coating layer at the corresponding fusion joint part in the large mode field signal fiber and the pump fiber to expose the inner cladding; respectively and tightly attaching the bare cladding layers of the two pump optical fibers to two sides of the cladding layer of the large mode field signal optical fiber to form an optical fiber bundle; then, carrying out sintering heating on the cladding region in the optical fiber bundle; and stretching the optical fiber bundle when the large mode field signal optical fiber is heated to a molten state, so that the size of a molten area in the large mode field signal optical fiber is thinned and reduced to form a tapered structure with two symmetrical ends, then the optical fiber bundle is restored to room temperature to form a solid state, and the large mode field signal optical fiber and the pump optical fiber are welded into a whole. The invention reduces the tiny deformation of the large mode field signal optical fiber caused by machine, clamp, gravity and thermal stress factors by properly thinning the optical fiber in the sintering process, thereby ensuring that the distortion degree of the basic mode signal is very small when the basic mode signal passes through the sintering area.
Description
Technical Field
The invention belongs to the technical field of optical fibers, and particularly relates to an ultra-low-loss large-mode-field optical fiber side pumping beam combiner and a manufacturing method thereof.
Background
High-power fiber lasers have been widely used in the fields of industrial processing, medical treatment, national defense and military, etc. In the optical fiber laser, the performance of the high-power optical fiber device is important. The large-mode-field optical fiber has a large core diameter area, so that the threshold of nonlinear effects (SPM, SBS, SRS and the like) can be improved, and the characteristics of pulse width, spectrum width and the like of signal light are ensured not to be changed. Therefore, large mode field fibers are suitable for high average power transmission and have been widely used in the field of high power fiber lasers.
There is a very important parameter in the design of optical fibers: normalizing the frequency (V parameter) to measure the number of allowable transmission modes in the fiber; when V is less than 2.405, only the fundamental mode can be transmitted, which is called a single-mode fiber, and the fiber body of the single-mode fiber is generally very small (<6um), and the NA is large; and the large mode field fiber is not a single mode fiber generally, V is greater than 2.405, the core diameter is large (10-50um), the V parameter is reduced by reducing the NA, the number of allowable transmission modes is controlled, and therefore better beam quality is maintained.
The normalized frequency (vparameter) of a large mode field fiber is large, so it is not a single mode fiber, allowing multiple modes to be transmitted in the fiber; in practical application, due to the influence of external factors or the change of the self morphological structure of the large-mode-field optical fiber, part of fundamental mode signals are converted into high-order modes, so that the quality of light beams is reduced.
When the large mode field optical fiber is used for manufacturing a high-power optical fiber device, a process step of sintering is often needed, the optical fiber is heated and softened to reach a molten state, and then is fused with other optical fibers. For example, when a side pump beam combiner with signal input and output both being large mode field optical fibers is manufactured, the pump optical fibers need to be attached to the surfaces of the large mode field signal optical fibers and be fused together. At present, the signal loss of the basic mode of the device in industrial application is generally more than 0.5 dB.
The large mode field optical fiber is subjected to micro deformation in the process of fusion sintering, and the micro deformation is mainly related to the following factors:
1) due to the influence of the machine and the clamp, the vibration of the machine can deform the optical fiber in a molten state, and the micro dislocation of the fixed clamps at the two sides causes the microscopic dislocation of a sintering area.
2) Influence of thermal stress: the sintering process only occurs in a small section of area in the middle of the large-mode-field-diameter optical fiber, the sintering area is heated to a molten state, but the optical fibers on two sides are still in a solid state, and the sintering area can be bent under the influence of thermal stress.
3) Gravity causes the molten region of the fiber to sag, bending microscopically.
In the current industrial application, the core diameter of the large mode field optical fiber is generally 10-30um, the micro deformation caused by the factors can easily reach more than 10um, the shape structure, the coaxiality and the symmetry of the core diameter are obviously changed, the injected fundamental mode signal can be excited into a high-order mode through a sintering area, and the loss of the fundamental mode signal is increased.
The large loss of the fiber device results in the laser needing higher pump power to reach the same power output, which introduces more noise, thereby reducing the overall performance and reliability, and the distorted higher-order modes also reduce the output beam quality of the laser.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a manufacturing method of an ultralow-loss large-mode-field optical fiber side pumping beam combiner.
In order to solve the technical problem, the invention provides a manufacturing method of an ultralow-loss large-mode-field optical fiber side pumping beam combiner, which is used for integrating two pumping optical fibers and a large-mode-field signal optical fiber through fused tapering, and comprises the following steps:
s1, removing the coating layer at the corresponding fusion joint part in the large mode field signal fiber and the pump fiber to expose the cladding layers inside the large mode field signal fiber and the pump fiber;
s2, pre-thinning the two pump fibers, and then respectively and tightly attaching the thinned parts to two sides of a bare cladding in the large mode field signal fiber to form a fiber bundle;
s3, then, sintering and heating the cladding region jointed with each optical fiber in the optical fiber bundle;
s4, stretching the optical fiber bundle when the jointed cladding region is heated to a molten state, so that the size of the molten region in the large-mode signal optical fiber is thinned and reduced to form a tapered structure with two symmetrical ends, gradually reducing the sintering temperature after stretching until the optical fiber bundle is completely heated, and enabling the optical fiber bundle to be recovered to room temperature to form a solid state, thereby welding the large-mode signal optical fiber and the pump optical fiber into a whole.
Further, in step S1, after removing the coating layer, the bare cladding layers in the large mode field signal fiber and the pump fiber are cleaned by alcohol wiping.
Further, in step S2, after the claddings of the large mode field signal fiber and the pump fiber are bonded, both ends of the bonded region are fixed with adhesive tape.
Further, the following steps are included between steps S2 and S3:
s21, respectively connecting two ends of the large-mode-field signal fiber into a signal light source and a power meter, wherein a cladding region attached between the large-mode-field signal fiber and the pump fiber is positioned between the signal light source and the power meter; and the two ends of the large mode field signal optical fiber are respectively connected into the two optical fiber mode field adapters, and the optical fiber mode field adapters are communicated with the signal light source and the power meter through single mode optical fibers.
Further, in step S3, the optical fiber bundle is placed on a tapering machine, two symmetrically disposed clamps are used to respectively clamp two ends of the bonding region of the optical fiber bundle, and then oxyhydrogen flame on the tapering machine is used to burn and heat the bonding region, and then the optical fiber bundle is stretched in a manner that the clamps at the two ends of the bonding region respectively slowly move and separate in opposite directions.
Further, in step S4, the bonded clad region is heated to a molten state and then is sintered and heated for 100-500 seconds, and then the optical fiber bundle is slowly drawn.
Further, in step S4, the stretching rate is controlled to 5mm/min and the stretching length is controlled to be within 8 mm.
Further, the following steps are included between steps S1 and S2:
s11, the pump fiber is firstly placed on a tapering machine, and then the cladding exposed in the pump fiber is thinned in a fused tapering mode.
Further, in step S4, after the drawing is finished, the temperature of the sintering is gradually reduced in four stages, and finally the optical fiber bundle is cooled and returned to room temperature; the four stages include:
the first stage is as follows: cooling to 1400 ℃, and heating for 20 s;
and a second stage: cooling to 1000 ℃, and heating for 20 s;
and a third stage: cooling to 500 ℃, and heating for 20 s;
a fourth stage: the heating is directly removed, and the optical fiber bundle is cooled to return to the room temperature.
The ultra-low loss large mode field optical fiber side pumping beam combiner is characterized by being manufactured by the manufacturing method of any one of claims 1 to 9.
The invention has the following beneficial effects:
the optical fiber at the fusion joint part is properly thinned in the optical fiber bundle fusion process, and the micro deformation of a machine, a clamp, gravity and thermal stress factors on the large-mode-field optical fiber is weakened under the action of a stretching force, so that the distortion degree of a base mode signal is reduced as much as possible when the base mode signal passes through the fusion zone, the insertion loss of the base mode signal during the manufacture of a large-mode-field optical fiber device can be effectively controlled, the comprehensive performance of the device is greatly improved, the signal output power and the beam quality of a laser are further improved, the performance, the reliability and the stability of a laser product are improved, and the industrial production efficiency is improved; the two ends of the large-mode-field signal optical fiber are respectively connected into the signal light source and the power meter before the optical fiber bundle is fused, so that the signal loss degree of the large-mode-field optical fiber can be tested, the change condition of the optical fiber signal passing through a fused area can be observed in real time in the fusing and stretching processes, and the quality of fused stretching is ensured; the pump optical fiber and the large-mode-field signal optical fiber are fixed by the adhesive tape after being jointed, so that the pump optical fiber and the large-mode-field signal optical fiber are effectively and tightly jointed together, the relative position between the pump optical fiber and the large-mode-field signal optical fiber is kept stable, the pump optical fiber and the large-mode-field signal optical fiber cannot shift, and the quality of the fused and stretched optical fiber is higher and; the two clamps which are symmetrically arranged are used for respectively clamping two ends of the attaching area in the optical fiber bundle, so that the relative position between the two clamps is further ensured not to move, the optical fiber bundle is stretched in a mode that the two clamps respectively move and separate slowly in opposite directions, the optical fiber bundle is stretched to form a straight line, and the problem that the optical fiber is deformed due to dislocation in the stretching process is solved; in addition, the invention controls the melting heating for 100-500s and then slowly stretches the optical fiber bundle, ensures that the cladding region is integrally molten, and avoids the problem that the surface of the cladding is molten and the center of the cladding is solid due to insufficient melting heating time, so that the optical fiber bundle is broken during stretching.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
FIG. 1 is a schematic diagram of a large mode field signal fiber connected to a monitoring optical path in an embodiment;
FIG. 2 is a schematic view of two symmetrically arranged clamps according to an embodiment;
FIG. 3 is a schematic diagram illustrating an embodiment of attaching a pump fiber to two sides of a large mode field signal fiber;
FIG. 4 is a schematic diagram of the optical fiber bundle after fusion-drawing in the example.
The optical fiber clamp comprises a clamp 1, a clamp 11, a first clamping opening, a clamp 12, a second clamping opening, a pump optical fiber 2 and a large mode field signal optical fiber 3.
Detailed Description
For a fuller understanding of the technical content of the present invention, reference should be made to the following detailed description taken together with the accompanying drawings.
In order to explain the feasibility of the inventive concept, the technical contents, the achieved objects and the effects of the invention are combined for explanation.
Examples
As shown in fig. 3, this embodiment takes the fabrication of an ultra-low loss large mode field fiber side pumping combiner as an example, and illustrates that the large mode field fiber is thinned in the sintering process, so that a combiner with very small fundamental mode loss can be implemented; the optical fiber coupling device specifically comprises two pumping optical fibers 2 and a large mode field signal optical fiber 3, wherein the type of the pumping optical fiber is 105/1250.22 NA, the type of the large mode field signal optical fiber is 25/2500.07/0.46 NA, the pumping optical fiber is required to be attached to the surface of the large mode field signal optical fiber after being thinned, and then the pumping optical fiber and the large mode field signal optical fiber are fused together, so that the pumping optical coupling can be transmitted to the cladding of the large mode field signal optical fiber, and the specific manufacturing process comprises the following steps:
a. preparing an oxyhydrogen flame tapering machine and a clamp corresponding to the optical fiber model, removing an outer coating layer at a corresponding fusion joint part (namely a fusion splicing region, particularly the middle section of the fusion splicing region) in the large mode field signal optical fiber and the pump optical fiber by adopting a thermal stripping method or an etching method, exposing the inner cladding layers of the large mode field signal optical fiber and the pump optical fiber, and cleaning the exposed cladding layer region by adopting an alcohol wiping mode.
b. And respectively placing the two pump fibers in an oxyhydrogen flame tapering machine, and then reducing the outer diameter in the middle of a bare cladding region in the pump fibers to 15-25 mu m in a melting tapering way.
c. The thinned parts of the two pump fibers are respectively and tightly attached to two sides of the periphery of the exposed cladding of the large mode field signal fiber to form a fiber bundle (as shown in figure 3), and the large mode field signal fiber and the pump fibers are fixed together by using gummed paper at two ends of the attached cladding region, so that the problem of displacement of each fiber is avoided.
d. Connecting the large mode field signal optical fiber into a monitoring optical path for monitoring signal change; specifically, two ends of a large-mode-field signal fiber are respectively connected into a signal light source and a power meter, and a cladding region attached between the large-mode-field signal fiber and a pump fiber is positioned between the signal light source and the power meter; optical fiber mode field adapters are arranged between the large mode field signal optical fiber and the signal light source and the power meter, two ends of the large mode field signal optical fiber are respectively connected into the two optical fiber mode field adapters, and the optical fiber mode field adapters are communicated with the signal light source and the power meter through single mode fibers (as shown in figure 1).
e. And then, the oxyhydrogen flame on the oxyhydrogen flame tapering machine is used for carrying out fusion heating on the cladding region jointed with the pumping optical fiber and the large-mode-field signal optical fiber.
In the step e, the two fixtures 1 symmetrically arranged left and right have specific structures as shown in fig. 2, where each fixture 1 includes a first clamping opening 11 (i.e., a slot for placing a large mode field signal fiber) disposed in the middle thereof and horizontally penetrating therethrough, and two second clamping openings (i.e., slots for placing a pump fiber) disposed on two sides of the first clamping opening and obliquely penetrating therethrough, the first clamping opening and the second clamping opening are respectively used for clamping the large mode field signal fiber and the pump fiber, and the inclination of the second clamping opening is inclined from the inner side end of the outer side end phenomenon of the clamping, so as to better cooperate with the pump fiber, so that the pump fiber located between the two fixtures has an arc-shaped structure (as shown in fig. 3), and is better tightly attached to the large mode field signal fiber.
f. Heating the attached cladding region to a molten state, sintering and heating for 100s, slowly stretching the optical fiber bundle through two clamps, so that the size of the molten region in the large-mode signal optical fiber is thinned and reduced to form a tapered structure with two symmetrical ends (as shown in fig. 4), gradually reducing the sintering temperature after stretching is finished until the optical fiber bundle is completely heated, and recovering the optical fiber bundle to room temperature to form an integral solid state, so that the large-mode signal optical fiber and the pump optical fiber are welded into a whole; specifically, when the clamps are stretched, the clamps at the two ends of the bonding area are controlled to slowly move along the radial direction of the large mode field signal optical fiber and towards opposite directions respectively, so that the stretching of the optical fiber bundle is realized.
In the step f, in order to avoid that the quality of the solidified optical fiber is influenced by the too fast temperature reduction of the melting area, the melting temperature is changed by adjusting the hydrogen start and the oxygen output of oxyhydrogen flame, so that the melting temperature is gradually reduced in four stages after the stretching is finished, and finally the optical fiber bundle is gradually cooled and recovered to the room temperature; the four stages include:
the first stage is as follows: cooling to 1400 ℃, and heating for 20 s;
and a second stage: cooling to 1000 ℃, and heating for 20 s;
and a third stage: cooling to 500 ℃, and heating for 20 s;
a fourth stage: and directly removing heating (namely directly closing the output of hydrogen and oxygen and extinguishing oxyhydrogen flame) to gradually cool the optical fiber bundle to return to the room temperature.
In the embodiment, the monitoring data curve of the monitoring light path connected to the large-mode-field signal optical fiber shows that in the whole melting and heating process, the signal loss of the large-mode-field signal optical fiber is basically unchanged, a flat straight line is maintained, the final variation is less than or equal to 0.1db, and the test pumping efficiency can reach more than 95%.
In other embodiments of the present invention, step f is followed by a step of encapsulating the fired exposed cladding region with an outer sealing tube and a heat conducting medium filled in the outer sealing tube.
In other embodiments of the present invention, when the large mode field signal fiber is changed to a polarization maintaining type large mode field fiber, the attenuation is properly performed during the fusion process, and the variation of the extinction ratio of the fundamental mode signal is also small (less than 2 dB); therefore, the method is suitable for polarization-maintaining and non-polarization-maintaining large-mode-field optical fibers.
In other embodiments of the present invention, when the number of the pump fibers fused to the large mode field signal fiber is three or more, the plurality of pump fibers are closely attached to the outer periphery of the large mode field signal fiber in an annular array.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (10)
1. A manufacturing method of an ultralow-loss large-mode-field optical fiber side pumping beam combiner is used for integrating two pumping optical fibers and a large-mode-field signal optical fiber through fusion tapering, and is characterized by comprising the following steps:
s1, removing the coating layer at the corresponding fusion joint part in the large mode field signal fiber and the pump fiber to expose the cladding layers in the signal fiber and the pump fiber;
s2, respectively and tightly attaching the bare cladding of the two pump fibers to two sides of the bare cladding of the large mode field signal fiber to form a fiber bundle;
s3, then, sintering and heating the cladding region jointed with each optical fiber in the optical fiber bundle;
s4, stretching the optical fiber bundle when the jointed cladding region is heated to a molten state, so that the size of the molten region in the large-mode signal optical fiber is thinned and reduced to form a tapered structure with two symmetrical ends, gradually reducing the sintering temperature after stretching until the optical fiber bundle is completely heated, and enabling the optical fiber bundle to be recovered to room temperature to form a solid state, thereby welding the large-mode signal optical fiber and the pump optical fiber into a whole.
2. The method for manufacturing the ultra-low loss large mode field fiber side pump beam combiner of claim 1, wherein in step S1, after removing the coating layer, the bare cladding layers in the signal fiber and the pump fiber are cleaned by alcohol wiping.
3. The method for manufacturing the ultra-low loss large mode field optical fiber side pump beam combiner of claim 1, wherein in step S2, after the claddings of the large mode field signal optical fiber and the pump optical fiber are bonded, the two ends of the bonded region are fixed by gummed paper.
4. The method for manufacturing the ultra-low loss large-mode-field optical fiber side-pumped beam combiner of claim 3, wherein the steps between S2 and S3 further comprise the steps of:
s21, respectively connecting two ends of the large-mode-field signal fiber into a signal light source and a power meter, wherein a cladding region attached between the large-mode-field signal fiber and the pump fiber is positioned between the signal light source and the power meter; and the two ends of the large mode field signal optical fiber are respectively connected into the two optical fiber mode field adapters, and the optical fiber mode field adapters are communicated with the signal light source and the power meter through single mode optical fibers.
5. The method for manufacturing the ultra-low-loss large-mode-field optical fiber side-pumped beam combiner as claimed in claim 1, wherein in step S3, the optical fiber bundle is placed on a tapering machine, two symmetrically arranged clamps are used to clamp two ends of the bonding region of the optical fiber bundle respectively, oxyhydrogen flame on the tapering machine is used to burn and heat the bonding region, and then the optical fiber bundle is stretched in a manner that the clamps at two ends of the bonding region move and separate slowly in opposite directions respectively.
6. The method as claimed in claim 5, wherein in step S4, the fiber bundle is slowly drawn after the attached cladding region is heated to a molten state and the fusion heating is performed for 100S and 500S.
7. The method for fabricating the ultra-low loss large-mode-area fiber side-pumped beam combiner of any one of claims 1 to 6, wherein in step S4, the stretching speed is controlled to be 5mm/min, and the stretching length is controlled to be within 8 mm.
8. The method for manufacturing the ultra-low loss large-mode-field optical fiber side-pumped beam combiner of claim 1, wherein the steps between S1 and S2 further comprise the steps of:
s11, the pump fiber is firstly placed on a tapering machine, and then the cladding exposed in the pump fiber is thinned in a fused tapering mode.
9. The method for manufacturing the ultra-low-loss large-mode-field optical fiber side-pumped beam combiner as claimed in claim 1, wherein in step S4, the temperature of the sintering is gradually reduced in four stages after the stretching is finished, and finally the optical fiber bundle is cooled to return to room temperature; the four stages include:
the first stage is as follows: cooling to 1400 ℃, and heating for 20 s;
and a second stage: cooling to 1000 ℃, and heating for 20 s;
and a third stage: cooling to 500 ℃, and heating for 20 s;
a fourth stage: the heating is directly removed, and the optical fiber bundle is cooled to return to the room temperature.
10. An ultra-low loss large mode field optical fiber side pumping beam combiner, characterized in that it is made by the method of any claim 1-9.
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| CN114325948A (en) * | 2022-01-11 | 2022-04-12 | 四川思创激光科技有限公司 | Manufacturing method of side pumping beam combiner and optical fiber welding method thereof |
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Application publication date: 20200811 |