CN115657211A - Mid-infrared optical fiber combiner based on end-face pumping and manufacturing method thereof - Google Patents
Mid-infrared optical fiber combiner based on end-face pumping and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a mid-infrared band fiber laser beam combiner and a manufacturing method thereof, wherein the fiber beam combiner comprises: the laser beam combining device comprises an input optical fiber, an output optical fiber, a pump optical fiber, a glass sheet and a curing material, wherein the input optical fiber and the output optical fiber are welded in an end face pumping mode, the size of the end face of the pump optical fiber is reduced after the pump optical fiber is tapered, the end face of the pump optical fiber is fixed in a gap of the end faces of the beam combining end optical fibers of the input optical fiber and the output optical fiber, and the optical fibers are fixed by using the curing material with low refractive index, so that high-efficiency laser beam combining for pumping of a middle infrared band is realized with low cost and a simple manufacturing method.
Description
Technical Field
The invention relates to the technical field of optical fiber beam combiners, in particular to an end-pumped mid-infrared optical fiber beam combiner and a manufacturing method thereof.
Background
Due to the specific absorption characteristic, the high-power mid-infrared laser is widely applied to various fields of medicine, national defense, remote sensing and the like. Compared with a solid laser, the medium infrared fiber laser has the advantages of good beam quality, high output power, low cost and the like. The quartz fiber has large loss in the waveband of more than 2.4 mu m, and the fluoride fiber, the chalcogenide fiber, the tellurate fiber and other soft glass fibers have lower phonon energy, so the soft glass fiber is the main light guide material of the current mid-infrared fiber laser. In recent years, with the gradual maturity of the manufacturing process of the soft glass optical fiber, the output power of amplifying the mid-infrared laser (for example, 2.8 μm and 3.1 μm) in the soft glass active optical fiber is remarkably improved based on the main oscillation power optical fiber amplification (MOPA) technology.
At present, the mainstream method for amplifying the mid-infrared laser in the soft glass active optical fiber is to couple the mid-infrared signal light into the soft glass active optical fiber through a lens space, and couple the pump light into the soft glass active optical fiber by using a dichroic mirror for pump amplification; or the intermediate infrared signal light output optical fiber and the soft glass active optical fiber are welded or spatially butted, and then the pump light is coupled to the active optical fiber through the dichroic mirror to perform reverse pumping amplification on the signal light. In the method, spatial devices such as a dichroic mirror and a lens are required to be introduced, so that the problems of large system size, high heat management difficulty, low integration level and the like are caused. More seriously, this method will cause great uncertainty in the pump coupling efficiency, and once the environment is overheated or mechanical vibration occurs, the coupling efficiency of the pump light will change dramatically, which greatly affects the stability of the system. On the other hand, due to OH in air - The diffusion at the output end face of the soft glass active optical fiber can cause the photodegradation of the fluoride optical fiber, and the end face of the soft glass optical fiber is easy to be damaged by the pumping mode under high pumping power, so that an end cap is generally required to be manufactured at the end face of the optical fiber.
The other intermediate infrared laser amplification based on the optical fiber beam combiner can realize full optical fiber and high integration of the system in the true sense, and has the advantages of simple structure, low cost and the like. In the near infrared band, the fused tapering of the quartz fiber is required for the commercial fiber combiner based on the quartz fiber, whether the end-pumping or the side-pumping is adopted. Compared with silica glass or other single crystals, soft glass has lower mechanical strength and lower heat resistance due to lower thermal conductivity, lower melting temperature and easy deliquescence. Therefore, the process requirement of the fusion tapered soft glass optical fiber is high, the manufacturing difficulty of the intermediate infrared optical fiber combiner based on the soft glass optical fiber is high, and no commercial intermediate infrared band combiner exists in the market.
Disclosure of Invention
The invention mainly aims to provide an end-pumped mid-infrared optical fiber combiner and a manufacturing method thereof.
In order to achieve the above object, a first aspect of the present invention provides an end-pumped mid-infrared fiber combiner, including: the optical fiber comprises an input optical fiber, an output optical fiber, a pump optical fiber, a glass sheet and a solidified material, wherein the solidified material has the characteristic of low refractive index, and the pump optical fiber is an optical fiber which is cut in a cone area after being tapered; the input optical fiber and the output optical fiber are welded; the pump optical fiber is positioned on one side of the input optical fiber, and the end face of the taper cut end of the pump optical fiber is attached to the end face of the fusion-spliced end of the output optical fiber; the solidified material is used for fixing the input optical fiber, the output optical fiber and the pump optical fiber on the glass sheet.
Further, the mid-infrared optical fiber combiner based on end-pumping further comprises: the glass sheet is fixedly arranged in the packaging box, the input optical fiber and the pump optical fiber extend out of the packaging box from one through hole, and the output optical fiber extends out of the packaging box from the other through hole.
Furthermore, the input optical fiber is a single-clad soft glass optical fiber, the output optical fiber is a double-clad soft glass optical fiber, the pump optical fiber is a quartz optical fiber, and the diameter of the input optical fiber is smaller than that of the output optical fiber.
Further, the curing material is ultraviolet curing glue with the refractive index of 1.46; the glass sheet is mainly composed of Al 2 O 3 The sapphire glass sheet of (2) and the length is 20mm, the width is 5mm, and the thickness is 0.5mm.
The second aspect of the present invention provides a method for manufacturing a mid-infrared optical fiber combiner based on end-pumping, including: stripping coating layers at one ends of the input optical fiber and the output optical fiber, cleaning bare fibers, and cutting the processed end faces into flat angles by using a cutter; welding the input optical fiber and the output optical fiber after the angle is cut off by using a welding machine; taking a section of pump optical fiber, stripping a section of coating layer on the pump optical fiber, cleaning the bare part of the optical fiber cladding, melting and tapering the optical fiber, and cutting the tapered pump optical fiber into two sections along a tapered region; placing a section of the pump optical fiber, the input optical fiber and the output optical fiber on the same plane after tapering cutting, enabling the end face of the pump optical fiber after tapering to be close to the fusion point of the input optical fiber and the output optical fiber, and aligning the end face gap of the output optical fiber; and fixing the input optical fiber, the pumping optical fiber and the output optical fiber on a glass sheet by using a low-refractive-index curing material to obtain the end-pumping-based mid-infrared optical fiber combiner.
Further, the method further comprises:
fixing the glass sheet in a packaging box, wherein through holes are formed in two opposite sides of the packaging box;
and extending the input optical fiber and the pumping optical fiber out of the packaging box from one through hole, extending the output optical fiber out of the packaging box from the other through hole, and fixing the packaging box to obtain the packaged intermediate infrared optical fiber combiner based on end pumping.
Further, the stripping off the coating layer at one end of the input optical fiber and the output optical fiber and cleaning the bare fiber comprises: soaking one end of the input optical fiber and one end of the output optical fiber for fusion welding by using an organic solvent; stripping the softened input optical fiber and output optical fiber coating layers by using wire stripping pliers; and cleaning the bare fiber with an ultrasonic cleaner or/and high-purity alcohol after the coating layer is stripped, so that the end faces of the input optical fiber and the output optical fiber at the ends for welding have no debris residue.
Further, after stripping a section of coating layer on the pump fiber, cleaning the bare part of the fiber cladding, then performing fusion tapering on the cleaned bare part, and then cutting the tapered pump fiber into two sections along the tapered region, the method comprises the following steps: after a section of coating layer is stripped on the pump optical fiber by using wire stripping pliers, the exposed part of the pump optical fiber coating layer is wiped clean by using high-purity alcohol; putting the pump optical fiber on a tapering machine for fused tapering, and drawing the diameter of the taper waist of the pump optical fiber to a preset size; and cutting the tapered optical fiber into two sections along the tapered region by using a cutting knife, and keeping the end face of one cut end smooth.
Further, the fixing the input, pump and output fibers on a glass sheet using a low refractive index cured material comprises: the low-refractive-index ultraviolet curing glue is dotted near the fusion point of the input optical fiber and the output optical fiber, and the peeling coating point of the output optical fiber is covered; and irradiating the ultraviolet curing glue with low refractive index by using an ultraviolet lamp so as to fix the input optical fiber, the pumping optical fiber and the output optical fiber on the glass sheet after the ultraviolet curing glue is cured.
Further, the manufacturing method further comprises the following steps: welding the non-tapered end of the pump optical fiber with the output end of the pump light source; outputting pump light by using a pump light source, moving the position of the pump optical fiber, and observing the power output of the pump light at the output end of the output optical fiber when the pump optical fiber is positioned at different positions, wherein the highest output power is the optimal position of the pump light source; and taking the optimal position as the position of the pump fiber in the mid-infrared fiber combiner based on end-face pumping.
The invention provides a mid-infrared optical fiber combiner based on an end-face pump and a manufacturing method thereof, and the mid-infrared optical fiber combiner has the beneficial effects that:
the mid-infrared optical fiber combiner based on the end-face pumping has the characteristics of simple structure, high coupling efficiency, high bearing power and the like, and the problem that the mid-infrared band lacks of the optical fiber combiner is solved practically;
the manufacturing method of the end-pumped mid-infrared optical fiber combiner effectively solves the problem of high difficulty in soft glass optical fiber melting and tapering, adopts a simple end-pumped method to combine pumping light and signal light, and is simple to operate and low in cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a device for manufacturing an optical fiber combiner according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a two-dimensional adjusting bracket according to an embodiment of the present invention;
FIG. 3 is a schematic layout diagram of a composite optical fiber of an end-pumped mid-infrared optical fiber combiner according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a cut fused biconical taper pump fiber of an end-pumped mid-infrared fiber combiner according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of fusion splicing of an input fiber and an output fiber of an end-pumped mid-infrared fiber combiner according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a package and a structure of an end-pumped mid-infrared optical fiber combiner according to an embodiment of the present invention;
fig. 7 is a flowchart of a method for manufacturing a mid-infrared optical fiber combiner based on end-pumping according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
When the mid-infrared optical fiber combiner based on end-pumping provided by the present invention is manufactured, the embodiment of the present invention further shows the structure of the manufacturing apparatus of the optical fiber combiner, and for convenience of description, only the part related to the embodiment of the present invention is shown, as shown in fig. 1, the manufacturing apparatus of the optical fiber combiner provided by the present embodiment includes an adjusting frame 1, an adjusting frame 2, and an adjusting frame 3. The adjusting frame 1 and the adjusting frame 2 belong to a three-dimensional adjusting frame, and clamps are arranged on the adjusting frame. The adjusting frame 3 is a two-dimensional adjusting frame, a metal strip is arranged on the adjusting frame, and the specific structure is shown in figure 2. In addition, two high power miniature microscopes connected with a computer for use are selected and respectively placed vertically and horizontally.
In this embodiment, referring to fig. 3, the manufactured mid-infrared optical fiber combiner based on end-pumping includes: an input optical fiber 4, an output optical fiber 5, a pump optical fiber 6, a glass sheet (not shown) and a solidified material (not shown), wherein the solidified material has the characteristic of low refractive index, and the pump optical fiber 6 is an optical fiber cut at a cone region after tapering; the input optical fiber 4 and the output optical fiber 5 are welded; the pumping optical fiber 6 is positioned at one side of the input optical fiber 4, and the end face of the tapering cut end of the pumping optical fiber 6 is attached to the end face of the welding end of the output optical fiber 5; the solidified material is used to fix the input optical fiber 4, the output optical fiber 5 and the pump optical fiber 6 on the glass sheet.
Referring to fig. 4, a schematic structural diagram of cutting a fused biconical taper pump fiber 6 is shown, in which after the pump fiber 6 is tapered, diameters of two ends are unchanged, a taper region in the middle is thinned, a practical cutter 7 is cut into two sections at a proper position, and any one section can be used as the pump fiber 6 in fig. 2.
Referring to fig. 5, which is a schematic structural diagram of the input optical fiber 4 and the output optical fiber 5 during fusion splicing, one end face of the input optical fiber 4 is close to one end face of the output optical fiber 5, and the fire head 8 of the fusion splicer can fuse the input optical fiber 4 and the output optical fiber 5.
Therefore, the mid-infrared optical fiber combiner based on the end-face pumping has the characteristics of simple structure, high coupling efficiency, high bearing power and the like, and the problem that the mid-infrared band lacks an optical fiber combiner is solved practically.
In one embodiment, the end-pumped mid-infrared optical fiber combiner further comprises a packaging box, the specific structure of the packaging box is shown in fig. 6, through holes are formed in two opposite sides of the packaging box, the glass sheets are fixedly arranged in the packaging box, the input optical fiber and the pump optical fiber extend out of the packaging box from one through hole, and the output optical fiber extends out of the packaging box from the other through hole.
In this embodiment, the size of the package box is a metal rectangular box of 40mm × 13mm × 7mm, screw holes are distributed on the upper portion, the lower portion is a through hole design, the glass sheet is located between the upper portion and the lower portion, and after the glass sheet is fixed in the package box, screws are installed in the screw holes to complete the package.
In one embodiment, the input fiber 4 is a single-clad soft glass fiber, the output fiber 5 is a double-clad soft glass fiber, the pump fiber 6 is a silica fiber, and the diameter of the input fiber 4 is smaller than the diameter of the output fiber 5.
In this embodiment, the input fiber 4 can be a single-clad zirconium fluoride fiber with a core/clad size of 6.5/125/250 μm, the output fiber 5 can be a double-clad ZBLAN fiber with a core/clad size of 14/250/400 μm, and the pump fiber 6 can be a multimode silica fiber with a core/clad size of 105/125/250 μm; in other embodiments, other optical fibers can be used that satisfy the embodiments of the present application.
In one embodiment, the cured material is a uv-curable glue with a refractive index of 1.46; glass flakes containing Al as the main component 2 O 3 The sapphire glass sheet of (2) and the length is 20mm, the width is 5mm, and the thickness is 0.5mm.
In this embodiment, a uv curable adhesive having a refractive index of 1.46, which is a transparent, colorless liquid photopolymer curable under uv irradiation, is used as the curing material. It has an extremely fast curing speed, has excellent light transmittance, low shrinkage and slight elasticity, and can ensure long-term characteristics when environmental conditions change. The glass sheet is a rectangular sapphire glass sheet and comprises the main components ofAl 2 O 3 The specification is 20mm in length, 5mm in width and 0.5mm in thickness. The light transmission range of the glass sheet is from near ultraviolet to middle and far infrared, and leaked light can be guided out when the beam combiner works, so that the heat load of a device is reduced. In addition, it has the characteristics of high hardness, pressure resistance, corrosion resistance and high temperature resistance.
Referring to fig. 7, an embodiment of the present invention further provides a method for manufacturing a mid-infrared optical fiber combiner based on end-pumping, including:
s1, stripping coating layers at one ends of an input optical fiber and an output optical fiber, cleaning bare fibers, and cutting the processed end faces into straight angles by using a cutter;
s2, welding the input optical fiber and the output optical fiber after the angle is cut off by using a welding machine;
s3, taking a section of pump optical fiber, stripping a section of coating layer on the pump optical fiber, cleaning the bare part of the optical fiber cladding, performing fusion tapering on the optical fiber cladding, and cutting the tapered pump optical fiber into two sections along a tapered region;
s4, placing the section of the pump optical fiber, the input optical fiber and the output optical fiber on the same plane after tapering cutting, enabling the end face of the pump optical fiber after tapering to be close to the fusion point of the input optical fiber and the output optical fiber, and aligning the end face gap of the output optical fiber;
and S5, fixing the input optical fiber, the pump optical fiber and the output optical fiber on a glass sheet by using a low-refractive-index curing material to obtain the end-pumped-based mid-infrared optical fiber combiner.
The end-pumping-based mid-infrared optical fiber combiner is manufactured through the embodiment, the problem that the difficulty of soft glass optical fiber fusion tapering is high is effectively solved, pumping light and signal light are combined by adopting a simple end-pumping method, and the end-pumping-based mid-infrared optical fiber combiner is simple to operate and low in cost.
In one embodiment, the step S1 of stripping off the coating layer at one end of the input optical fiber and the output optical fiber, and cleaning the bare fiber specifically includes: soaking one end of the input optical fiber and one end of the output optical fiber for fusion welding by using an organic solvent; stripping the softened input optical fiber and output optical fiber coating layers by using wire stripping pliers; and cleaning the bare fiber with an ultrasonic cleaner or/and high-purity alcohol after the coating layer is stripped so as to ensure that the end faces of the input optical fiber and the output optical fiber at the ends for fusion splicing have no debris residue.
Wherein, when the end of the input optical fiber and the end of the output optical fiber for fusion splicing are soaked by the organic solvent, the end of the input optical fiber and the end of the output optical fiber are soaked in the dichloromethane solvent for 1 to 2 minutes, and the soaking length is about 1.5cm.
When the coating layer of the soaked part is stripped by using wire stripping pliers, the stripping point needs to be kept flat and smooth in the stripping process. The bare fiber is wiped by using high-purity alcohol, so that not only can no debris be left on the surface of the bare fiber, but also no excessive alcohol is left. If necessary, the cleaved fiber end face can be placed in an ultrasonic cleaner for vibration cleaning to ensure that the end face is free of debris.
In one embodiment, in step S2, the input optical fiber and the output optical fiber after the angle is cut off are fusion-spliced by using a fusion splicer, in the process of performing, special parameter setting is required to be performed on the fusion splicer, the cores of the input optical fiber and the output optical fiber are aligned before fusion splicing, then parameters such as appropriate discharging time, discharging power and propelling distance are set, and the fusion splicing effect needs to ensure that the fusion splicing point is sufficiently firm. Fig. 5 is a schematic diagram of fusion splicing of an input optical fiber and an output optical fiber.
In one embodiment, when the pump fiber is tapered in step S3, the steps specifically include: after a section of coating layer is stripped on the pump optical fiber by using wire stripping pliers, the exposed part of the pump optical fiber coating layer is wiped clean by using high-purity alcohol; putting the pump optical fiber on a tapering machine for fused tapering, and tapering the diameter of the taper waist of the pump optical fiber to a preset size; and cutting the tapered optical fiber into two sections along the tapered region by using a cutting knife, and keeping the end face of one cut end smooth.
In this embodiment, multimode silica fibers with 105/125/250 μm core/cladding dimensions can be used as the pump fibers. Taking a 1m pump optical fiber, stripping a coating layer with the length of about 3cm at the middle position of the optical fiber by using a wire stripper, wiping the bare part of the optical fiber coating layer clean by using high-purity alcohol, putting the optical fiber coating layer into a tapering machine for fusion tapering, setting a program to draw the diameter of the taper waist of the optical fiber to about 45 mu m, stopping the fusion tapering, cutting the tapered pump optical fiber along the taper waist position by using a cutter, and cutting the end face into a flat angle. A cleaved tapered pump fiber is shown in fig. 4. The cleaving process needs to ensure that the tapered region of the pump fiber is not contaminated.
In one embodiment, step S4 is to adjust the position of the pump fiber, locate the pump fiber at one side of the input fiber, and attach the end face of the tapered cut end of the pump fiber to the end face of the fused end of the output fiber; when the adjusting device is used for adjusting, the welded soft glass input optical fiber and output optical fiber are fixed on two adjusting frames which are placed face to face, the output optical fiber is fixed on the adjusting frames by using a clamp, and the input optical fiber is lightly lapped on the adjusting frames which are provided with the clamp. And adhering the tapered pump optical fiber to a clamp of an adjusting frame for placing the input optical fiber, and then adjusting a knob of the adjusting frame to enable the pump optical fiber to be close to a welding point of the input optical fiber and the output optical fiber. And observing the relative positions of the three optical fibers at the welding point by using two microscopes which are respectively horizontally and vertically arranged, and continuously adjusting the position of the pumping optical fiber to enable the pumping optical fiber to be close to the input optical fiber on the horizontal plane, wherein the end face of the pumping optical fiber is tightly attached to the end face of the output optical fiber. The position arrangement of the pump, input and output fibres is shown in particular in figure 3.
In this embodiment, the method for manufacturing an end-pumped mid-infrared optical fiber combiner further includes: welding the non-tapered end of the pump optical fiber with the output end of the pump light source; outputting pump light by using a pump light source, moving the position of the pump optical fiber, and observing the power output of the pump light at the output end of the output optical fiber when the pump optical fiber is positioned at different positions, wherein the highest output power is the optimal position of the pump light source; the optimal position is used as the position of the pump fiber in the mid-infrared fiber combiner based on end-face pumping.
In order to find the optimal position of the pump optical fiber and realize the optimal coupling efficiency, the non-tapered end of the pump optical fiber is welded with the output end of the pump light source, the pump light power output of the output end of the output optical fiber is output when the pump optical fiber is observed to be positioned at different positions, and the highest output power is the optimal position.
In one embodiment, the step S5 of fixing the input optical fiber, the pump optical fiber and the output optical fiber on the glass sheet using the low refractive index cured material includes: the low-refractive-index ultraviolet curing glue is dotted near the fusion point of the input optical fiber and the output optical fiber, and the peeling coating point of the output optical fiber is covered; and irradiating the ultraviolet curing glue with low refractive index by using an ultraviolet lamp so as to fix the input optical fiber, the pumping optical fiber and the output optical fiber on the glass sheet after the ultraviolet curing glue is cured.
The low refractive index curing material used in this example is an ultraviolet curing glue with a refractive index of 1.46, which is a transparent, colorless liquid photopolymer that can be cured under ultraviolet light irradiation. It has an extremely fast curing speed, has excellent light transmittance, low shrinkage and slight elasticity, and can ensure long-term characteristics when environmental conditions change.
The glass sheet used in this example was a rectangular sapphire glass sheet, the main component of which was Al2O3, and the specification was 20mm in length, 5mm in width and 0.5mm in thickness. The light transmission range of the glass sheet is from near ultraviolet to middle and far infrared, and leaked light can be guided out when the beam combiner works, so that the heat load of a device is reduced. In addition, it has the characteristics of high hardness, pressure resistance, corrosion resistance and high temperature resistance.
Specifically, when the input optical fiber, the pump optical fiber and the output optical fiber are fixed on the glass sheet, the sapphire sheet is placed on the metal strip of the adjusting frame shown in fig. 2, and the adjusting frame knob is adjusted to adjust the position of the sapphire sheet to be about 1mm under the fusion point of the input optical fiber and the output optical fiber.
And (3) placing the low-refractive-index ultraviolet curing glue near the fusion point of the input optical fiber and the output optical fiber, covering the stripping and coating point of the output optical fiber, and then irradiating and curing by using an ultraviolet lamp. The ultraviolet curing glue with high refractive index is covered on the output optical fiber coating layer to lead out the pump light leaked into the coating layer, so that the beam combiner can bear higher pump power.
In one embodiment, the method for manufacturing the end-pumped mid-infrared fiber combiner further comprises the following steps: fixing the glass sheet in a packaging box, wherein through holes are formed in two opposite sides of the packaging box; and extending the input optical fiber and the pumping optical fiber out of the packaging box from one through hole, extending the output optical fiber out of the packaging box from the other through hole, and fixing the packaging box to obtain the packaged intermediate infrared optical fiber combiner based on the end-face pumping.
The structural design of the packaging box can refer to fig. 6, which is a metal rectangular box with the size of 40mm × 13mm × 7mm, the upper part is distributed with screw holes, and the lower part is a through hole design.
When packaging is carried out, the sapphire sheet fixed with the optical fiber structure is placed in the center of the metal packaging box, the input optical fiber and the pump optical fiber extend out from one end of the through hole of the metal packaging box, and the output optical fiber extends out from the other end of the through hole. And (3) dripping high-refractive-index ultraviolet glue between the sapphire sheet and the packaging box and solidifying the glue, fixing the sapphire sheet bearing the core optical fiber structure in the packaging box, and installing screws in screw holes to finish packaging.
It should be noted that, for the sake of simplicity, the above-mentioned method embodiments are described as a series of acts or combinations, but those skilled in the art should understand that the present invention is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no acts or modules are necessarily required of the invention.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In view of the above description of the end-pumped mid-infrared fiber combiner and the manufacturing method thereof, those skilled in the art will be able to change the concept of the embodiments of the present invention in the following embodiments and application ranges.
Claims (10)
1. An end-pumped mid-infrared fiber combiner, comprising:
the optical fiber comprises an input optical fiber, an output optical fiber, a pump optical fiber, a glass sheet and a solidified material, wherein the solidified material has the characteristic of low refractive index, and the pump optical fiber is an optical fiber which is cut off in a cone area after being tapered;
the input optical fiber and the output optical fiber are welded;
the pumping optical fiber is positioned on one side of the input optical fiber, and the end face of the tapering cut end of the pumping optical fiber is attached to the end face of the welding end of the output optical fiber;
the solidified material is used for fixing the input optical fiber, the output optical fiber and the pump optical fiber on the glass sheet.
2. The mid-infrared fiber combiner based on end-pumping according to claim 1,
the mid-infrared optical fiber beam combiner based on end-pumping further comprises:
the optical fiber pump comprises a packaging box, through holes are formed in two opposite sides of the packaging box, a glass sheet is fixedly arranged in the packaging box, an input optical fiber and a pump optical fiber extend out of one through hole from inside, and an output optical fiber extends out of the other through hole from inside to outside.
3. The mid-infrared fiber combiner based on end-pumping according to claim 1,
the input optical fiber is a single-clad soft glass optical fiber, the output optical fiber is a double-clad soft glass optical fiber, the pump optical fiber is a quartz optical fiber, and the diameter of the input optical fiber is smaller than that of the output optical fiber.
4. The mid-infrared fiber combiner based on end-pumping according to claim 2,
the curing material is ultraviolet curing glue with the refractive index of 1.46;
the glass sheet is mainly composed of Al 2 O 3 The sapphire glass sheet of (2) and the length is 20mm, the width is 5mm, and the thickness is 0.5mm.
5. A method for manufacturing a mid-infrared optical fiber beam combiner based on end-pumping is characterized by comprising the following steps:
stripping coating layers at one ends of the input optical fiber and the output optical fiber, cleaning bare fibers, and cutting the processed end faces into straight angles by using a cutter;
welding the input optical fiber and the output optical fiber after the angle is cut off by using a welding machine;
taking a section of pump optical fiber, stripping a section of coating layer on the pump optical fiber, cleaning the bare part of the cladding layer of the optical fiber, melting and tapering the bare part of the cladding layer of the optical fiber, and cutting the tapered pump optical fiber into two sections along a tapered region;
placing a section of the pump optical fiber, the input optical fiber and the output optical fiber on the same plane after tapering cutting, enabling the end face of the pump optical fiber after tapering to be close to the fusion point of the input optical fiber and the output optical fiber, and aligning the end face gap of the output optical fiber;
and fixing the input optical fiber, the pumping optical fiber and the output optical fiber on a glass sheet by using a low-refractive-index curing material to obtain the end-pumping-based mid-infrared optical fiber combiner.
6. The method for manufacturing an end-pumped mid-infrared fiber combiner according to claim 5, further comprising:
fixing the glass sheet in a packaging box, wherein through holes are formed in two opposite sides of the packaging box;
and extending the input optical fiber and the pumping optical fiber out of the packaging box from one through hole, extending the output optical fiber out of the packaging box from the other through hole, and fixing the packaging box to obtain the packaged intermediate infrared optical fiber combiner based on end pumping.
7. The method for manufacturing an end-pumped mid-infrared fiber combiner according to claim 5,
the step of stripping off the coating layers at one ends of the input optical fiber and the output optical fiber and cleaning the bare fiber comprises the following steps:
soaking one end of the input optical fiber and one end of the output optical fiber for fusion welding by using an organic solvent;
stripping the softened input optical fiber and output optical fiber coating layers by using wire stripping pliers;
and cleaning the bare fiber with an ultrasonic cleaner or/and high-purity alcohol after the coating layer is stripped, so that the end faces of the input optical fiber and the output optical fiber at the ends for welding have no debris residue.
8. The method for manufacturing an end-pumped mid-infrared fiber combiner according to claim 5,
after a section of coating layer is stripped on the pump optical fiber, the exposed part of the optical fiber coating layer is cleaned, then the optical fiber coating layer is fused and tapered, and then the tapered pump optical fiber is cut into two sections along the tapered area, wherein the two sections comprise:
after a section of coating layer is stripped on the pump optical fiber by using wire stripping pliers, the exposed part of the pump optical fiber coating layer is wiped clean by using high-purity alcohol;
putting the pump optical fiber on a tapering machine for fused tapering, and drawing the diameter of the taper waist of the pump optical fiber to a preset size;
and cutting the tapered optical fiber into two sections along the tapered region by using a cutting knife, and keeping the end face of one cut end smooth.
9. The method for manufacturing an end-pumped mid-infrared fiber combiner according to claim 5, wherein the fixing the input fiber, the pump fiber and the output fiber on the glass sheet by using the low refractive index cured material comprises:
the low-refractive-index ultraviolet curing glue is dotted near the fusion point of the input optical fiber and the output optical fiber, and the peeling coating point of the output optical fiber is covered;
and irradiating the ultraviolet curing glue with low refractive index by using an ultraviolet lamp so as to fix the input optical fiber, the pumping optical fiber and the output optical fiber on the glass sheet after the ultraviolet curing glue is cured.
10. The method for manufacturing an end-pumped mid-infrared fiber combiner according to claim 5, further comprising:
welding the non-tapered end of the pump optical fiber with the output end of the pump light source;
outputting pump light by using a pump light source, moving the position of the pump optical fiber, and observing the pump light power output of the output end of the output optical fiber when the pump optical fiber is positioned at different positions, wherein the highest output power is the optimal position of the pump light source;
and taking the optimal position as the position of the pump fiber in the mid-infrared fiber combiner based on end-face pumping.
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