CN113866892B - Laser fiber coupler and manufacturing method thereof - Google Patents
Laser fiber coupler and manufacturing method thereof Download PDFInfo
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- CN113866892B CN113866892B CN202111093975.XA CN202111093975A CN113866892B CN 113866892 B CN113866892 B CN 113866892B CN 202111093975 A CN202111093975 A CN 202111093975A CN 113866892 B CN113866892 B CN 113866892B
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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
- G02B6/26—Optical coupling means
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Abstract
The invention provides a laser fiber coupler and a manufacturing method thereof, wherein the laser fiber coupler comprises: the output assembly comprises a plurality of input optical fibers, wherein an output member is formed at one end of each input optical fiber of the output assembly, and laser signals transmitted by the plurality of input optical fibers are output through the output members; the receiving assembly is provided with a receiving optical fiber penetrating through the receiving assembly, one end of the receiving optical fiber forms a receiving member, the receiving member is arranged opposite to the output member, and the receiving assembly receives the laser signal through the receiving member; a securing assembly for securing and axially aligning the output member and the receiving member, the securing assembly being located radially outward of the output assembly and the receiving assembly. According to the laser fiber coupler provided by the invention, the size of the fiber core of the fiber is kept unchanged, and the multi-path beam shaping is performed through the physical beam shrinking of laser and the double-reflection fiber microstructure, so that the beam quality is improved.
Description
Technical Field
The invention relates to the technical field of laser synthesis, in particular to a laser fiber coupler and a manufacturing method thereof.
Background
The development process of the laser synthesis technology is almost synchronous with the development of the laser technology, and the laser synthesis technology can be applied to the existing different generation system laser products. In recent years, research in key fields of unit laser performance, beam shaping, beam coupling and the like is subjected to breakthrough progress, and the laser synthesis technology is continuously pushed to climb one new peak after another. The laser time sequence synthesis technology is an effective approach of the laser synthesis technology, the application products of the laser time sequence synthesis technology in the feasibility of fiber laser synthesis are less, the technical program system is complex, and how to miniaturize the laser time sequence synthesis technology still needs to be explored.
The mode field diameter is a parameter for measuring the effective transmission range of a laser signal in an optical fiber, and the larger the mode field diameter of the optical fiber is, the higher the laser coupling efficiency is. The improvement of the coupling efficiency of the optical fiber beam can be achieved by changing the mode field diameter of the optical fiber and the convergence of the optical fiber beam. The fiber mode field diameter is changed to perform fusion beam expansion on the fiber, the deformation of the fiber core of the fiber is usually performed, and the laser coupling efficiency is improved. The optical fiber beam converging mode is to perform micro-machining on the tail end of the optical fiber, which is equivalent to beam shaping on the tail end of the optical fiber.
In the prior art, a polarization time sequence synthesis technology and a spectrum synthesis technology are combined in a composite laser beam pulse time sequence synthesis device, so that the problem of crosstalk of grating spectrum synthesis is solved. But the space coupling is adopted to build the system, so that the light beam coupling efficiency is low, and the whole system is not beneficial to engineering.
Disclosure of Invention
The embodiment of the invention provides a laser fiber coupler and a manufacturing method thereof, which are used for improving the average power and the repetition frequency of single-beam fiber laser synthesis output and improving the beam quality of single-beam fiber laser synthesis output laser.
The laser fiber coupler provided by the embodiment of the invention comprises the following components:
the input assembly comprises a plurality of input optical fibers, an input member is formed at one end of each input optical fiber, and laser signals transmitted by the plurality of input optical fibers are output through the input members;
the receiving assembly is provided with a receiving optical fiber penetrating through the receiving assembly, one end of the receiving optical fiber forms a receiving member, the receiving member is arranged opposite to the input member, and the receiving assembly receives the laser signal through the receiving member;
a securing assembly for securing and axially aligning the input member and the receiving member, the securing assembly being located radially outward of the input assembly and the receiving assembly.
According to the laser fiber coupler provided by the embodiment of the invention, the size of the fiber core of the optical fiber is kept unchanged, the multi-path beam shaping is performed through the physical beam shrinking and double-reflection optical fiber microstructure of the laser, the multi-path pulse laser is efficiently coupled, the output average power and the repetition frequency of the single-beam optical fiber laser synthesis are effectively improved, and the beam quality is improved.
According to some embodiments of the invention, the input member is an outer conical structure.
In some embodiments of the invention, the receiving member is of an inner conical cylindrical structure.
According to some embodiments of the invention, the inner tapered bottom surface of the receiving member has a receiving plane perpendicular to the optical fiber transmission direction, the receiving plane receives the laser signals emitted from the input optical fibers located at the radial center position among the plurality of input optical fibers, the annular region of the bottom surface of the receiving member receives the laser signals of the other input optical fibers except the input optical fibers located at the radial center position among the plurality of input optical fibers, and the inner surface of the receiving member is coated with a surface coating film in a region except the receiving plane and the outer surface in a region except the annular region, so that the laser signals received by the annular region are transmitted in a total reflection form within the receiving member.
In some embodiments of the invention, the outer surface inner taper angle of the receiving member is less than or equal to 90 degrees and the inner surface inner taper angle of the receiving member is less than or equal to 90 degrees.
According to some embodiments of the invention, the outer surface of the cross section of the fixing component is polygonal and the inner surface is circular.
In some embodiments of the present invention, the fixing assembly includes an alignment member provided at a middle portion of the fixing assembly in an axial direction and fixing members provided at both end portions of the fixing assembly in the axial direction.
According to some embodiments of the invention, the alignment member is cylindrical and the fixing member is conical cylindrical.
In some embodiments of the invention, the laser fiber coupler further comprises a package assembly located radially outward of the securing assembly.
The manufacturing method of the laser fiber coupler provided by the embodiment of the invention is used for manufacturing the laser fiber coupler provided by some embodiments of the invention, and comprises the following steps:
fusion core expansion is carried out on a plurality of input optical fibers, fusion tapering is applied to the input optical fibers of the fusion core expansion, one end of each input optical fiber is cut according to a preset angle, and the cut end face of each input optical fiber is etched to form an outer cone-shaped structure;
carrying out fusion core expansion on one end of the receiving optical fiber, cutting at the position with the maximum diameter of the core of the receiving optical fiber core expansion, and forming an inner cone-shaped structure on the cut end face of the receiving optical fiber by etching;
forming the fixing component with a bidirectional cone region structure by melt tapering a capillary quartz glass tube with a polygonal outer surface and a circular cross section inner surface;
axially aligning and securing the input member and the receiving member by the securing assembly;
the fixing component is installed in the packaging component, and the gap between the fixing component and the contact position of the packaging component is filled with ultraviolet epoxy resin glue.
The manufacturing method of the laser fiber coupler of the embodiment of the invention obtains the laser fiber coupler which is beneficial to laser beam combination output and improves output average power and repetition frequency with a simple manufacturing method, and simultaneously, the step of designing with an optimized space structure is beneficial to realizing miniaturization of the fiber laser based on the laser time sequence synthesis technology and improves the practicability of the fiber laser based on the laser time sequence synthesis technology.
Drawings
FIG. 1 is a schematic diagram of a laser fiber coupler according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an input assembly of a laser fiber coupler according to an embodiment of the present invention;
FIG. 3 is a side view of an input fiber and input member of a laser fiber coupler according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a receiving assembly of a laser fiber coupler according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the structure of the receiving assembly of the laser fiber coupler after the completion of the fusion core expansion in step S200 according to the embodiment of the present invention;
FIG. 6 is a side view of a receiving member of a laser fiber coupler according to an embodiment of the present invention;
FIG. 7 is a schematic structural view of a fixing assembly of a laser fiber coupler according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view of a securing assembly of a laser fiber coupler according to an embodiment of the present invention;
FIG. 9 is a schematic alignment diagram of the input and receiving components of a laser fiber coupler according to an embodiment of the present invention;
FIG. 10 is a schematic structural view of a fixing member of a laser fiber coupler according to an embodiment of the present invention;
fig. 11 is a schematic view of another form of structure of a fixing member of a laser fiber coupler according to an embodiment of the present invention.
FIG. 12 is a flow chart of a method for fabricating a laser fiber coupler with a protective member according to an embodiment of the present invention;
reference numerals:
The input assembly 1, the input fiber 11, the input member 12, the laser signal a,
a receiving assembly 2 for receiving an optical fiber 21, a receiving member 22, a receiving plane 23, a core-expanding core 24, an annular region 25,
The package assembly 4 is packaged in a package,
the coating layer 5 is applied to the substrate,
and a cladding 6.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description of the present invention is given with reference to the accompanying drawings and preferred embodiments.
In the related technology of the laser coupler applying the time sequence synthesis technology, the laser time sequence synthesis technology is an effective way of the laser synthesis technology, the application products of the laser time sequence synthesis technology in the feasibility of fiber laser synthesis are less, the technical program system is complex, and the problem of how to miniaturize and engineer the laser time sequence synthesis technology is still solved.
The present invention aims to solve the above technical problems to a certain extent, and proposes a laser fiber coupler 100 and a manufacturing method thereof, so as to improve the average output power and the repetition frequency of single-beam fiber laser synthesis and improve the beam quality.
As shown in fig. 1 to 8, a laser fiber coupler 100 according to an embodiment of the present invention includes: an input assembly 1, a receiving assembly 2 and a fixing assembly 3. The input assembly 1 comprises a plurality of input optical fibers 11, an input member 12 is formed at one end of each input optical fiber 11 in the input assembly 1, laser signals A transmitted by the plurality of input optical fibers 11 are output through the input member 12, a receiving optical fiber 21 penetrating through the receiving assembly 2 is arranged at the axis of the receiving assembly 2, a receiving member 22 is formed at one end of the receiving optical fiber 21, the receiving member 22 is arranged opposite to the input member 12, the receiving assembly 2 receives the laser signals A through the receiving member 22, a fixing assembly 3 is used for fixing and axially aligning the input member 12 and the receiving member 22, and the fixing assembly 3 is located on the radial outer side of the input assembly 1 and the receiving assembly 2.
According to the laser fiber coupler 100 provided by the embodiment of the invention, the fiber core size is kept unchanged, the multi-path beam shaping is performed through the physical beam shrinking and double-reflection fiber microstructure of laser, the multi-path pulse laser is efficiently coupled, the single-beam fiber laser synthesis output average power and the repetition frequency are effectively improved, and the beam quality is improved.
As shown in fig. 4 and 5, in some embodiments of the present invention, the receiving member 22 is an inner tapered cylindrical structure by which an integrated double-reflecting optical fiber microstructure is formed.
According to some embodiments of the present invention, the input member 12 is an outer cone structure, and the outer cone structure mainly corresponds to the inner cone cylindrical structure, and the laser beam shrinking coupling is performed through the outer cone structure and the inner cone cylindrical structure corresponding to the cone signal optical fiber beam combining structure, so that the signal laser space coupling efficiency can be effectively improved, and the full superposition coupling of power and frequency is facilitated.
As shown in fig. 2, 3 and 6, according to some embodiments of the present invention, the inner tapered bottom surface of the receiving member 22 has a receiving plane 23 perpendicular to the optical fiber transmission direction, the receiving plane 23 receives the laser signals a emitted from the input optical fibers 11 located at the radial center position among the plurality of input optical fibers, the annular region 25 of the bottom surface of the receiving member 22 receives the laser signals a of the other input optical fibers 11 except the input optical fibers 11 located at the radial center position among the plurality of input optical fibers 11, the inner surface and the outer surface of the receiving member 22 are surface-coated in the region except the receiving plane 23, so that the laser signals a received by the annular region 25 are transmitted in a total reflection form within the receiving member 22.
Specifically, the receiving plane 23 is used for transmitting the laser signal a output by the central input optical fiber 11 after the beam-combining structure of the outer cone-shaped signal optical fiber is contracted, and the laser signals a output by the other input optical fibers 11 are received through the annular region 25 and then transmitted in the receiving member 22 in a total reflection mode.
As shown in FIGS. 4 and 5, in some embodiments of the present invention, the inner taper angle of the outer surface of the receiving member 22 is less than or equal to 90 degrees, and the inner taper angle of the inner surface of the receiving member 22 is more than or equal to 90 degrees, and the inner taper angle and the outer taper angle are designed to satisfy that the laser forms total reflection on the inner and outer surfaces of the inner taper structure, so as to reduce the end-face laser coupling loss as much as possible.
As shown in fig. 7 and 8, according to some embodiments of the present invention, the outer surface of the cross section of the fixing component 3 is a polygon, and the inner surface is a circle, and since the input optical fibers 11 of the input component 1 are arranged to have a cross-sectional shape similar to a polygon, the fixing component 3 with the polygonal outer surface corresponding to the number of sides can accurately align and fix two structural groups by using a microscope.
It should be noted that, by fixing the assembly 3, as shown in fig. 9 (the fixing assembly 3 is not shown), the input member 12 of the input assembly 1 and the receiving member 22 of the receiving assembly 2 may be aligned, so as to achieve more precise laser coupling.
As shown in fig. 7 and 8, in some embodiments of the present invention, the fixing assembly 3 includes an alignment member 31 and a fixing member 32 in an axial direction, the alignment member 31 being provided at a middle portion of the fixing assembly 3 in the axial direction, the fixing member 32 being located at both end portions of the fixing assembly 3 in the axial direction.
As shown in fig. 7 and 8, according to some embodiments of the present invention, the alignment member 31 is cylindrical, and the fixing member 32 is conical cylinder, and by the cylindrical shape, the conical cylinder can naturally fix both structures and form a protective structure by deformation of the conical region.
As shown in fig. 10 and 11, in some embodiments of the present invention, the laser fiber coupler further includes a package assembly 4, the package assembly 4 being located radially outward of the fixing assembly 3. It should be noted that, as shown in fig. 10, the package assembly 4 having the same height as the inner groove may be used, or as shown in fig. 5, the package assembly 4 having the step in the inner groove may be used, and the outer shape of the protection assembly may be better attached by the step, so as to perform a better fixing and packaging function.
The method for manufacturing the laser fiber coupler according to the embodiments of the present invention is characterized in that the method for manufacturing the laser fiber coupler 100 according to some embodiments of the present invention, as shown in fig. 12, includes:
s100: and (3) carrying out fusion core expansion on a plurality of input optical fibers, then applying fusion tapering to the input optical fibers of the fusion core expansion, cutting one end of each input optical fiber according to a preset angle, and forming an outer taper structure on the cut end face of each input optical fiber by etching.
S200: and carrying out fusion core expansion on one end of the receiving optical fiber, cutting at the position with the maximum diameter of the core of the receiving optical fiber core expansion, and forming an inner cone-shaped structure on the cut end face of the receiving optical fiber by etching.
S300: and (3) forming the fixing component with the bidirectional cone region structure by melt tapering the capillary quartz glass tube with the polygonal outer surface and the circular cross section inner surface.
S400: axially aligning and securing the input member and the receiving member by a securing assembly;
s500: the fixture assembly is assembled into the package assembly and the gap between the locations where the fixture assembly and the package assembly contact is filled with ultraviolet epoxy glue.
The manufacturing method of the laser fiber coupler of the embodiment of the invention obtains the laser fiber coupler 100 which is beneficial to laser beam combination output and improves output average power and repetition frequency with a simple manufacturing method, and simultaneously, the step of designing with an optimized space structure is beneficial to realizing miniaturization of the fiber laser based on the laser time sequence synthesis technology and improving the practicability of the fiber laser of the laser time sequence synthesis technology.
In order to further describe the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description of the present invention is given with reference to the accompanying drawings and the specific embodiments.
As shown in fig. 1 to 8, the present invention proposes a laser fiber coupler 100, which is advantageous for laser timing synthesis and sequential superposition to change power and frequency, and is also advantageous for engineering process of laser timing synthesis technology. The specific scheme is as follows: a laser fiber coupler 100 comprising: the optical module comprises an outer cone-shaped signal optical fiber beam combining structure (namely the input assembly 1), an inner cone-shaped core-expanding optical fiber structure (namely the receiving assembly), a multi-dimensional adjustable alignment fixing structure (namely the fixing assembly 3) and an optical module packaging structure (namely the packaging assembly 4). The method is characterized in that: the outer cone-shaped signal optical fiber beam combining structure is formed by micro-machining N double-cladding signal optical fibers by expanding cores, melting and cutting fiber cores; the inner conical core-expanding optical fiber structure is formed by performing fusion core expansion on a single passive double-cladding signal optical fiber, cutting and conical shaping on the end face of a core of the core-expanding optical fiber; the multidimensional adjustable alignment fixing structure is used for precisely aligning and fixing the spatial coupling of the outer cone-shaped signal optical fiber beam combining structure and the inner cone-shaped core-expanding optical fiber structure; the optical module packaging structure protects the whole optical module structure outside the multi-dimensional adjustable alignment fixing structure.
As shown in fig. 2 and 3, the outer taper signal fiber bundle structure is formed by respectively performing fusion core expansion, group Shu Rongrong tapering cutting and micro-machining on each core taper structure of the fiber bundle waist end face by a plurality of signal fibers (namely, the input fibers 11), and the diameters of the fiber cores of the plurality of signal fibers are as follows: the outer cone-shaped signal optical fiber beam combining structure is formed by 10um-30um, the fiber cores of a plurality of signal optical fibers are fused and expanded, and then the fiber beam group Shu Rongrong is tapered, and the fiber cores of the signal optical fibers in the center are not deformed in the fused and tapered process by the expanding and shrinking process method, so that the signal laser transmission insertion loss is reduced. After fusion tapering, cutting the waist beam position of the taper region of the optical fiber bundle, wherein the cutting angle is set to be 0 degrees. And after the cutting is finished, performing micro-machining on the N fiber core end faces in the fiber bundle waist end faces by using a femtosecond laser etching technology to form an outer cone-shaped group structure (namely the input component 12). The core is micro-machined into an outer cone-shaped structure which is mainly corresponding to the inner cone-shaped expanded core optical fiber structure, laser beam shrinking coupling is carried out on the core through a cone group corresponding to the cone-shaped signal optical fiber beam combination structure, the space coupling efficiency of the signal laser can be effectively improved, and full superposition coupling of power and frequency is facilitated.
As shown in fig. 4 and 5, the internal taper core-expanding optical fiber structure is formed by irradiating 1 large-core-diameter signal optical fiber (i.e., the receiving optical fiber 21) with long-band laser for a long time, melting and expanding the core of the signal optical fiber, and then cutting at the position with the largest diameter of the core-expanding optical fiber 24, wherein the diameter of the core-expanding optical fiber 24 is increased, and the mode field diameter is increased, thereby being beneficial to improving the coupling efficiency. After cutting, the inner and outer cladding layers 6 on the end face of the large-core-diameter signal optical fiber are etched by using a femtosecond laser etching technology, the fiber core is micro-machined into an inner and outer surface inner conical structure (namely the receiving component 22), the inner conical angle of the outer surface is less than or equal to 90 degrees, the inner conical angle of the inner surface is more than or equal to 90 degrees, and the inner and outer conical angles are designed to meet the condition that laser forms total reflection on the inner and outer surfaces of the inner conical structure, so that the coupling loss of the laser on the end face is reduced as far as possible. The end face is flat and has no burrs. The bottom surface of the inner cone structure is a small plane perpendicular to the transmission direction of the optical fiber, the plane is not coated with a film, and the plane is used for transmitting laser output by the central signal optical fiber after the beam combination structure of the outer cone signal optical fiber is contracted. The inner and outer surfaces of the inner cone-shaped structure are coated with films for enhancing the reflectivity and the thermal conductivity of the inner and outer surfaces of the inner cone-shaped structure. The integrated double-reflection optical fiber microstructure is formed into an internal conical core-expanding optical fiber structure, and signal lasers are sequentially and orderly coupled into and out of the signal optical fibers through the double-reflection optical fiber microstructure, so that the single-fiber laser time sequence synthesis is facilitated. Large core diameter signal fiber core diameter: 25-35um, large core diameter signal optical fiber core expanded core diameter: and is more than or equal to 300um.
As shown in fig. 7 and 8, the multi-dimensional adjustable alignment fixing structure is formed by applying a fluorine-doped capillary quartz glass tube with an outer hexagon and an inner circle, and performing waist beam cutting. The multidimensional adjustable alignment fixing structure is used for fixing and aligning the outer cone-shaped signal optical fiber beam combining structure and the cone-shaped core-expanding optical fiber structure, the two structures can be naturally fixed and form a protection structure through deformation of a capillary glass tube cone region, and the outer cone-shaped signal optical fiber beam combining structure is a regular hexagon compact structure, so that the outer hexagon structure can accurately align and fix two structure groups through a side line of a microscope. The inner diameter of the outer hexagonal inner circular fluorine-doped capillary quartz glass tube is 700um-2000um, the outer diameter of the outer hexagonal fluorine-doped capillary quartz glass tube is 900um-2400um, and the inner diameter of the capillary glass tube at the middle waist beam position (namely the aligning member 31) is formed after the outer hexagonal inner circular fluorine-doped capillary quartz glass tube is fused and tapered: and is more than or equal to 300um.
The optical module packaging structure is characterized in that a pure quartz capillary quartz groove with higher thermal conductivity is used for protecting an optical module of an integral fixing structure group, a left fixing position and a right fixing position are matched with a trapezoid structure and a multi-dimensional adjustable alignment fixing structure outer hexagon structure, and the stability of an integral device is improved. Pure quartz capillary quartz groove inner diameter: 1100um-2700um, pure quartz capillary quartz groove outside diameter: 1400um-3000um.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that these drawings are included in the spirit and scope of the invention, it is not to be limited thereto.
Claims (8)
1. A laser fiber coupler, comprising:
the input assembly comprises a plurality of input optical fibers, an input member is formed at one end of each input optical fiber, and laser signals transmitted by the plurality of input optical fibers are output through the input members;
the receiving assembly is provided with a receiving optical fiber penetrating through the receiving assembly, one end of the receiving optical fiber forms a receiving member, the receiving member is arranged opposite to the input member, and the receiving assembly receives the laser signal through the receiving member;
a securing assembly for securing and axially aligning the input member and the receiving member, the securing assembly being located radially outwardly of the input assembly and the receiving assembly;
the receiving member is of an inner conical cylindrical structure;
the inner cone bottom surface of the receiving member has a receiving plane perpendicular to the optical fiber transmission direction, the receiving plane receives the laser signals emitted by the input optical fibers located at the radial center position among the plurality of input optical fibers, the annular region of the bottom surface of the receiving member receives the laser signals of other input optical fibers than the input optical fibers located at the radial center position among the plurality of input optical fibers, the inner surface of the receiving member is coated with a surface coating film in a region except the receiving plane and the outer surface in a region except the annular region, so that the laser signals received by the annular region are transmitted in a total reflection mode in the receiving member.
2. The laser fiber coupler according to claim 1, wherein the input member is an outer conical structure.
3. The laser fiber coupler according to claim 1, wherein the outer surface of the receiving member has an inner taper angle of 90 ° or less and the inner surface of the receiving member has an inner taper angle of 90 ° or more.
4. The laser fiber coupler according to claim 1, wherein the outer surface of the cross section of the fixing member is polygonal and the inner surface is circular.
5. The laser fiber coupler according to claim 4, wherein the fixing member includes an alignment member and a fixing member in an axial direction, the alignment member being provided at a middle portion of the fixing member in the axial direction, the fixing members being provided at both end portions of the fixing member in the axial direction.
6. The laser fiber coupler according to claim 5, wherein the alignment member is cylindrical and the fixing member is conical cylindrical.
7. The laser fiber coupler according to any of claims 1-6, further comprising a package assembly located radially outward of the stationary assembly.
8. A method of making a laser fiber coupler according to any of claims 1-7, the method comprising:
fusion core expansion is carried out on a plurality of input optical fibers, fusion tapering is applied to the input optical fibers of the fusion core expansion, one end of each input optical fiber is cut according to a preset angle, and the cut end face of each input optical fiber is etched to form an outer cone-shaped structure;
carrying out fusion core expansion on one end of the receiving optical fiber, cutting at the position with the maximum diameter of the core of the receiving optical fiber core expansion, and forming an inner cone-shaped structure on the cut end face of the receiving optical fiber by etching;
forming the fixing component with a bidirectional cone region structure by melt tapering a capillary quartz glass tube with a polygonal outer surface and a circular cross section inner surface;
axially aligning and securing the input member and the receiving member by the securing assembly;
the fixing component is installed in the packaging component, and the gap between the fixing component and the contact position of the packaging component is filled with ultraviolet epoxy resin glue.
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| CN114488400B (en) * | 2022-02-19 | 2023-01-24 | 中红外激光研究院(江苏)有限公司 | High-brightness optical fiber beam combiner based on evanescent wave coupling and preparation method thereof |
| CN115201967B (en) * | 2022-06-08 | 2023-06-23 | 中国电子科技集团公司第十一研究所 | Reverse optical fiber coupler |
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