A heat dissipation packaging method for a beam combiner

Abstract

The present invention belongs to the technical field of combiner packaging, and discloses a heat dissipation packaging method for a combiner. By adopting a shell structure including only a placement piece and a sleeve, the packaging of an optical fiber bundle can be made simpler and low-cost. In addition, by gradually coating the bare fibers of the output single fibers of the optical fiber bundle of the combiner with low-refractive index glue with successively increasing refractive index, the heat-inducing light leaked to the coating layer of the output single fiber can be dispersed in advance instead of being completely concentrated on the subsequent optical fiber coating layer, thereby effectively reducing the risk of optical fiber heating and burning. At the same time, by coating the coating layer with high-refractive index glue, the temperature of the optical fiber coating can be further effectively reduced, thereby achieving temperature stability and effective heat dissipation of the output single fiber.

Description

Technical Field

[0001] The present invention belongs to the technical field of beam combiner packaging, and in particular relates to a beam combiner heat dissipation packaging method. Background Art

[0002] Fiber combiner is one of the core components of fiber laser, mainly used for pump coupling of fiber laser. Fiber combiner can efficiently couple the energy of multiple lasers into one fiber for transmission. Its power is generally tens of watts, hundreds of watts, or even kilowatts. Such high-power operation makes the heat dissipation problem of fiber combiner more and more prominent.

[0003] In an existing beam combiner, Figure 1 As shown, it includes two concave quartz components, one as the installation groove of the optical fiber bundle, and the other as the cover plate. The two are encapsulated by interlocking with each other, and the outer shell is a concave metal groove and a metal cover plate for sealing. However, the structure of the combiner is relatively complex, the cost is increased, and the metal shell absorbs heat and easily transfers heat to the output fiber, causing the output fiber to heat up or even burn. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a heat dissipation packaging method for a combiner, so as to solve the problem that the existing combiner packaging method has a complex structure and the output fiber is prone to heat.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A heat dissipation packaging method for a beam combiner comprises the following steps:

[0007] A placement piece with a placement groove and a sleeve for placing the placement piece are provided for use, wherein the outer shape of the placement piece is matched with the inner shape of the sleeve, and the length of the sleeve is longer than that of the placement piece;

[0008] The tapered pump fiber is bonded to the signal fiber with a portion of the coating removed, and then they are burned and fused to obtain an optical fiber bundle;

[0009] The fired and fused optical fiber bundle is initially fixed in the placement groove of the placement piece, and the center of the bare fiber section of the optical fiber bundle is suspended in the air;

[0010] At least two kinds of low-refractive glues with increasing refractive index are dispensed along the direction from the input to the output of the optical fiber at a point 0.5-2 cm away from the pump fiber break point at the output end of the optical fiber bundle to form multiple glue coverage areas, and the glue coverage area with the highest refractive index among the multiple glue coverage areas covers the stripping point at the output end of the optical fiber bundle;

[0011] Use high-refractive glue to cover the uncovered coating layers at both ends of the optical fiber bundle in the placement groove to form multiple heat dissipation coverage areas;

[0012] Put the sleeve on the outside of the placement piece and inject high-fold glue from both ends of the sleeve to fix the placement piece.

[0013] In a possible implementation, the optical fiber bundle after burning and fusion is initially fixed in the placement groove of the placement member, and the center of the bare fiber section of the optical fiber bundle is suspended in the air, including the following methods:

[0014] The first glue with low refractive index is dispensed at the bare fiber at the input end of the optical fiber bundle to fix the relative position of the pump fiber and the signal fiber;

[0015] Place the optical fiber bundle into the placement groove of the placement piece, and make the center of the bare fiber section of the optical fiber bundle hang in the air;

[0016] Use the first glue to dispense glue to the area near the stripping point of the input end of the optical fiber bundle in the placement groove and cover the solidified first glue in the area.

[0017] In a possible implementation, when the optical fiber bundle is placed in the placement groove of the placement piece, the stripping point at the input end of the optical fiber bundle is 20-30 mm away from the adjacent end edge of the placement groove, and the stripping point at the output end of the optical fiber bundle is 40-50 mm away from the adjacent end edge of the placement groove.

[0018] In a possible implementation, the refractive index of the glue used in the multiple glue coverage areas is in the range of 1.0-1.4, and the incremental values ​​of the refractive index of the multiple glue coverage areas are the same, and the incremental value range is 0.01-0.05.

[0019] In a possible implementation, each of the plurality of glue coverage areas has the same length and is 8-10 mm.

[0020] In a possible implementation, a sleeve is put on the outside of the placement piece, and high-fold glue is poured from both ends of the sleeve to fix the placement piece, including the following methods:

[0021] Pour high-fold glue into the needle tube device and remove the bubbles in the needle tube device;

[0022] Insert the needle tube of the needle tube device into the casing 3-7mm from both ends and inject high-fold glue. When the high-fold glue fills both sides of the casing, perform UV curing to fix the placement piece in the casing.

[0023] In a possible implementation, the sleeve and the placement piece are both made of quartz material.

[0024] In a possible implementation, the optical fiber bundle includes two pump fibers and one signal fiber, and the tapered parts of the two pump fibers are fused to both sides of the bare fiber of the signal fiber.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The heat dissipation packaging method for a combiner of the present invention can make the packaging of the optical fiber bundle simpler and lower in cost by adopting a shell structure including only a placement piece and a sleeve, and by gradually coating the bare fibers of the output single fibers of the optical fiber bundle of the combiner with low-refractive index glues with successively increasing refractive indexes, the heat-inducing light leaked to the coating layer of the output single fiber will be dispersed in advance instead of being completely concentrated on the subsequent optical fiber coating layer, thereby effectively reducing the risk of optical fiber heating and burning. At the same time, by coating the coating layer with high-refractive index glue, the temperature of the optical fiber coating is further effectively reduced, thereby achieving temperature stability and effective heat dissipation of the output single fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an existing beam combiner;

[0028] Figure 2 A schematic diagram of the energy distribution of pump light coupled to the inner cladding of a signal fiber by an existing optical fiber bundle;

[0029] Figure 3 A three-dimensional view of a placement component of a beam combiner heat dissipation packaging method;

[0030] Figure 4 A three-dimensional view of a sleeve of a beam combiner heat dissipation packaging method;

[0031] Figure 5 A schematic diagram of the structure of an optical fiber bundle of a combiner heat dissipation packaging method;

[0032] Figure 6 A schematic diagram of a method for heat dissipation packaging of a beam combiner in which the relative positions of optical fibers are fixed by dispensing a first glue;

[0033] Figure 7 A schematic diagram of the positioning position of a beam combiner heat dissipation packaging method when placing an optical fiber bundle into a placement groove of a placement member;

[0034] Figure 8 A schematic diagram of a beam combiner heat dissipation packaging method passing through the first glue dispensing position for the second time;

[0035] Fig. 9 A schematic diagram of the positions of the low-fold glues that are dispensed in increasing order in a method for heat dissipation packaging of a beam combiner;

[0036] Fig.10 A schematic diagram of the high-fold glue dispensing position of a beam combiner heat dissipation packaging method;

[0037] Fig.11 A schematic side view of a method for heat dissipation packaging of a beam combiner in which a placement component is enclosed in a sleeve;

[0038] Fig.12A schematic diagram comparing a beam combiner using a beam combiner heat dissipation packaging method and a beam combiner using existing metal packaging.

[0039] In the figure: 1-placement piece; 11-placement groove; 2-sleeve; 3-peeling mouth; 4-bonding melting area; 5-bare fiber area; 6-low-fold glue fixing area; 7-low-fold glue covering fixing area; 8-first dispersion area; 9-second dispersion area; 10-third dispersion area; 100-pump fiber break point position; 110-high-fold glue dispensing point; 120-high-fold glue packaging area. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0041] Please refer to Figure 2 As shown in the figure, after the pump light of the combiner passes through the tapered pump fiber, it will be coupled into the inner cladding of the double-clad fiber from the side of the double-clad signal fiber. However, not all pump light can be effectively coupled into the signal fiber. The pump light energy that is not coupled into the inner cladding of the signal fiber can be divided into three categories: (1) Pump light power leaked from the transition zone of the tapered fiber. The pump light must first pass through the tapered transition zone of the tapered fiber. A portion of the pump light with a larger incident angle will quickly increase its transmission angle in the tapered area. Even if it exceeds the critical angle of the pump fiber and enters the signal fiber, it cannot be bound by the inner cladding of the signal fiber and leaks into the air. This part of the light is Figure 2 (2) The residual pump light power of the pump fiber. If the incident angle of the pump light is small or the taper of the pump fiber is small, this part of the pump light will remain in the pump fiber during the transmission of the pump fiber because the transmission angle does not reach the critical angle of the pump fiber. The pump light will eventually transfer from the end of the pump fiber to the air. This part of the light is Figure 2 (3) Heat loss from the signal fiber coating, which is the LPE in the Figure 2 In the LPC, this part of the pump light is coupled into the double-clad signal fiber. Since the transmission angle exceeds the critical angle of the inner cladding of the double-clad signal fiber, the pump light leaks from the inner cladding of the signal fiber into the coating layer and is converted into heat energy and accumulated on the optical device, causing the output fiber temperature to rise. This part is one of the most important parameters that restrict the power that the device can withstand.

[0042] To solve this problem and the problems of complex structure and high cost, please refer to Figure 3-12 As shown, an embodiment of the present application provides a heat dissipation packaging method for a beam combiner, comprising the following steps:

[0043] Step S100: providing a placement piece 1 having a placement groove 11 and a sleeve 2 for placing the placement piece 1 for standby use, wherein the outer shape of the placement piece 1 is matched with the inner shape of the sleeve 2, and the sleeve 2 is longer than the placement piece 1.

[0044] In this step, the sleeve 2 is used to place the placement piece 1, and together with the placement piece 1, it forms a combiner housing component for encapsulating optical fiber bundles. The placement piece 1 places the optical fiber bundle through the placement groove 11 provided thereon, and its outer shape is adapted to the inner shape of the sleeve 2, so that it is convenient for the placement piece 1 to be inserted into the sleeve 2 for encapsulation, and no other components are required. The structure is simpler, easier to operate, and the cost is reduced. The length of the sleeve is longer than the placement piece 1, so that it is convenient to seal the two ends of the placement piece 1 after it is placed in the sleeve. The purpose of the placement groove 11 is to place the optical fiber bundle. In the specific implementation process, it only needs to be larger in width and depth than the corresponding optical fiber bundle diameter. There is no clear requirement for the shape, and semicircular or U-shaped are both acceptable. The structure with a trapezoidal cross-sectional shape can be easily processed and manufactured.

[0045] Step S100: Laminating the tapered pump fiber and the signal fiber with a portion of the coating removed, and then sintering and fusing them to obtain an optical fiber bundle.

[0046] In this step, the signal fiber is stripped of a certain length of coating, one or more pump fibers with good taper are bonded to the outside of the signal fiber and bonded, and the bonded molten area 4 is burned by a hydrogen-oxygen taper machine to obtain a fiber bundle to be packaged. The fiber bundle has a stripped end 3, a bonded molten area 4 and a bare fiber area 5.

[0047] Step S200: Preliminarily fix the fired and fused optical fiber bundle in the placement groove 11 of the placement member 1, and make the center of the bare fiber section of the optical fiber bundle suspended in the air.

[0048] In this step, the optical fiber bundle is initially fixed after being placed in the placement groove 11, and the center section of the bare fiber section is suspended in the air, so that it can be initially fixed in the placement groove 11. In the specific implementation process, the optical fiber bundle can be placed in the placement groove 11 in a straightened state through an external fixing base or other tools.

[0049] Step S300: Starting from 0.5-2 cm away from the pump fiber break point at the output end of the optical fiber bundle, at least two low-refractive glues with increasing refractive indices are dispensed along the optical fiber input to output direction to form multiple glue covering areas, and the glue covering area with the highest refractive index among the multiple glue covering areas covers the stripping point at the output end of the optical fiber bundle.

[0050] In this step, at least two low-refractive glues with increasing refractive index are dispensed along the direction of the optical fiber input to the output direction at a starting point of 0.5-2 cm from the pump fiber breakpoint at the output end of the optical fiber bundle, so as to gradually transfer the light heat to each part of the glue, thereby balancing the heat generation. Since a small part of the pump light will continue to transmit forward after passing through the cone area, it will leak into the output single fiber coating layer and cause the coating layer to heat up. The higher the refractive index, the more refracted light, and the more obvious the heat dissipation. Therefore, gradually applying low-refractive glue on the bare fiber of the output single fiber (i.e., the output end) of the combiner will advance and disperse this part of the light-induced heat, and the dispersion effect can be gradually improved during the dispersion process, which can make the dispersion of this part of the light more continuous and effective, so that it will not be completely concentrated on the subsequent optical fiber coating layer, reducing the risk of optical fiber heating and burning. At the same time, the optical fiber bundle can be completely fixed in the placement piece 1 by gradually dispensing glue in conjunction with the fixation of the other end.

[0051] Step S400: Use high-refractive glue to cover the uncovered coating layers at both ends of the optical fiber bundle in the placement groove 11 to form a plurality of heat dissipation covering areas.

[0052] In this step, the remaining coating layers of the multi-fibers and single fibers in the placement groove 11 are coated with high-refraction glue to dissipate heat for the coating layers.

[0053] Step S500: insert the sleeve 2 onto the outside of the placement piece 1 , and inject high-fold glue from both ends of the sleeve 2 to fix the placement piece 1 .

[0054] In this step, the sleeve 2 can be sealed from both ends of the sleeve 2 by using high-resistance glue, and at the same time, better heat dissipation requirements can be met.

[0055] It can be understood that the glue used is UV glue, which is convenient for curing operation, and the high and low refractive index values ​​are relative to the refractive index of the optical fiber cladding, and the low refractive index value is the refractive index value after curing. In the specific implementation process, the threshold value is 1.5.

[0056] Through the above technical scheme, a shell structure including only a placement piece 1 and a sleeve 2 is adopted, so that the packaging of the optical fiber bundle can be made simpler and low-cost, and by gradually coating the bare fiber of the output single fiber of the optical fiber bundle of the combiner with low-refractive glue with successively increasing refractive index, the heating light leaked to the coating layer of the output single fiber will be dispersed in advance instead of being completely concentrated on the subsequent optical fiber coating layer, which effectively reduces the risk of optical fiber heating and burning. At the same time, by coating the coating layer with high-refractive glue, the temperature of the optical fiber coating is further effectively reduced, thereby achieving temperature stability and effective heat dissipation of the output single fiber.

[0057] In one embodiment, step S300 includes the following method:

[0058] Step S310: dispensing a first glue with a low refractive index on the bare fiber at the input end of the optical fiber bundle to fix the relative positions of the pump fiber and the signal fiber;

[0059] Step S320: placing the optical fiber bundle into the placement groove 11 of the placement member 1, and suspending the center of the bare fiber segment of the optical fiber bundle in the air;

[0060] Step S330: Use the first glue to dispense glue to the area near the stripping point of the input end of the optical fiber bundle in the placement groove 11 and cover the solidified first glue in the area.

[0061] In this way, the pump fiber and the signal fiber are glued with the first glue with a low refractive index, such as Figure 6 The low-fold glue fixing area 6 is cured by ultraviolet light, so that the relative positions of multiple optical fibers can be fixed to prevent the fiber bundle from being dispersed due to force during the subsequent movement of the fiber bundle, and then the first glue is applied to the area near the stripping point and covers the first glue in step S310, that is, a low-fold glue covering fixing area 7 is formed, so that one end of the fiber bundle with multiple fibers can be completely suspended and fixed in the placement groove 11.

[0062] Furthermore, when the optical fiber bundle is placed in the placement groove 11 of the placement member 1, the stripping point at the input end of the optical fiber bundle is 20-30 mm away from the adjacent end edge of the placement groove 11, and the stripping point at the output end of the optical fiber bundle is 40-50 mm away from the adjacent end edge of the placement groove 11.

[0063] In this way, the distance between the stripping point and the edge of the groove is convenient for the application of high-fold glue, which mainly plays a fixing role for the entire optical fiber bundle. Therefore, the required length only needs to be sufficient to fix the optical fiber in the quartz groove. The distance between the single fiber stripping point and the high-fold glue placed in the edge area of ​​the groove 11 has a heat dissipation effect and should not be too short. The shortening of the intervals on both sides can shorten the overall package size of the combiner, but the corresponding output fiber temperature will rise. Therefore, it is necessary to balance the glue dispensing length and the temperature rise. The specific distance interval can correspond to the package length, and the length can be changed accordingly according to the actual situation. For example, when the package length is shortened to 10cm, the distance intervals on both ends can be 10mm and 20mm.

[0064] In order to better utilize the low-refractive glue to achieve a better dispersion effect, further, the glue refractive index range of the multiple glue coverage areas is 1.0-1.4, and the incremental refractive index increments of the multiple glue coverage areas are the same, and the incremental value range is 0.01-0.05.

[0065] In this way, by gradually increasing the refractive index of the glue, the light and heat can be gradually transferred to each part of the glue, thereby making the heat balanced, and by using glue with a refractive index range of 1.0-1.4 to form a glue coverage area, the refractive index increment value is the same and the increment value range is 0.01-0.05. Compared with using low-refractive glue with the same refractive index, this can make the dispersion effect have a progressive enhancement effect while also making the dispersion continuous, so that multiple glue coverage areas can be continuously coordinated and dispersed, and the dispersion effect is better.

[0066] In the specific implementation process, the smaller the refractive index of the glue, the more difficult it is to make and the higher the cost. The refractive index value is based on the feasibility of actual purchase. Theoretically, the refractive index range can be between [1, 1.4], but the gradient difference between the three glues should not be too large to avoid uniform heat. After many experiments, the gradient, that is, the incremental value range is 0.1 to 0.5.

[0067] In addition, each of the plurality of glue coverage areas has the same length of 8-10 mm, and such coverage length can make the glue coverage area have a better dispersion effect.

[0068] In the embodiment of the present application, step S500 may include the following method:

[0069] Step S510: Pour high-fold glue into the needle tube device, and remove the bubbles in the needle tube device.

[0070] Step S520: insert the needle tube of the needle tube device into the sleeve 2 from both ends by 3-7 mm and then inject high-fold glue. When the high-fold glue fills both sides of the sleeve 2, perform ultraviolet light curing to fix the placement piece 1 in the sleeve 2.

[0071] By using the above-mentioned glue injection method, the packaging of the sleeve 2 can be achieved more conveniently.

[0072] Preferably, the sleeve 2 and the placement member 1 are both made of quartz material. The pure quartz packaging structure is adopted so that the heat of the combiner packaging shell can be effectively diffused outward without being transferred to the optical fibers on both sides; at the same time, the quartz packaging structure is made of the same material as the optical fiber quartz, which can ensure that the packaging material changes equally with the internal optical fiber bundle at any working temperature. Specific embodiment:

[0074] Taking the production of a side-bonded 2+1 combiner as an example, two pump fibers are symmetrically bonded to the two sides of one signal fiber.

[0075] 1. Packaging structure such as Figure 3 and Figure 4As shown, it includes a placement piece 1 with a trapezoidal placement groove 11 and a circular sleeve 2. The placement groove 11 is used to place the optical fiber, and the sleeve 2 is used to seal the device. Both are made of quartz material. The placement piece 1 is 140 mm long, and the sleeve 2 is 150 mm long.

[0076] 2. Strip 70mm of the coating layer of the signal fiber, and bond the two pump fibers with tapered ends to the two sides of the signal fiber. The bonding length is 3cm. Use a hydrogen-oxygen taper machine to burn and fuse the fiber bundle in the bonding area. Figure 5 shown.

[0077] 3. After firing, Figure 6 As shown, glue with a refractive index of 1.35 and a length of 2 mm is applied to the bare fiber 5 mm away from the multi-fiber stripping port 3 and is cured using an ultraviolet lamp.

[0078] 4. Use an external fixing base or other tool to place the optical fiber bundle into the placement groove 11 of the placement member 1, and make it hang in the center of the placement groove 11. The specific placement and positioning is as follows: Figure 7 As shown, the multi-fiber stripping point is 25 mm away from the slot edge, and the single-fiber stripping point is 45 mm away from the slot edge.

[0079] 5. Combine Figure 8 As shown, glue with a low refractive index of 1.35 is used again to fill the 5 mm area around the multi-fiber stripping opening 3 (the boundary between the coating layer and the bare fiber) in the placement groove 11, and cover the glue applied in step 3, so that the optical fiber bundle is completely suspended and fixed in the placement groove 11.

[0080] 6. Combine Fig. 9 As shown, at a distance of 1 cm from the breakpoint of the pump fiber, low-refractive index glues with refractive indices of 1.35, 1.36 and 1.37 are sequentially applied to the bare signal fiber after curing, and the glue application lengths are 10 mm, 10 mm and 10 mm, respectively, which are the first dispersion area 8, the second dispersion area 9 and the third dispersion area 10, wherein the glue with a refractive index of 1.37 covers the stripping point of the output fiber (i.e., the output end).

[0081] 7. Use high-reflectivity glue to cover the remaining 2cm and 4cm coating layers of the multi-fiber and single-fiber in the groove to dissipate heat from the optical fiber coating layer, such as Fig.10 and Fig.11 The high-fold glue dispensing location 110 is shown.

[0082] 8. Pass the circular sleeve 2 from the output fiber to the placement piece 1, so that the placement piece 1 is completely embedded therein.

[0083] 9. Pour UV high refractive index glue into the needle tube device, remove bubbles, and insert the needle tube into the sleeve 2 from both sides for 5mm to dispense glue. When the glue fills 5mm on both sides of the sleeve 2, perform UV curing to completely fix the placement piece 1 in the sleeve 2. Fig.11The high-fold glue packaging area 120 is shown.

[0084] Other packaging instructions:

[0085] 1. All glues are UV glue, which is convenient for operation and curing;

[0086] 2. All glue removed Figure 6 The low refractive index glue in the fiber bundle is suspended at a point on the fiber bundle. Fig.11 The high refractive index glue is applied inside the two sides of the sleeve 2, and the rest is applied to fill the placement groove 11 of the placement member 1 in the glue application area, flush with the height of the placement groove 11, to fix and dissipate heat for the optical fiber bundle;

[0087] 3. The high and low refractive index values ​​of the glue are relative to the refractive index of the optical fiber cladding, and the low refractive index value is the refractive index value after curing;

[0088] 4. The length of the placement piece 1 is shorter than the sleeve 210mm, so that after it is inserted into the sleeve 2, 5mm points of high refractive index glue are reserved at both ends to fix the placement piece 1 in the sleeve 2;

[0089] 5. The low-refractive-index glue cannot cover the breakpoint of the pump fiber and should be kept at a certain distance to prevent the glue from heating up due to the light coming out of the optical fiber.

[0090] The comparison between the beam combiner packaged by the above packaging method and the existing metal shell beam combiner can be referred to Fig.12 As shown, the beam combiner of this embodiment is superior to the metal beam combiner in terms of volume, weight and structural complexity. For details, please refer to Table 1.

[0091] Table 1 Comparison table between existing beam combiners and the beam combiner of this application

[0092] Encapsulation Number of components length Cross-sectional area quality Metal beam combiner 5 140mm 120mm² 54g Quartz beam combiner 2 140mm 28.3mm² 7g

[0093] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A heat dissipation packaging method for a beam combiner, characterized in that: The following steps are involved: A placement piece with a placement groove and a sleeve for placing the placement piece are provided for use, wherein the outer shape of the placement piece is matched with the inner shape of the sleeve, and the length of the sleeve is longer than that of the placement piece; The tapered pump fiber is bonded to the signal fiber with a portion of the coating removed, and then they are burned and fused to obtain an optical fiber bundle; The fired and fused optical fiber bundle is initially fixed in the placement groove of the placement piece, and the center of the bare fiber section of the optical fiber bundle is suspended in the air; At least two kinds of low-refractive glues with increasing refractive index are dispensed along the direction from the input to the output of the optical fiber at a point 0.5-2 cm away from the pump fiber break point at the output end of the optical fiber bundle to form multiple glue coverage areas, and the glue coverage area with the highest refractive index among the multiple glue coverage areas covers the stripping point at the output end of the optical fiber bundle; Use high-refractive glue to cover the uncovered coating layers at both ends of the optical fiber bundle in the placement groove to form multiple heat dissipation coverage areas; Put the sleeve on the outside of the placement piece, and inject high-fold glue from both ends of the sleeve to fix the placement piece; Wherein, the refractive index range of the glue used in the multiple glue coverage areas is 1.0-1.

4.

2. A beam combiner heat dissipation packaging method as claimed in claim 1, characterized in that: The tapered pump fiber is bonded to the signal fiber with a portion of the coating removed, and then burned and fused to obtain an optical fiber bundle, including the following methods: The first glue with low refractive index is dispensed at the bare fiber at the input end of the optical fiber bundle to fix the relative position of the pump fiber and the signal fiber; Place the optical fiber bundle into the placement groove of the placement piece, and make the center of the bare fiber section of the optical fiber bundle hang in the air; Use the first glue to dispense glue to the area near the stripping point of the input end of the optical fiber bundle in the placement groove and cover the solidified first glue in the area.

3. A beam combiner heat dissipation packaging method as claimed in claim 2, characterized in that: When the optical fiber bundle is placed in the placement groove of the placement piece, the stripping point at the input end of the optical fiber bundle is 20-30 mm away from the adjacent end edge of the placement groove, and the stripping point at the output end of the optical fiber bundle is 40-50 mm away from the adjacent end edge of the placement groove.

4. A beam combiner heat dissipation packaging method as claimed in claim 1, characterized in that: The incremental refractive index values ​​of the multiple glue coverage areas are the same, and the incremental value range is 0.01-0.

05.

5. A beam combiner heat dissipation packaging method as claimed in claim 1, characterized in that: Each of the multiple glue covering areas has the same length and is 8-10 mm.

6. A beam combiner heat dissipation packaging method as claimed in claim 1, characterized in that: Put the sleeve on the outside of the placement piece and inject high-fold glue from both ends of the sleeve to fix the placement piece, including the following methods: Pour high-fold glue into the needle tube device and remove the bubbles in the needle tube device; Insert the needle tube of the needle tube device into the casing 3-7mm from both ends and inject high-fold glue. When the high-fold glue fills both sides of the casing, perform UV curing to fix the placement piece in the casing.

7. A beam combiner heat dissipation packaging method as claimed in claim 1, characterized in that: The sleeve and the placement piece are both made of quartz material.

8. A beam combiner heat dissipation packaging method as claimed in claim 1, characterized in that: The optical fiber bundle includes two pump fibers and one signal fiber, and the tapered parts of the two pump fibers are fused to both sides of the bare fiber of the signal fiber.

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