Optical fiber bonding equipment and method taking carbon dioxide laser as heat source

Abstract

The invention discloses an optical fiber bonding device and method with a carbon dioxide laser as a heat source. The device comprises an operation table, the carbon dioxide laser, a light path mechanism, a five-dimensional translation table and a microscopic amplification system. A vacuum bin capable of being opened and closed is installed on the top of the operation table, the vacuum bin communicates with vacuumizing equipment, and an observation window and a laser window are installed on the vacuum bin. The carbon dioxide laser is mounted at the bottom of the console; the light path mechanism comprises a steering reflector group, a quadrangular light cone and an annular parabolic reflector which are sequentially mounted on the top surface of the operation table; the periphery of the quadrangular light cone is provided with a dispersion reflection lens group; the five-dimensional translation table is mounted on the operation table; a first clamp and a second clamp are mounted on the five-dimensional translation table; the microscopic amplification system is installed on the operation table and faces the five-dimensional translation table, and the microscopic amplification system is right opposite to the observation window. Bonding connection between the optical fiber and the end cap or other optical devices can be achieved under the low-temperature condition, and the success rate of bonding is effectively increased.

Description

Technical Field

[0001] The present invention relates to the technical field of high-power lasers, and in particular to an optical fiber bonding device and method using a carbon dioxide laser as a heat source. Background Art

[0002] Traditional optical fiber splices are divided into two types: live joints and dead joints. Live joints are active connection methods that require the use of optical fiber connectors to achieve the docking of optical fibers and pigtails, which is generally a cold connection method; dead joints are fixed connections that are achieved through a fiber fusion splicer, which melts the optical fibers at high temperatures and then connects them, which is generally a hot connection method. In order to avoid changes in the corresponding positions of the optical fiber and the crystal, and to ensure that the optical fiber connection can withstand high energy density, the optical fiber connections in laser components are mostly dead joints, so only fixed connections are considered. Faced with the situation where quartz optical fiber is positioned and connected to the end cap or other optical devices, and the fusion end face has a coating or other optical structure, the traditional fusion method is difficult to achieve due to the different end face sizes and the coating or optical structure is easily affected by high temperature, so new connection methods still need to be explored.

[0003] Traditional optical fiber thermal connection methods using optical fiber fusion splicers are generally divided into arc optical fiber fusion splicers and laser optical fiber fusion splicers according to the different heat sources used. Although arc optical fiber fusion splicers are cheap, the arc stability is poor and difficult to accurately control, resulting in a large heat-affected area and affecting surrounding materials, which may cause high fusion losses. The laser light source of the laser optical fiber fusion splicer is concentrated, the heat-affected area is small, and it is more stable and easy to control, avoiding optical fiber damage caused by overheating.

[0004] Low-temperature bonding technology is widely used in the connection of crystals. Compared with high-temperature direct bonding, the connection of crystals can be completed at a lower temperature. Among them, the wet activation process has low cost, simple process, ideal connection strength and effect. The hydrophilic bonding in the wet activation bonding can achieve a certain bonding force at low temperature, and the bonding interface is uniform, precise and transparent. It is widely used in the bonding of two materials such as quartz and optical glass. At present, the existing fusion device will destroy the properties of the optical device material, resulting in a large degree of thermal deformation during the fusion process, uneven heating and damage of the optical material, and cannot provide the environment required for low-temperature bonding of optical fiber and end cap or other optical devices.

[0005] To this end, an optical fiber bonding device and method using a carbon dioxide laser as a heat source are proposed. Summary of the invention

[0006] The object of the present invention is to provide an optical fiber bonding device and method using a carbon dioxide laser as a heat source, aiming to solve or improve at least one of the above-mentioned technical problems.

[0007] To achieve the above object, the present invention provides the following solution: The present invention provides an optical fiber bonding device using a carbon dioxide laser as a heat source, comprising:

[0008] An operating table, wherein a vacuum chamber that can be opened and closed is installed on the top of the operating table, the vacuum chamber is connected to a vacuum pumping device, and an observation window and a laser window are installed on the vacuum chamber;

[0009] A carbon dioxide laser, which is installed at the bottom of the operating table;

[0010] An optical path mechanism, the optical path mechanism comprising a steering reflector group, a quadrangular light cone and an annular parabolic reflector which are sequentially installed on the top surface of the operating table; a dispersed reflector lens group is installed around the quadrangular light cone;

[0011] A five-dimensional translation stage, the five-dimensional translation stage is installed on the operating table and is located between the four-prism light cone and the annular parabolic reflector; a first clamp and a second clamp are installed on the five-dimensional translation stage, the first clamp is used to fix the optical device to be bonded, and the second clamp is used to fix the sleeve optical fiber to be bonded;

[0012] A microscopic magnification system, which is installed on the operating table and faces the five-dimensional translation stage, and is arranged directly opposite to the observation window;

[0013] Among them, the four-prism light cone, the annular parabolic reflector, the dispersed reflective lens group, the microscope magnification system, and the five-dimensional translation stage are all located in the vacuum chamber; the steering reflector group is used to reflect the emission laser beam emitted by the carbon dioxide laser through the laser window to the four-prism light cone, and the dispersed reflective lens group is used to reflect four single laser beams dispersed from the four-prism light cone onto the annular parabolic reflector; the reflection direction of the single laser beam is set parallel to the main axis direction of the annular parabolic reflector.

[0014] According to a fiber bonding device using a carbon dioxide laser as a heat source provided by the present invention, a light through hole is provided on the operating table, and the steering reflector group includes a bracket mounted on the operating table, and the bracket is mounted with a first reflector and a second reflector; the first reflector is located below the operating table, and the second reflector is located above the operating table; the first reflector and the second reflector are both 45° reflectors;

[0015] The landing point of the emitted laser beam of the carbon dioxide laser is located at the center of the first reflector and the center of the second reflector, and the front end of the four-prism light cone is located on the central axis of the reflected laser of the second reflector.

[0016] According to a fiber bonding device using a carbon dioxide laser as a heat source provided by the present invention, the dispersed reflector lens group includes a third reflector, a fourth reflector, a fifth reflector and a sixth reflector, the third reflector and the fourth reflector are respectively located above and below the four-prism light cone, the fifth reflector and the sixth reflector are respectively located on both sides of the four-prism light cone; the third reflector, the fourth reflector, the fifth reflector and the sixth reflector are all 45° reflectors.

[0017] According to the present invention, a fiber bonding device using a carbon dioxide laser as a heat source is provided, wherein a water cooling device is installed outside the carbon dioxide laser;

[0018] The microscopic magnification system includes a vertical camera imaging calibration device and a horizontal camera imaging calibration device. The horizontal camera imaging calibration device is installed on one side of the five-dimensional translation stage, and the vertical camera imaging calibration device is installed above the five-dimensional translation stage.

[0019] According to a fiber bonding device using a carbon dioxide laser as a heat source provided by the present invention, the laser window is located on the light incident side of the vacuum chamber, and the observation window includes a vertical bar observation window and a circular observation window, and both the vertical bar observation window and the circular observation window are installed on the vacuum chamber.

[0020] According to a fiber bonding device using a carbon dioxide laser as a heat source provided by the present invention, the mirror surfaces of the first reflector, the second reflector, the third reflector, the fourth reflector, the fifth reflector and the sixth reflector, the four-prism light cone and the annular parabolic reflector are made of aluminum or coated with a reflective film.

[0021] According to the optical fiber bonding device provided by the present invention, which uses a carbon dioxide laser as a heat source, the vacuum pumping device adopts a molecular pump, which is connected to the inner cavity of the vacuum chamber through a vacuum pipe, and a vacuum valve is installed on the vacuum pipe.

[0022] The present invention also provides a fiber bonding method using a carbon dioxide laser as a heat source, comprising the following steps:

[0023] Step 1: polishing, cleaning and activating the bonding part of the sleeve optical fiber to be bonded and the bonding part of the sleeve optical fiber to be bonded respectively;

[0024] Step 2: fix the optical device to be bonded on the first fixture, and fix the sleeve optical fiber to be bonded on the second fixture;

[0025] Step 3: observe the positions of the optical device and the sleeve optical fiber through a microscope magnification system, and adjust the five-dimensional translation stage so that the bonding parts of the optical device and the sleeve optical fiber are in contact with each other and the bonding parts are at the focus of the annular parabolic reflector;

[0026] Step 4: Use vacuum equipment to evacuate the vacuum chamber;

[0027] Step 5, turn on the CO2 laser, and the emitted laser beam from the CO2 laser is emitted to the four-prism light cone through the steering reflector group, so that the emitted laser beam is evenly divided into four single laser beams, and the four single laser beams are reflected to the annular parabolic reflector through the dispersion reflector lens group. The annular parabolic reflector converges the four laser beams to the focus to provide heat for the bonding part of the optical device and the sleeve optical fiber;

[0028] Step 6: Adjust the power of the carbon dioxide laser so that the temperature at the focus of the annular parabolic reflector is stable;

[0029] Step 7: Observe the bonding state of the optical device and the fiber optic cable through a microscope magnification system;

[0030] Step 8: Turn off the vacuum equipment, open the vacuum chamber after the air pressure in the vacuum chamber stabilizes, take out the bonded device, and complete the bonding.

[0031] According to a fiber bonding method using a carbon dioxide laser as a heat source provided by the present invention, the sleeve optical fiber to be bonded comprises an optical fiber body, the outer jacket of the optical fiber body is provided with a glass sleeve, and the interior of the optical fiber body is filled with low-temperature glass powder;

[0032] In the step 1, the specific operation of grinding and polishing the bonding part of the sleeve optical fiber to be bonded is: heating and melting the optical fiber body, glass sleeve and low-temperature glass powder to form a complete cross-section on the optical fiber output surface, and grinding and polishing it by an optical fiber grinder.

[0033] According to a fiber bonding method using a carbon dioxide laser as a heat source provided by the present invention, in step 1, the sleeve fiber to be bonded is a quartz fiber, and the optical device to be bonded is a quartz end cap;

[0034] In the step 4, the vacuum environment is maintained in the vacuum chamber for 24 hours; in the step 6, the temperature at the focus of the annular parabolic reflector is kept stable for 8 hours.

[0035] The present invention discloses the following technical effects:

[0036] The present invention adopts a carbon dioxide laser as a heat source. Compared with a traditional electric arc as a heat source, the laser light source is concentrated, the heat-affected zone is small, and it is more stable and easy to control, thereby avoiding optical fiber damage caused by overheating; the emission laser beam emitted by the carbon dioxide laser is reflected by a steering reflector group onto a four-prism light cone, dispersed into four single laser beams by the four-prism light cone, and then the four single laser beams are reflected on the annular parabolic reflector along a reflection direction parallel to the main axis direction of the annular parabolic reflector by a dispersion reflector lens group, and the four laser beams are converged at a focus by the annular parabolic reflector, thereby performing uniform and continuous gradient heating on the bonding part of the optical device and the sleeve optical fiber to form a bond;

[0037] The present invention utilizes the focusing effect of the annular parabolic reflector on the light beam, with low energy loss, forming a uniform cross light spot at the heating point, so that the focus is evenly heated, thereby realizing the bonding connection between the optical fiber and the end cap or other optical devices under low temperature conditions;

[0038] The present invention can observe the position of the bonding part in real time through the micro-magnification system, and can accurately control the bonding position alignment of the optical device and the sleeve optical fiber through the five-dimensional translation stage, and maintain a certain pressure to form a pre-bonding;

[0039] The present invention uses a vacuum pumping device to evacuate the vacuum chamber, so that the heating environment is in a vacuum state, thereby improving the gap sealing between the optical device and the sleeve optical fiber, avoiding unfavorable factors such as bubbles and residual liquid on the bonding end face, thereby greatly improving the success rate of bonding and improving the quality of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 Axonometric measurement of the device of the present invention Figure I ;

[0042] Figure 2 Axonometric measurement of the device of the present invention Figure II ;

[0043] Figure 3 It is a schematic diagram of the internal structure of the device of the present invention;

[0044] Figure 4 for Figure 3 A partial enlarged view of middle A;

[0045] Figure 5 for Figure 3A partial enlarged view of B in the middle;

[0046] Figure 6 It is a schematic diagram of the structure of the first fixture, the second fixture and the five-dimensional translation stage in the present invention;

[0047] Figure 7 is a schematic structural diagram of the first clamp in the present invention;

[0048] Figure 8 is a schematic structural diagram of the second clamp in the present invention;

[0049] Fig. 9 It is a schematic diagram of the structure of a quadrangular light cone in the present invention;

[0050] Fig.10 Schematic diagram of the structure of the annular parabolic reflector in the present invention;

[0051] Fig.11 It is a schematic diagram of the structure of the sleeve optical fiber in the present invention;

[0052] Fig.12 It is a structural schematic diagram of the microscopic magnification system in the present invention;

[0053] Fig.13 This is a light path diagram of the laser beam transmitted by the present invention.

[0054] Among them, 1. carbon dioxide laser; 2. observation window; 3. four-prism light cone; 4. annular parabolic reflector; 5. first fixture; 6. second fixture; 7. five-dimensional translation stage; 8. operating table; 9. vacuum chamber; 10. molecular pump; 11. microscope magnification system; 12. optical device; 13. sleeve optical fiber; 131. optical fiber body; 132. glass sleeve; 133. low-temperature glass powder; 21. first reflector; 22. second reflector; 23. third reflector; 24. fourth reflector; 25. fifth reflector; 26. sixth reflector; 110. emitted laser beam; 120. single laser beam; 130. four laser beams. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] Reference Figure 1-Figure 13The present invention provides a fiber bonding device using a carbon dioxide laser as a heat source, comprising:

[0058] An operating table 8, on the top of which is installed an openable and closable vacuum chamber 9, the vacuum chamber 9 is connected to a vacuum pumping device, and an observation window 2 and a laser window are installed on the vacuum chamber 9;

[0059] A carbon dioxide laser 1 is installed at the bottom of the operating table 8; in this embodiment, the carbon dioxide laser 1 includes a laser cavity, a gas mixture, an excitation source, a cooling system, an optical element and a control system. By giving a control signal, the carbon dioxide laser 1 outputs a power of 0.1w to 4w, and each laser beam reaches 0.025w to 1w after beam splitting;

[0060] The optical path mechanism includes a steering reflector group, a quadrangular light cone 3 and an annular parabolic reflector 4 which are sequentially installed on the top surface of the operating table 8; a dispersed reflector lens group is installed around the quadrangular light cone 3; the focal length of the annular parabolic reflector 4 is 14 cm;

[0061] A five-dimensional translation stage 7 is installed on an operating table 8 and is located between a four-prism light cone 3 and an annular parabolic reflector 4; a first clamp 5 and a second clamp 6 are installed on the five-dimensional translation stage 7, the first clamp 5 is used to fix the optical device 12 to be bonded, and the second clamp 6 is used to fix the sleeve optical fiber 13 to be bonded; the five-dimensional translation stage 7 is divided into two parts, front and back, the first clamp 5 is installed on the front side, and the front and rear displacement of the slider can be controlled by a threaded slide rail; the second clamp 6 is installed on the back side, the height Z axis can be adjusted on the top, and the depth Y axis can be adjusted in the middle, a spring is installed on one side of the bottom of the second clamp, and an electric push rod is installed on the other side to push it, and the pitch angle of the clamp can be controlled by adjusting the push rod, two springs are installed on the left and right sides of one end of the second clamp, and two electric push rods are installed on the other side to push it, and the roll angle of the clamp can be controlled by adjusting the push rod to achieve displacement in five axes, thereby realizing convenient and accurate position adjustment of the optical device 12 and the sleeve optical fiber 13;

[0062] A microscopic magnification system 11, which is installed on the operating table 8 and faces the five-dimensional translation stage 7. The microscopic magnification system 11 is arranged opposite to the observation window 2;

[0063] Among them, the four-prism light cone 3, the annular parabolic reflector 4, the dispersed reflective lens group, the microscope magnification system 11, and the five-dimensional translation stage 7 are all located in the vacuum chamber 9; the steering reflector group is used to reflect the emission laser beam 110 emitted by the carbon dioxide laser 1 to the four-prism light cone 3 through the laser window, and the dispersed reflective lens group is used to reflect the four single laser beams 120 dispersed from the four-prism light cone 3 on the annular parabolic reflector 4; the reflection direction of the single laser beam 120 is set parallel to the main axis direction of the annular parabolic reflector 4; the four-prism light cone 3 and the annular parabolic reflector 4 are coaxially arranged;

[0064] With such arrangement, the present invention adopts a carbon dioxide laser 1 as a heat source. Compared with a traditional electric arc as a heat source, the laser light source is concentrated, the heat-affected zone is small, and it is more stable and easy to control, thereby avoiding damage to the optical fiber caused by overheating. The emission laser beam 110 emitted by the carbon dioxide laser 1 is reflected by the steering reflector group to the four-prism light cone 3, dispersed into four single laser beams 120 by the four-prism light cone 3, and then the four single laser beams 120 are reflected on the annular parabolic reflector 4 along a reflection direction parallel to the main axis direction of the annular parabolic reflector 4 by the dispersion reflector lens group. The four laser beams are converged at the focus by the annular parabolic reflector 4, thereby uniformly and continuously performing gradient heating on the bonding part of the optical device 12 and the sleeve optical fiber 13 to form bonding.

[0065] The present invention utilizes the focusing effect of the annular parabolic reflector 4 on the light beam, with low energy loss, forming a uniform cross light spot at the heating location, so that the focus is evenly heated, thereby achieving bonding connection between the optical fiber and the end cap or other optical devices under low temperature conditions;

[0066] The present invention can observe the position of the bonding part in real time through the micro-magnification system 11, and can accurately control the bonding part alignment of the optical device 12 and the sleeve optical fiber 13 through the five-dimensional translation stage 7, and maintain a certain pressure to form a pre-bonding;

[0067] The present invention uses a vacuum pumping device to evacuate the vacuum chamber 9, so that the heating environment is in a vacuum state, thereby improving the gap sealing between the optical device 12 and the sleeve optical fiber 13, avoiding unfavorable factors such as bubbles and residual liquid on the bonding end face, thereby greatly improving the success rate of bonding and improving the quality of the finished product.

[0068] According to a further optimization scheme, the ring width of the annular parabolic reflector 4 is slightly larger than the reflector width.

[0069] According to a further optimized solution, the first fixture 5 and the second fixture 6 are mounted on a five-dimensional translation stage 7, and the three are integrated as a whole.

[0070] To further optimize the solution, the upper work surface of the operating table 8 is provided with a plurality of mounting holes.

[0071] In a further optimized solution, the first clamp 5 pushes the slider through a built-in electric push rod, and a triangular cutout is provided at the slider clamping position, which can clamp and fix the optical device 12 to be bonded;

[0072] The lower cover of the second clamp 6 has a triangular cutout, the upper cover is a double-door structure, and the edge of the cover has a bevel cutout, so that the sleeve optical fiber 13 can be clamped and fixed when the cover is closed.

[0073] Further optimization scheme, a light through hole is opened on the operating table 8, and the steering reflector group includes a bracket installed on the operating table 8, and the bracket is installed with a first reflector 21 and a second reflector 22; the first reflector 21 is located below the operating table 8, and the second reflector 22 is located above the operating table 8; the first reflector 21 and the second reflector 22 are both 45° reflectors;

[0074] The landing point of the emitted laser beam 110 of the carbon dioxide laser 1 is located at the center of the first reflector 21 and the center of the second reflector 22 , and the front end of the quadrangular light cone 3 is located on the central axis of the reflected laser of the second reflector 22 .

[0075] A further optimized solution is that the dispersed reflector lens group includes a third reflector 23, a fourth reflector 24, a fifth reflector 25 and a sixth reflector 26. The third reflector 23 and the fourth reflector 24 are respectively located above and below the four-prism light cone 3, and the fifth reflector 25 and the sixth reflector 26 are respectively located on both sides of the four-prism light cone 3; the third reflector 23, the fourth reflector 24, the fifth reflector 25 and the sixth reflector 26 are all 45° reflectors.

[0076] To further optimize the solution, a water cooling device is installed outside the carbon dioxide laser 1;

[0077] The microscope magnification system 11 includes a vertical camera imaging calibration device and a horizontal camera imaging calibration device. The horizontal camera imaging calibration device is installed on one side of the five-dimensional translation stage 7, and the vertical camera imaging calibration device is installed above the five-dimensional translation stage 7.

[0078] Further optimizing the scheme, the laser window is located on the light incident side of the vacuum chamber 9, and the observation window 2 includes a vertical bar observation window and a circular observation window, and both the vertical bar observation window and the circular observation window are installed on the vacuum chamber 9;

[0079] The vacuum chamber 9 is a semi-cylindrical top structure, and the material of the laser window is zinc selenide; the vertical strip observation window is used as a skylight, and the material is strengthened glass to observe the overall bonding situation.

[0080] According to a further optimization scheme, the mirror surfaces of the first reflector 21, the second reflector 22, the third reflector 23, the fourth reflector 24, the fifth reflector 25 and the sixth reflector 26, the four-prism light cone 3 and the annular parabolic reflector 4 are made of aluminum or coated with a reflective film.

[0081] To further optimize the scheme, the vacuum pumping device adopts a molecular pump 10, which is connected to the inner cavity of the vacuum chamber 9 through a vacuum pipe, and a vacuum valve is installed on the vacuum pipe;

[0082] In this embodiment, the vacuum pipe is a metal hard pipe.

[0083] The present invention also provides a fiber bonding method using a carbon dioxide laser as a heat source, comprising the following steps:

[0084] Step 1: polishing, cleaning and activating the bonding part of the sleeve optical fiber 13 to be bonded and the bonding part of the sleeve optical fiber 13 to be bonded respectively; the bonding part of the sleeve optical fiber 13 to be bonded is polished by a grinder;

[0085] Step 2: fix the optical device 12 to be bonded on the first fixture 5, and fix the sleeve optical fiber 13 to be bonded on the second fixture 6;

[0086] Step 3: Observe the positions of the optical device 12 and the sleeve optical fiber 13 through the microscope magnification system 11, and adjust the five-dimensional translation stage 7 so that the bonding parts of the optical device 12 and the sleeve optical fiber 13 are in contact with each other and the bonding parts are at the focus of the annular parabolic reflector 4;

[0087] Step 4: vacuumize the vacuum chamber 9 by using a vacuum pumping device;

[0088] Step 5, turn on the CO2 laser 1, and the emission laser beam 110 emitted by the CO2 laser 1 is emitted to the four-prism light cone 3 through the steering reflector group, so that the emission laser beam 110 is evenly divided into four single laser beams 120, and the four single laser beams 120 are reflected to the annular parabolic reflector 4 through the dispersion reflector lens group, and the annular parabolic reflector 4 converges the four laser beams 130 to the focus to provide heat for the bonding part of the optical device 12 and the sleeve optical fiber 13;

[0089] Step 6: Adjust the power of the carbon dioxide laser 1 so that the temperature at the focus of the annular parabolic reflector 4 is stable; in this embodiment, the temperature is between 250° C. and 300° C.;

[0090] Step 7: Observe the bonding state of the optical device 12 and the sleeve optical fiber 13 through the microscope magnification system 11;

[0091] Step 8: Turn off the vacuum pumping equipment, open the vacuum chamber 9 after the air pressure in the vacuum chamber 9 is stable, take out the bonded device, and complete the bonding.

[0092] According to a further optimized solution, the sleeve optical fiber 13 to be bonded includes an optical fiber body 131, an outer jacket of the optical fiber body 131 is provided with a glass sleeve 132, and the interior of the optical fiber body 131 is filled with low-temperature glass powder 133;

[0093] In step 1, the specific operation of grinding and polishing the bonding part of the sleeve optical fiber 13 to be bonded is: heating and melting the optical fiber body 131, the glass sleeve 132 and the low-temperature glass powder 133 to form a complete cross-section of the optical fiber output surface, and grinding and polishing by an optical fiber grinder;

[0094] The outer diameter of the optical fiber body 131 is 130 μm, the outer diameter of the glass sleeve 132 is 1 mm, and the inner diameter is 500 μm;

[0095] The optical fiber body 131 and the glass sleeve 132 are connected by melting low-temperature glass powder, in order to increase the bonding area and reduce the difficulty of thinning and polishing the optical fiber.

[0096] Further optimizing the scheme, in step 1, the sleeve optical fiber 13 to be bonded is a quartz optical fiber, the clamping section diameter of the quartz optical fiber is 1 mm, and the pigtail diameter is less than 1 mm; the optical device 12 to be bonded is a quartz end cap, and the diameter of the quartz end cap is 8 mm;

[0097] In step 4, the vacuum environment in the vacuum chamber 9 is maintained for 24 hours; in step 6, the temperature at the focus of the annular parabolic reflector 4 is kept stable for 8 hours.

[0098] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0099] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For ordinary technical users in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fiber bonding device using a carbon dioxide laser as a heat source, characterized in that: include: An operating table (8), wherein a vacuum chamber (9) that can be opened and closed is installed on the top of the operating table (8), the vacuum chamber (9) is connected to a vacuum pumping device, and an observation window (2) and a laser window are installed on the vacuum chamber (9); A carbon dioxide laser (1), wherein the carbon dioxide laser (1) is installed at the bottom of the operating table (8); An optical path mechanism, the optical path mechanism comprising a steering reflector group, a four-prism light cone (3) and an annular parabolic reflector (4) which are sequentially mounted on the top surface of the operating table (8); a dispersion reflector lens group is mounted around the four-prism light cone (3); A five-dimensional translation stage (7), the five-dimensional translation stage (7) being mounted on the operating table (8) and located between the four-prism light cone (3) and the annular parabolic reflector (4); a first fixture (5) and a second fixture (6) being mounted on the five-dimensional translation stage (7), the first fixture (5) being used to fix the optical device (12) to be bonded, and the second fixture (6) being used to fix the sleeve optical fiber (13) to be bonded; A microscopic magnification system (11), the microscopic magnification system (11) being installed on the operating table (8) and facing the five-dimensional translation stage (7), the microscopic magnification system (11) being arranged directly opposite to the observation window (2); The four-prism light cone (3), the annular parabolic reflector (4), the dispersed reflector lens group, the microscope magnification system (11), and the five-dimensional translation stage (7) are all located in the vacuum chamber (9); the steering reflector lens group is used to reflect the emission laser beam (110) emitted by the carbon dioxide laser (1) through the laser window onto the four-prism light cone (3); the dispersed reflector lens group is used to reflect four single laser beams (120) dispersed from the four-prism light cone (3) onto the annular parabolic reflector (4); and the reflection direction of the single laser beams (120) is arranged parallel to the main axis direction of the annular parabolic reflector (4).

2. The optical fiber bonding device using a carbon dioxide laser as a heat source according to claim 1, characterized in that: The operating table (8) is provided with a light-through hole, the steering reflector group comprises a bracket mounted on the operating table (8), the bracket being mounted with a first reflector (21) and a second reflector (22); the first reflector (21) is located below the operating table (8), and the second reflector (22) is located above the operating table (8); the first reflector (21) and the second reflector (22) are both 45° reflectors; The landing point of the emitted laser beam (110) of the carbon dioxide laser (1) is located at the center of the first reflector (21) and the center of the second reflector (22), and the front end of the four-prism light cone (3) is located on the central axis of the reflected laser of the second reflector (22).

3. The optical fiber bonding device using a carbon dioxide laser as a heat source according to claim 2, characterized in that: The dispersed reflective mirror group comprises a third reflector (23), a fourth reflector (24), a fifth reflector (25) and a sixth reflector (26); the third reflector (23) and the fourth reflector (24) are respectively located above and below the four-prism light cone (3); the fifth reflector (25) and the sixth reflector (26) are respectively located on both sides of the four-prism light cone (3); the third reflector (23), the fourth reflector (24), the fifth reflector (25) and the sixth reflector (26) are all 45° reflectors.

4. The optical fiber bonding device using a carbon dioxide laser as a heat source according to claim 1, characterized in that: A water cooling device is installed outside the carbon dioxide laser (1); The microscopic magnification system (11) comprises a vertical camera imaging calibration device and a horizontal camera imaging calibration device, wherein the horizontal camera imaging calibration device is installed on one side of the five-dimensional translation stage (7), and the vertical camera imaging calibration device is installed above the five-dimensional translation stage (7).

5. The optical fiber bonding device using a carbon dioxide laser as a heat source according to claim 1, characterized in that: The laser window is located on the light incident side of the vacuum chamber (9), and the observation window (2) comprises a vertical bar observation window and a circular observation window, and both the vertical bar observation window and the circular observation window are mounted on the vacuum chamber (9).

6. The optical fiber bonding device using a carbon dioxide laser as a heat source according to claim 3, characterized in that: The mirror surfaces of the first reflector (21), the second reflector (22), the third reflector (23), the fourth reflector (24), the fifth reflector (25), the sixth reflector (26), the four-prism light cone (3), and the annular parabolic reflector (4) are made of aluminum or are coated with a reflective film.

7. The optical fiber bonding device using a carbon dioxide laser as a heat source according to claim 1, characterized in that: The vacuum pumping device adopts a molecular pump (10), and the molecular pump (10) is connected to the inner cavity of the vacuum chamber (9) through a vacuum pipeline, and a vacuum valve is installed on the vacuum pipeline.

8. A fiber bonding method using a carbon dioxide laser as a heat source, based on the fiber bonding device using a carbon dioxide laser as a heat source according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: polishing, cleaning and activating the bonding part of the sleeve optical fiber (13) to be bonded and the bonding part of the sleeve optical fiber (13) to be bonded respectively; Step 2: fix the optical device (12) to be bonded on the first fixture (5), and fix the sleeve optical fiber (13) to be bonded on the second fixture (6); Step 3: Observe the positions of the optical device (12) and the sleeve optical fiber (13) through the microscope magnification system (11), and adjust the five-dimensional translation stage (7) so that the bonding parts of the optical device (12) and the sleeve optical fiber (13) are in contact with each other, and the bonding parts are located at the focus of the annular parabolic reflector (4); Step 4: evacuate the vacuum chamber (9) using a vacuum evacuation device; Step 5, turning on the carbon dioxide laser (1), the emission laser beam (110) emitted by the carbon dioxide laser (1) is emitted to the four-prism light cone (3) through the steering reflector group, so that the emission laser beam (110) is evenly divided into four single laser beams (120), and the four single laser beams (120) are reflected to the annular parabolic reflector (4) through the dispersion reflector group, and the annular parabolic reflector (4) converges the four laser beams (130) to the focus to provide heat for the bonding part of the optical device (12) and the sleeve optical fiber (13); Step 6: Adjust the power of the carbon dioxide laser (1) so that the temperature at the focus of the annular parabolic reflector (4) is stable; Step 7: Observe the bonding state of the optical device (12) and the sleeve optical fiber (13) through the microscope magnification system (11); Step 8: Turn off the vacuum pumping equipment, open the vacuum chamber (9) after the air pressure in the vacuum chamber (9) is stabilized, take out the bonded device, and complete the bonding.

9. The optical fiber bonding method using a carbon dioxide laser as a heat source according to claim 8, characterized in that: The sleeve optical fiber (13) to be bonded comprises an optical fiber body (131), the optical fiber body (131) is provided with a glass sleeve (132) on its outer shell, and the interior of the optical fiber body (131) is filled with low-temperature glass powder (133); In the step 1, the specific operation of grinding and polishing the bonding part of the sleeve optical fiber (13) to be bonded is: heating and melting the optical fiber body (131), the glass sleeve (132) and the low-temperature glass powder (133) to form a complete cross-section on the optical fiber output surface, and grinding and polishing by an optical fiber grinder.

10. The optical fiber bonding method using a carbon dioxide laser as a heat source according to claim 8, characterized in that: In the step 1, the sleeve optical fiber (13) to be bonded is a quartz optical fiber, and the optical device (12) to be bonded is a quartz end cap; In the step 4, the vacuum environment in the vacuum chamber (9) is maintained for 24 hours; and in the step 6, the temperature at the focus of the annular parabolic reflector (4) is kept stable for 8 hours.

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