A laser-coupled optical fiber output head

Abstract

The present invention relates to the field of laser transmission technology and discloses a laser-coupled optical fiber output head, comprising: an outer shell having an inner cavity; a sleeve inserted into the inner cavity; a first glass capillary tube and a second glass capillary tube, the first glass capillary tube and the second glass capillary tube being inserted into the sleeve; an optical fiber body, the optical fiber body comprising a core layer, an optical fiber cladding, and a coating layer; the first glass capillary tube having a first fixed section, the first fixed section having a first outlet and a first inlet, the diameter of the first inlet being greater than the diameter of the optical fiber cladding, the diameter of the first outlet being greater than the diameter of the optical fiber core layer and less than or equal to the diameter of the optical fiber cladding, and the optical fiber body being suspended between the first inlet and the second outlet; and the second glass capillary tube having a second fixed section, the second fixed section having a second outlet and a second inlet, the diameter of the second inlet being greater than the diameter of the coating layer, the diameter of the second outlet being greater than the diameter of the optical fiber cladding and less than the diameter of the coating layer.

Description

Technical Field

[0001] The present invention relates to the field of laser transmission technology, in particular to a laser coupling optical fiber output head. Background Art

[0002] A fiber coupler is a device that provides a removable, flexible connection between optical fibers. It precisely connects the two ends of the fibers to maximize the coupling of light energy from the transmitting fiber to the receiving fiber, minimizing the impact of the fiber's presence on the optical link. During coupling, as the output power increases, the outer shell in contact with the fiber expands due to heat, potentially damaging the fiber itself.

[0003] Patent authorization publication number CN114865429B discloses a laser output head and laser output device, comprising: a thermal compensation housing provided with an expansion tube capable of expanding when heated; a lens housing with a lens mounted therein; a quartz rod housing connected between the thermal compensation housing and the lens housing, with a quartz rod fixedly mounted on the quartz rod housing; and an optical fiber passed through the expansion tube, with one end of the optical fiber extending out of the expansion tube and fixedly connected to the quartz rod, the expansion tube having a fixed end for fixedly connecting to the thermal compensation housing, and an end of the expansion tube located between the fixed end and the quartz rod fixedly connected to the optical fiber; a glass tube provided at one end of the expansion tube near the quartz rod housing, the expansion tube having a channel having radial dimensions adapted to those of the glass tube, the glass tube and the expansion tube being fixedly connected by gluing or soldering, the optical fiber passed through the glass tube, and the optical fiber and the end of the glass tube near the quartz rod housing being fixedly connected by gluing or soldering.

[0004] The aforementioned laser output head uses a thermal expansion tube to offset fiber deformation caused by the expansion of the thermal compensation housing and the quartz rod housing. If the fiber is damaged during the coupling process, it must be removed from the output head and the damaged portion removed. However, the fiber inside the output head is secured with glue or solder, which hinders fiber extraction and prevents quick repair. Summary of the Invention

[0005] The purpose of the present invention is to provide a laser-coupled optical fiber output head to solve the problem in the prior art that the output head is blocked when the optical fiber is damaged and needs to be extracted, and cannot be quickly repaired.

[0006] In order to achieve the above object, the present invention provides a laser-coupled optical fiber output head, comprising:

[0007] a housing having an inner cavity extending through the housing in a front-to-back direction;

[0008] a cannula, the cannula being inserted into the inner cavity;

[0009] a first glass capillary tube and a second glass capillary tube, wherein the first glass capillary tube and the second glass capillary tube are inserted into the sleeve along a front-to-back direction, and the first glass capillary tube is located in front of the second glass capillary tube;

[0010] An optical fiber body, the optical fiber body being inserted into the first glass capillary and the second glass capillary, the optical fiber body comprising a core layer, an optical fiber cladding covering the outer side of the core layer, and a coating layer covering the outer side of the optical fiber cladding;

[0011] The first glass capillary has a first fixed section, the first fixed section having a first outlet at a front end and a first inlet at a rear end, the diameter of the first inlet being larger than the diameter of the optical fiber cladding, the diameter of the first outlet being larger than the diameter of the fiber core layer and smaller than or equal to the diameter of the optical fiber cladding, and the inner diameter of the first fixed section first increases and then decreases from the first inlet to the first outlet so that the optical fiber body is suspended between the first inlet and the first outlet;

[0012] The second glass capillary has a second fixed section, the second fixed section has a second outlet located at the front end and a second inlet located at the rear end, the diameter of the second inlet is larger than the diameter of the coating layer, and the diameter of the second outlet is larger than the diameter of the optical fiber cladding and smaller than the diameter of the coating layer.

[0013] Preferably, the inner wall surface of the first fixing section is a curved structure along the first inlet to the first outlet.

[0014] Preferably, the inner wall surface of the second fixing section is a conical structure along the second inlet to the second outlet.

[0015] Preferably, it also includes a magnetic seat, which includes a magnetic pressure base and a magnetic pressure cover. The magnetic pressure base and the outer shell are detachable and assembled. The magnetic pressure cover and the magnetic pressure base are fixed by magnetic attraction along the radial direction of the optical fiber body. The side of the magnetic pressure base close to the magnetic pressure cover has a V-shaped groove extending in the front-to-back direction, and the V-shaped groove is used to assemble the optical fiber body.

[0016] Preferably, the magnetic seat further includes a pad, and a side of the magnetic pressure cover close to the magnetic pressure base has a pad groove, and the pad is assembled in the pad groove.

[0017] Preferably, the magnetic seat also includes a magnetic pressure sheath and a hose, the magnetic pressure sheath is sleeved on the outside of the magnetic pressure base and the magnetic pressure cover, the magnetic pressure sheath is fixedly assembled with the magnetic pressure base, the hose is assembled at the rear end of the magnetic pressure sheath, and the optical fiber body is passed through the hose.

[0018] Preferably, the sleeve includes a main sleeve and a sub-sleeve arranged coaxially, the sub-sleeve is located on the front side of the main sleeve, the first glass capillary is assembled on the sub-sleeve, the second glass capillary is assembled on the main sleeve, the sub-sleeve has a first observation slot, and the main sleeve has a second observation slot.

[0019] Preferably, the shell includes a main shell, a front sealing cover, a rear sealing cover and a fixing ring, the front sealing cover is assembled at the front end of the main shell, the rear sealing cover is assembled at the rear end of the main shell, the fixing ring is threadedly connected to the rear sealing cover, the rear end of the fixing ring has a gradient groove, the sleeve has a boss, and the gradient groove and the boss are assembled in a stop manner along the front and rear directions.

[0020] Preferably, the main shell further has a water circulation channel.

[0021] Preferably, the front end of the front sealing cover is further equipped with a protective window and a pressing ring, the pressing ring is threadedly assembled with the front sealing cover, and the pressing ring presses the protective window along the front-to-back direction;

[0022] Alternatively, the front end of the front sealing cover is also equipped with a gas conversion head, the gas conversion head has a gas interface and an air cavity, the air cavity is connected to the inner cavity, the gas interface is connected to the air cavity, the gas conversion head is threadedly assembled with the front sealing cover, the front end of the gas conversion head is equipped with a protective window and a pressure ring, the pressure ring is threadedly assembled with the gas conversion head, and the pressure ring presses the protective window along the front-to-back direction.

[0023] Compared with the prior art, the laser-coupled optical fiber output head according to the embodiment of the present invention has the following advantages: a sleeve is inserted into the inner cavity of the shell, and the sleeve fixes and protects the first glass capillary, the second glass capillary and the optical fiber body; the optical fiber body is inserted into the first glass capillary and the second glass capillary; since the diameter of the first inlet of the first fixing section is greater than the diameter of the optical fiber cladding, the diameter of the first outlet is greater than the core layer and less than or equal to the diameter of the optical fiber cladding, and the diameter of the second inlet of the second fixing section is greater than the diameter of the coating layer, and the diameter of the second outlet is greater than the diameter of the optical fiber cladding and less than the diameter of the coating layer, the optical fiber body is inserted into the first glass capillary and the second glass capillary. When inserted, the coating layer of the optical fiber body is clamped and fixed by the second outlet of the second fixing section, and the optical fiber cladding is clamped and fixed by the first outlet of the first fixing section, thereby fixing the optical fiber body. The optical fiber body is fixed by the first fixing section of the first glass capillary and the second fixing section of the second glass capillary, without the need for glue or soldering. When the optical fiber body is damaged, it can be quickly pulled out. In addition, because the optical fiber body is suspended between the first inlet and the first outlet, when the outer shell, the sleeve, and the first glass capillary expand due to heat, the suspended gap provides expansion space. The expansion structure will not pull the optical fiber body, thereby avoiding deformation of the optical fiber body and ensuring the coupling efficiency of the optical fiber body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a cross-sectional view of the structure of the laser-coupled optical fiber output head of the present invention;

[0025] Figure 2 yes Figure 1 Exploded diagram of the laser-coupled fiber output head;

[0026] Figure 3 This is a schematic structural diagram of the main housing of the laser-coupled optical fiber output head of the present invention;

[0027] Figure 4 yes Figure 1 A magnified schematic diagram of the local structure at the circle of the laser-coupled fiber output head;

[0028] Figure 5 This is a schematic diagram of the assembly structure of the sleeve, the first glass capillary, the second glass capillary and the optical fiber body of the laser-coupled optical fiber output head of the present invention;

[0029] Figure 6 yes Figure 5 An enlarged schematic diagram of the local structure at the first glass capillary;

[0030] Figure 7 yes Figure 5 An enlarged schematic diagram of the local structure at the second glass capillary;

[0031] Figure 8It is a structural schematic diagram of the magnetic base of the laser-coupled optical fiber output head of the present invention;

[0032] Figure 9 This is a schematic diagram of the three-dimensional structure of the main shell of the laser-coupled optical fiber output head of the present invention after the gas conversion head is assembled;

[0033] Figure 10 yes Figure 9 A partial cross-sectional view of the gas conversion head and the main housing of the laser-coupled fiber output head;

[0034] Figure 11 It is a schematic diagram of the state when the optical fiber body of the laser coupling optical fiber output head of the present invention is pulled out.

[0035] In the figure, 1. main shell, 11. front sealing cover, 12. protective window, 13. pressure ring, 14. rear sealing cover, 15. fixing ring, 151. gradient card slot, 16. inner cavity, 17. water circulation channel, 2. main sleeve, 21. auxiliary sleeve, 211. first observation slot, 22. first glass capillary, 221. first fixed section, 23. second glass capillary, 231. second fixed section, 24. boss, 25. second observation slot, 3. magnetic pressure base, 31. magnetic pressure cover, 311. gasket, 312. upper magnetic slot, 32. gasket, 33. magnetic pressure sheath, 34. hose, 35. V-groove, 36. lower magnetic slot, 4. optical fiber body, 41. coating layer, 42. optical fiber cladding, 5. gas conversion head, 51. pressure ring, 52. protective window, 53. gas interface, 54. gas cavity. DETAILED DESCRIPTION

[0036] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0037] A preferred embodiment of a laser-coupled optical fiber output head of the present invention is as follows: Figures 1 to 11 As shown, the laser-coupled optical fiber output head includes a housing, a sleeve, a first glass capillary 22, a second glass capillary 23 and an optical fiber body 4. The sleeve, the first glass capillary 22 and the second glass capillary 23 are all assembled in the housing.

[0038] The housing is a straight cylindrical structure that can be directly fixed to a conventional bracket or optical adjustment bracket without the need for a special female connector, simplifying the fixed assembly structure of the laser-coupled fiber output head and the bracket. The housing has an inner cavity 16 extending in the front-to-back direction, which runs through the front and back ends of the housing. The front-to-back direction is the axial direction of the housing. In this embodiment, the cross-section of the inner cavity 16 is circular to accommodate the cannula. The cannula is inserted into the inner cavity 16 of the housing in the front-to-back direction and is used to secure the first glass capillary 22 and the second glass capillary 23.

[0039] The first and second glass capillaries 22, 23 are inserted into the sleeve at intervals along the front-to-back direction. The first capillary 22 is located in front of the second capillary. The optical fiber 4 is inserted into the housing from back to front, achieving laser coupling at the front end. In this embodiment, the first and second glass capillaries 22, 23 are secured to the sleeve using hexagon socket screws. The first capillary 22 is used to position the end face of the optical fiber 4, while the second capillary 23 is used to position the coating 41 of the optical fiber 4.

[0040] The optical fiber body 4 is installed in the first glass capillary 22 and the second glass capillary 23 along the front-to-back direction. The optical fiber body 4 includes a core layer, a fiber cladding 42, and a coating layer 41. The fiber cladding 42 is coated on the outside of the core layer, and the coating layer 41 is coated on the outside of the fiber cladding 42. The core layer has a hollow structure, and the fiber cladding 42 is the portion of the optical fiber body 4 that is exposed after the coating layer 41 is stripped off. The diameter of the coating layer 41 is larger than that of the fiber cladding 42, and the diameter of the fiber cladding 42 is larger than that of the core layer. The fiber end face is the plane exposed after the fiber cladding 42 is cut, and the fiber end face also serves as the coupling surface after the laser is focused.

[0041] The first glass capillary tube 22 has a first fixing section 221. In this embodiment, the first fixing section 221 is located at the front end of the first glass capillary tube 22, close to the end face of the optical fiber body 4, to ensure accurate positioning of the optical fiber end face. The first fixing section 221 has a first outlet at the front end and a first inlet at the rear end. When installed in the first glass capillary tube 22, the optical fiber body 4 is inserted from the first inlet to the first outlet.

[0042] The diameter of the first inlet is larger than the diameter of the optical fiber cladding 42, while the diameter of the first outlet is larger than the diameter of the fiber core layer and smaller than or equal to the diameter of the optical fiber cladding 42. When the optical fiber body 4 is assembled into the laser coupling optical fiber output head, a section of the front end of the optical fiber body 4 is stripped of the coating 41 and the optical fiber cladding 42 is exposed. This section is installed in the first glass capillary 22 during assembly.

[0043] Since the diameter of the first inlet is larger than the diameter of the optical fiber cladding 42, the optical fiber cladding 42 can directly enter the first glass capillary 22 from the first inlet. Since the diameter of the first outlet is larger than the diameter of the fiber core layer and smaller than or equal to the diameter of the optical fiber cladding 42, when the optical fiber body 4 passes through the first outlet, the optical fiber cladding 42 of the optical fiber body 4 will be radially squeezed at the first outlet. The first glass capillary 22 is used to fix the optical fiber body 4 and also to position the optical fiber end face.

[0044] Specifically, taking the specifications of the core layer, optical fiber cladding 42, and coating layer 41 of the optical fiber body 4 as 50, 400, and 500 μm respectively, the diameter of the first inlet is greater than 400 μm, and can be 410 μm, etc., while the diameter of the first outlet should be slightly smaller than or equal to the diameter of the optical fiber cladding 42, and the difference can be within 10 μm, such as 398 μm, 395 μm, 390 μm, etc.

[0045] The inner diameter of the first fixing section 221 increases and then decreases from the first inlet to the first outlet, allowing the optical fiber 4 to remain suspended between the first inlet and the first outlet. Because the diameter of the first inlet is already greater than the diameter of the optical fiber cladding 42, the inner diameter of the first fixing section 221 gradually increases from the first inlet to the middle region of the first fixing section 221, ultimately exceeding the diameter of the optical fiber cladding 42. The inner diameter of the first fixing section 221 between the middle region and the first outlet is greater than the diameter of the optical fiber cladding 42, creating a gap between the inner wall of the first fixing section 221 and the optical fiber 4, causing the optical fiber 4 to remain suspended. With the optical fiber 4 suspended between the inner wall of the first fixing section 221, thermal expansion of the outer shell and the first glass capillary 22 prevents compression or tension on the optical fiber 4, thus preventing deformation of the optical fiber 4 and affecting coupling efficiency.

[0046] The second glass capillary 23 has a second fixing section 231 with a second outlet at the front end and a second inlet at the rear end. When installed in the second glass capillary 23, the optical fiber 4 is inserted from the second inlet to the second outlet. In this embodiment, the second fixing section 231 is located at the rear end of the second glass capillary 23, away from the end face of the optical fiber 4, to secure the coating 41 of the optical fiber 4 in place.

[0047] The diameter of the second inlet is larger than the diameter of the coating 41, while the diameter of the second outlet is larger than the diameter of the fiber cladding 42 but smaller than the diameter of the coating 41. When the optical fiber 4 is assembled into the laser-coupled fiber output connector, the portion with the cladding is located within the second fixing section 231. Because the diameter of the second inlet is larger than the diameter of the coating 41, the optical fiber 4 can pass through the second inlet easily. Since the diameter of the second outlet is smaller than the diameter of the coating 41, after the optical fiber 4 passes through the second fixing section 231, the second outlet radially compresses the coating 41 of the optical fiber 4, limiting and fixing the coating 41 of the optical fiber 4, and the second glass capillary 23 is used to fix the optical fiber 4.

[0048] Specifically, taking the core layer, optical fiber cladding 42, and coating layer 41 of the optical fiber body 4 as examples, the specifications are 50, 400, and 550 μm respectively. The diameter of the second inlet is greater than 550 μm, and the difference can be within 10 μm, such as 551 μm, 555 μm, 558 μm, etc. The diameter of the second outlet is greater than 400 μm and less than 550 μm, for example, it can be 420 μm, 450 μm, 480 μm, etc.

[0049] A sleeve is inserted into the inner cavity 16 of the shell of the laser coupling optical fiber output head, and the sleeve fixes and protects the first glass capillary 22, the second glass capillary 23 and the optical fiber body 4. The optical fiber body 4 is inserted into the first glass capillary 22 and the second glass capillary 23. Since the diameter of the first inlet of the first fixing section 221 is greater than the diameter of the optical fiber cladding 42, the diameter of the first outlet is greater than the core layer and less than or equal to the diameter of the optical fiber cladding 42, and the diameter of the second inlet of the second fixing section 231 is greater than the diameter of the coating layer 41, and the diameter of the second outlet is greater than the diameter of the optical fiber cladding 42 and less than the diameter of the coating layer 41, when the optical fiber body 4 is inserted into the first glass capillary 22 and the second glass capillary 23, the diameter of the optical fiber body 4 is greater than the diameter of the optical fiber cladding 42. The coating layer 41 is clamped and fixed by the second outlet of the second fixing section 231, and the optical fiber cladding 42 is clamped and fixed by the first outlet of the first fixing section 221, thereby fixing the optical fiber body 4. The optical fiber body 4 is fixed by the first fixing section 221 of the first glass capillary 22 and the second fixing section 231 of the second glass capillary 23, without the need for glue or soldering. When the optical fiber body 4 is damaged, it can be quickly pulled out; in addition, since the optical fiber body 4 is suspended between the first inlet and the first outlet, when the outer shell, sleeve, and first glass capillary 22 expand due to heat, the suspended gap provides expansion space, and the expansion structure will not pull the optical fiber body 4, thereby avoiding deformation of the optical fiber body 4 and ensuring the coupling efficiency of the optical fiber body 4.

[0050] Preferably, the inner wall surface of the first fixing section 221 is a curved surface structure along the first inlet to the first outlet.

[0051] The curved surface structure ensures a smooth transition between the inner wall of the first fixing section 221 and the first outlet. In this embodiment, the inner wall of the first fixing section 221 has a curved conical structure. The curvature of the curved conical structure changes more sharply near the first inlet and first outlet, and changes less sharply in the middle region of the first fixing section 221, ensuring that the optical fiber body 4 remains suspended. In other embodiments, the first fixing section 221 may also have a spindle-shaped structure.

[0052] Preferably, the inner wall surface of the second fixing section 231 is a conical structure along the second inlet to the second outlet.

[0053] The inner wall surface of the second fixing section 231 is a conical structure, which has a guiding function. While fixing the coating layer 41 of the optical fiber body 4, it facilitates the optical fiber body 4 to penetrate the second fixing section 231 of the second glass capillary 23, and the optical fiber body 4 can be pulled out quickly.

[0054] Preferably, it also includes a magnetic base, which includes a magnetic pressure base 3 and a magnetic pressure cover 31. The magnetic pressure base 3 and the outer shell can be detachably assembled. The magnetic pressure cover 31 and the magnetic pressure base 3 are fixed by magnetic attraction along the radial direction of the optical fiber body 4. The side of the magnetic pressure base 3 close to the magnetic pressure cover 31 has a V-shaped groove 35 extending along the front-to-back direction. The V-shaped groove 35 is used to assemble the optical fiber body 4.

[0055] The magnetic base is assembled at the rear end of the housing. In this embodiment, the side of the magnetic pressure base 3 is fixed to the sleeve via two sets of fastening screws. Specifically, the rear end of the sleeve is inserted into the magnetic pressure base 3, allowing the magnetic pressure base 3 to be assembled with the sleeve via the fastening screws. A V-shaped groove 35 is defined in the magnetic pressure base 3. This groove is used to accommodate the optical fiber body 4, preventing it from protruding too far beyond the magnetic pressure base 3 and controlling the force between the optical fiber body 4 and the magnetic pressure cover 31.

[0056] The magnetic pressure cover 31 is fixed to the magnetic pressure base 3 by magnetic attraction. In this embodiment, a lower magnetic groove 36 is provided on the side of the magnetic pressure base 3 close to the magnetic pressure cover 31, and an upper magnetic groove 312 is provided on the side of the magnetic pressure cover 31 close to the magnetic pressure base 3. Magnetic blocks are installed in the upper magnetic groove 312 and the lower magnetic groove 36, and the magnetic pressure base 3 and the magnetic pressure cover 31 are fixed by magnetic attraction through the magnetic blocks. After the magnetic pressure cover 31 and the magnetic pressure base 3 are magnetically fixed, the magnetic pressure cover 31 can squeeze the optical fiber body 4 along the radial direction of the optical fiber body 4 to fix the optical fiber body 4. At the same time, the magnetic pressure cover 31 and the magnetic pressure base 3 are fixed by magnetic attraction, and the magnetic attraction is a quick-release structure. When the optical fiber body 4 is damaged, the optical fiber body 4 can be quickly pulled out after the magnetic pressure cover 31 is removed.

[0057] The optical fiber body 4 is secured using a dual-layer method using a magnetic base, a first glass capillary 22, and a second glass capillary 23. This glue-free design ensures a secure seal while allowing for rapid disassembly. This rapid disassembly feature primarily addresses the issue of laser damage to the coupled end face during fiber coupling, which can occur due to high energy density at the focused spot. Rapid analysis of the damage location is essential. If the damage is to the fiber, the damaged area can be quickly removed and reattached.

[0058] Preferably, the magnetic base further includes a pad 32 , and a pad groove 311 is formed on a side of the magnetic pressure cover 31 close to the magnetic pressure base 3 , and the pad 32 is assembled in the pad groove 311 .

[0059] The pad groove 311 on the magnetic pressure cover 31 is used to install the pad 32. The pad 32 is a soft structure. After the pad 32 is embedded in the pad groove 311, it is used to magnetically press the protective pad of the optical fiber body 4 to prevent the surface of the optical fiber from being damaged due to magnetic pressure.

[0060] Preferably, the magnetic base also includes a magnetic pressure sheath 33 and a hose 34. The magnetic pressure sheath 33 is mounted on the outside of the magnetic pressure base 3 and the magnetic pressure cover 31. The magnetic pressure sheath 33 is fixedly assembled with the magnetic pressure base 3. The hose 34 is assembled at the rear end of the magnetic pressure sheath 33. The optical fiber body 4 is passed through the hose 34.

[0061] The magnetic pressure sheath 33 is assembled at the rear end of the magnetic pressure base 3. It is used to clamp the magnetic pressure cover 31 on the magnetic pressure base 3, preventing it from falling off. It also serves as a protective sheath for the optical fiber body 4. A magnetic pressure hose 34 is connected to the rear end of the magnetic pressure sheath 33, forming a protective sheath for the optical fiber body 4. In this embodiment, the magnetic pressure sheath 33 is fixed to the magnetic pressure base 3 using flat head screws, and the hose 34 is fixed to the magnetic pressure sheath 33 using hexagon socket set screws.

[0062] Preferably, the sleeve includes a coaxially arranged main sleeve 2 and a secondary sleeve 21, the secondary sleeve 21 is located on the front side of the main sleeve 2, the first glass capillary 22 is assembled on the secondary sleeve 21, the second glass capillary 23 is assembled on the main sleeve 2, the secondary sleeve 21 has a first observation slot 211, and the main sleeve 2 has a second observation slot 25.

[0063] The main sleeve 2 is longer than the auxiliary sleeve 21. A first glass capillary tube 22 is mounted within the auxiliary sleeve 21, and a second glass capillary tube 23 is mounted within the auxiliary sleeve 21. A distance is provided between the first and second glass capillary tubes 22, 23 in the front-to-back direction. The sleeve, comprised of the main sleeve 2 and the auxiliary sleeve 21, facilitates assembly of the first and second glass capillary tubes 22, 23. In this embodiment, the front end of the main sleeve 2 has external threads, while the rear end of the auxiliary sleeve 21 has internal threads, providing a threaded assembly between the main sleeve 2 and the auxiliary sleeve 21.

[0064] The secondary sleeve 21 has a first observation groove 211. When the optical fiber body 4 is encapsulated, the penetration of the optical fiber cladding 42 located in the first glass capillary 22 can be observed through the first observation groove 211 to avoid collision with the end face of the optical fiber body 4. At the same time, before the optical fiber body 4 is disassembled, the damage of the optical fiber cladding 42 can be judged.

[0065] The main sleeve 2 has a second observation groove 25. When the optical fiber body 4 is encapsulated, the position of the coating layer 41 of the optical fiber body 4 can be observed through the second observation groove 25 to ensure that the coating layer 41 is aligned with the second outlet of the second fixing section 231, so that the coating layer 41 of the optical fiber body 4 is fixed; at the same time, before the optical fiber body 4 is disassembled, the damage condition of the coating layer 41 can be judged.

[0066] When the optical fiber body 4 is damaged, the first glass capillary 22, the second glass capillary 23 and the optical fiber body 4 can be pulled out simultaneously after the sleeve is pulled out. By analyzing the optical fiber end face and the first observation groove 211 and the second observation groove 25, it can be confirmed that the damage location of the optical fiber body 4 is at the optical fiber end face, the optical fiber cladding 42 or the coating layer 41.

[0067] Preferably, the shell includes a main shell 1, a front sealing cover 11, a rear sealing cover 14 and a fixing ring 15. The front sealing cover 11 is assembled at the front end of the main shell 1, and the rear sealing cover 14 is assembled at the rear end of the main shell 1. The fixing ring 15 is threadedly connected to the rear sealing cover 14. The rear end of the fixing ring 15 has a gradient groove 151, and the sleeve has a boss 24. The gradient groove 151 and the boss 24 are assembled in a stop manner along the front and rear directions.

[0068] The front sealing cover 11 is fixedly assembled on the front end of the main shell 1 by cup head screws, and the joint surface between the front sealing cover 11 and the main shell 1 is compressed and sealed by an O-ring; the rear sealing cover 14 is fixedly assembled on the rear end of the main shell 1 by cup head screws, and the joint surface between the rear sealing cover 14 and the main shell 1 is compressed and sealed by an O-ring. The front sealing cover 11 and the rear sealing cover 14 are used to seal the water circulation channel 17 in the main shell 1. At the same time, the rear sealing cover 14 also serves as a fixing bracket for the fixing ring 15.

[0069] The retaining ring 15 has external threads, and the rear end of the rear sealing cover 14 has internal threads. The retaining ring 15 and the rear sealing cover 14 are threaded together, and the interface between the retaining ring 15 and the rear sealing cover 14 is compressed and sealed by an O-ring. The retaining ring 15 also serves as a fixing bracket for the sleeve. The side of the retaining ring 15 is locked to the sleeve with a hexagon socket screw.

[0070] The sleeve has a boss 24, and the rear end of the retaining ring 15 has a gradient groove 151. When the sleeve is inserted into the main housing 1 from back to front, the boss 24 and the gradient groove 151 abut against each other, limiting the sleeve's position. In this embodiment, the boss 24 is located at the rear end of the main sleeve 2, and the boss 24 and the gradient groove 151 provide one-way positional restraint. After the magnetic pressure base 3 is secured to the main sleeve 2, the front end of the magnetic pressure base 3 abuts the rear end of the boss 24. The magnetic pressure base 3 and the retaining ring 15 cooperate to limit the main sleeve 2 in both the front and rear directions, preventing the sleeve from moving.

[0071] Preferably, a water circulation channel 17 is further provided in the main housing 1 .

[0072] Cooling water can flow through the water circulation channel 17 to reduce the operating temperature of the main housing 1. In this embodiment, the water circulation channel 17 has 14 channels, with a total of 7 cycles, to increase the cooling water contact area and the number of cycles, thereby reducing the thermal effects of the laser. In other embodiments, the number of water circulation channels 17 and the number of cycles can be determined as needed.

[0073] Preferably, the front end of the front sealing cover 11 is further equipped with a protective window sheet 12 and a pressing ring 13, the pressing ring 13 is threadedly assembled with the front sealing cover 11, and the pressing ring 13 presses the protective window sheet 12 along the front-to-back direction;

[0074] Alternatively, the front end of the front sealing cover 11 is also equipped with a gas conversion head 5, the gas conversion head 5 has a gas interface 53 and an air cavity 54, the air cavity 54 is connected to the inner cavity 16, the gas interface 53 is connected to the air cavity 54, the gas conversion head 5 is threadedly assembled with the front sealing cover 11, and the front end of the gas conversion head 5 is equipped with a protective window 52 and a pressure ring 51, the pressure ring 51 is threadedly assembled with the gas conversion head 5, and the pressure ring 51 presses the protective window 52 along the front-to-back direction.

[0075] The front end of the front sealing cover 11 is directly assembled with a protective window 12 and a pressure ring 13. The front end of the airtight sealing cover has an internal threaded opening, into which the protective window 12 is assembled. The pressure ring 13 is threadedly assembled with the internal threaded opening at the front end of the airtight sealing cover, pressing the protective window 12. The protective window 12 is attached to the front sealing cover 11 and sealed with an O-ring to provide dustproof sealing and laser protection. In this embodiment, the inner and outer surfaces of the protective window 12 are coated with a high-damage anti-reflection coating (the wavelength is determined according to requirements) to improve the output efficiency and power of the laser.

[0076] The front end of the front sealing cover 11 is equipped with a gas conversion head 5. After removing the protective window 12 and the pressure ring 13 directly assembled on the front sealing cover 11 at the same time, the gas conversion head 5 can be externally connected. The gas interface 53 and the air cavity 54 on the gas conversion head 5 are connected to the inner cavity 16 in the outer shell. The gas interface 53 is a universal interface for external pipelines. By pumping air or injecting gas through the gas interface 53 on the gas conversion head 5, vacuum or inert gas filling can be achieved in the inner cavity 16 of the outer shell, thereby achieving the purpose of internal gas filling / vacuum and meeting different application requirements.

[0077] The front end of the gas conversion head 5 has an internally threaded opening, into which a protective window 52 is mounted. A pressure ring 51 is screwed onto the internally threaded opening, compressing the protective window 52. The inner surface of the protective window 52 is in contact with the gas conversion head 5 and sealed with an O-ring for dustproof sealing and laser protection. In this embodiment, both the inner and outer surfaces of the protective window 52 are coated with a high-damage anti-reflection coating (the wavelength is determined by the requirements) to improve laser output efficiency and power.

[0078] In summary, the embodiment of the present invention provides a laser-coupled optical fiber output head, in which a sleeve is inserted into the inner cavity of the shell, and the sleeve fixes and protects the first glass capillary, the second glass capillary and the optical fiber body. The optical fiber body is inserted into the first glass capillary and the second glass capillary. Since the diameter of the first inlet of the first fixing section is greater than the diameter of the optical fiber cladding, the diameter of the first outlet is greater than the core layer and less than or equal to the diameter of the optical fiber cladding, and the diameter of the second inlet of the second fixing section is greater than the diameter of the coating layer, and the diameter of the second outlet is greater than the diameter of the optical fiber cladding and less than the diameter of the coating layer, when the optical fiber body is inserted into the first glass capillary and the second glass capillary, the optical fiber body is The coating layer of the fiber body is clamped and fixed by the second outlet of the second fixing section, and the fiber cladding is clamped and fixed by the first outlet of the first fixing section, thereby fixing the fiber body. The first fixing section of the first glass capillary and the second fixing section of the second glass capillary are used to fix the fiber body, without the need for glue or soldering. When the fiber body is damaged, it can be quickly pulled out. In addition, because the fiber body is suspended between the first inlet and the first outlet, when the housing, sleeve, and first glass capillary expand due to heat, the suspended gap provides expansion space, and the expansion structure will not pull the fiber body, thereby avoiding deformation of the fiber body and ensuring the coupling efficiency of the fiber body.

[0079] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A laser-coupled optical fiber output head, characterized in that: include: a housing having an inner cavity extending through the housing in a front-to-back direction; a cannula, the cannula being inserted into the inner cavity; a first glass capillary and a second glass capillary, wherein the first glass capillary and the second glass capillary are inserted into the sleeve along a front-to-back direction, and the first glass capillary is located in front of the second glass capillary; An optical fiber body, the optical fiber body being inserted into the first glass capillary and the second glass capillary, the optical fiber body comprising a core layer, an optical fiber cladding covering the outer side of the core layer, and a coating layer covering the outer side of the optical fiber cladding; The first glass capillary has a first fixed section, the first fixed section having a first outlet at a front end and a first inlet at a rear end, the diameter of the first inlet being larger than the diameter of the optical fiber cladding, the diameter of the first outlet being larger than the diameter of the fiber core layer and smaller than or equal to the diameter of the optical fiber cladding, and the inner diameter of the first fixed section first increases and then decreases from the first inlet to the first outlet so that the optical fiber body is suspended between the first inlet and the first outlet; The second glass capillary has a second fixed section, the second fixed section has a second outlet located at the front end and a second inlet located at the rear end, the diameter of the second inlet is larger than the diameter of the coating layer, and the diameter of the second outlet is larger than the diameter of the optical fiber cladding and smaller than the diameter of the coating layer.

2. The laser-coupled fiber output head according to claim 1, characterized in that: An inner wall surface of the first fixing section is a curved structure along the first inlet to the first outlet.

3. The laser-coupled fiber output head according to claim 2, characterized in that: An inner wall surface of the second fixing section is a conical structure along the second inlet to the second outlet.

4. The laser-coupled fiber output head according to any one of claims 1 to 3, characterized in that: It also includes a magnetic base, which includes a magnetic pressure base and a magnetic pressure cover. The magnetic pressure base and the outer shell are detachable and assembled. The magnetic pressure cover and the magnetic pressure base are fixed by magnetic attraction along the radial direction of the optical fiber body. The magnetic pressure base has a V-shaped groove extending in the front-to-back direction on one side close to the magnetic pressure cover, and the V-shaped groove is used to assemble the optical fiber body.

5. The laser-coupled optical fiber output head according to claim 4, characterized in that: The magnetic seat further comprises a pad, and a pad groove is provided on a side of the magnetic pressure cover close to the magnetic pressure base, and the pad is assembled in the pad groove.

6. The laser-coupled fiber output head according to claim 4, characterized in that: The magnetic seat also includes a magnetic pressure sheath and a hose. The magnetic pressure sheath is sleeved on the outside of the magnetic pressure base and the magnetic pressure cover. The magnetic pressure sheath is fixedly assembled with the magnetic pressure base. The hose is assembled at the rear end of the magnetic pressure sheath, and the optical fiber body is passed through the hose.

7. The laser-coupled fiber output head according to any one of claims 1 to 3, characterized in that: The sleeve includes a coaxially arranged main sleeve and a secondary sleeve, the secondary sleeve is located on the front side of the main sleeve, the first glass capillary is assembled on the secondary sleeve, the second glass capillary is assembled on the main sleeve, the secondary sleeve has a first observation slot, and the main sleeve has a second observation slot.

8. The laser-coupled fiber output head according to any one of claims 1 to 3, characterized in that: The shell includes a main shell, a front sealing cover, a rear sealing cover and a fixing ring. The front sealing cover is assembled at the front end of the main shell, and the rear sealing cover is assembled at the rear end of the main shell. The fixing ring is threadedly connected to the rear sealing cover. The rear end of the fixing ring has a gradient groove, and the sleeve has a boss. The gradient groove and the boss are assembled in a stop manner along the front and rear directions.

9. The laser-coupled optical fiber output head according to claim 8, characterized in that: The main shell also has a water circulation channel.

10. The laser-coupled optical fiber output head according to claim 8, characterized in that: The front end of the front sealing cover is also equipped with a protective window and a pressing ring, the pressing ring is threadedly assembled with the front sealing cover, and the pressing ring presses the protective window along the front-to-back direction; Alternatively, the front end of the front sealing cover is also equipped with a gas conversion head, the gas conversion head has a gas interface and an air cavity, the air cavity is connected to the inner cavity, the gas interface is connected to the air cavity, the gas conversion head is threadedly assembled with the front sealing cover, the front end of the gas conversion head is equipped with a protective window and a pressure ring, the pressure ring is threadedly assembled with the gas conversion head, and the pressure ring presses the protective window along the front-to-back direction.

Images