High-power optical fiber input end structure

Abstract

The utility model discloses a high-power optical fiber input end structure, which comprises an optical fiber seat, an end cap, a connecting optical fiber and a protective cover, one end of the connecting optical fiber is fixedly connected with the end cap, the other end of the connecting optical fiber can be fixedly connected with the transmission optical fiber through adhesive glue, a through containing cavity or containing groove is formed in the optical fiber base, the end cap is located at one end of the containing cavity or containing groove, and the transmission optical fiber can penetrate out of the other end of the containing cavity or containing groove; the protective cover is arranged on the connecting optical fiber in a sleeving mode and used for preventing light which leaks from the end cap and does not enter the connecting optical fiber from irradiating the adhesive glue, and the projection of the protective cover in the light direction covers the projection of the adhesive glue in the light direction. The high-power optical fiber input end structure can prevent light which leaks from the end cap and does not enter the connecting optical fiber from directly irradiating the adhesive glue, further prevents the adhesive glue from being melted and aged due to irradiation of laser light, and enables laser transmission to be more stable and reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical fibers, and particularly relates to a high-power optical fiber input end structure. Background Art

[0002] Laser fiber transmission is widely used in the field of laser processing. Compared with traditional space laser transmission, fiber transmission can achieve reliable long-distance flexible transmission and has greater flexibility. Before fiber transmission, the laser needs to be coupled into the transmission fiber, which requires the use of a fiber input end structure, that is, the fiber input end structure is connected to the input end of the transmission fiber, so that the laser enters the transmission fiber through the end cap and the connecting fiber in turn.

[0003] However, when the existing optical fiber input end structure is in use, as the use time increases, the laser optical fiber connection end ages rapidly, resulting in a shortened service life and poor laser transmission stability. Utility Model Content

[0004] The inventors of the present application discovered during research that, when assembling the existing optical fiber input end structure, the connecting optical fiber and the transmission optical fiber are connected and fixed by adhesive. In the process of coupling a high-power laser into the transmission optical fiber, the laser that leaks from the end cap and does not enter the connecting optical fiber will directly irradiate the adhesive. Long-term exposure will cause the adhesive to melt or age, affecting the stability of the connection between the connecting optical fiber and the transmission optical fiber, and further affecting laser transmission.

[0005] In view of the above problems, the utility model discloses a high-power optical fiber input end structure to overcome the above problems or at least partially solve the above problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model discloses a high-power optical fiber input end structure, comprising an optical fiber seat, an end cap, a connecting optical fiber and a protective cover;

[0008] One end of the connecting optical fiber is fixedly connected to the end cap, and the other end of the connecting optical fiber can be fixedly connected to the transmission optical fiber by adhesive, a through accommodating cavity or accommodating groove is formed in the optical fiber holder, the end cap is located at one end of the accommodating cavity or the accommodating groove, and the transmission optical fiber can pass through the other end of the accommodating cavity or the accommodating groove;

[0009] The protective cover is sleeved on the connecting optical fiber to block the light leaking from the end cap but not entering the connecting optical fiber from irradiating the adhesive, and the projection of the protective cover in the direction of the light covers the projection of the adhesive in the direction of the light.

[0010] Furthermore, the shape of the protective cover is one or more combinations of a disk, a cylinder, a truncated cone, a hemisphere and a cone.

[0011] Furthermore, the material of the protective cover is metal, glass or ceramic.

[0012] Furthermore, a reflective film is provided on the end surface of the protective cover close to the end cap or a concave structure is formed.

[0013] Furthermore, the inner wall of the recessed structure is sprayed with black light absorbing paint.

[0014] Furthermore, the protective cover is a porous structure.

[0015] Furthermore, a water cooling channel is formed in the protective cover, and the water cooling channel surrounds the circumference of the connecting optical fiber.

[0016] Furthermore, a roughened area is formed on the connecting optical fiber for stripping off the cladding light in the connecting optical fiber, and the protective cover is sleeved at the position of the roughened area.

[0017] Furthermore, a limiting groove or a limiting protrusion is opened on the inner wall of the accommodating cavity or the accommodating groove, and the protective cover is provided with a limiting protrusion or a limiting groove that cooperates with the limiting groove or the limiting protrusion, so as to prevent the protective cover from moving along the axial direction of the connecting optical fiber.

[0018] Furthermore, a support platform is formed in the accommodating cavity or the accommodating groove, and the support platform is used to support the adhesive.

[0019] The advantages and beneficial effects of the utility model are:

[0020] In the high-power optical fiber input end structure of the utility model, a protective cover is set on the connecting optical fiber, so that the protective cover is located between the end cap and the adhesive, which can block the light leaked from the end cap and not entering the connecting optical fiber from directly irradiating the adhesive, and the projection of the protective cover in the direction of the light covers the projection of the adhesive in the direction of the light, thereby effectively protecting the adhesive and preventing the adhesive from melting and aging due to laser irradiation, thereby increasing the stability of the connection between the high-power optical fiber input end structure and the transmission optical fiber, enabling the laser to be transmitted stably, and being more reliable and durable than the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0022] Figure 1 This is a three-dimensional structural diagram of a high-power optical fiber input end structure in one embodiment of the utility model;

[0023] Figure 2 This is a three-dimensional structural diagram of a high-power optical fiber input end structure cut along the axial direction of the connected optical fiber in one embodiment of the utility model;

[0024] Figure 3 This is a cross-sectional view of a high-power optical fiber input end structure along the axial direction of the connected optical fiber in one embodiment of the utility model;

[0025] Figure 4 for Figure 3 A partial enlarged view of the positional relationship between the middle protective cover and the adhesive;

[0026] Figure 5 This is a three-dimensional structural diagram of a high-power optical fiber input end structure in another embodiment of the utility model;

[0027] Figure 6 This is a three-dimensional structural diagram of a high-power optical fiber input end structure cut along the axial direction of the connected optical fiber in another embodiment of the utility model;

[0028] Figure 7 This is a partial structural diagram of a high-power optical fiber input end structure along the axial section of the connected optical fiber in another embodiment of the utility model.

[0029] In the figure: 1. Fiber optic holder; 2. End cap; 3. Connecting fiber optic; 4. Transmission fiber optic; 5. Protective cover; 6. Adhesive; 7. Light; 8. Groove; 9. Water cooling channel; 10. Roughening area; 11. Support platform; 12. Receiving groove. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] In one embodiment of the utility model, a high-power optical fiber input end structure is provided, such as Figures 1 to 4 As shown, the high-power optical fiber input end structure includes an optical fiber seat 1, an end cap 2, a connecting optical fiber 3 and a protective cover 5.

[0033] Specifically, one end of the connecting optical fiber 3 is fixedly connected to the end cap 2, and the other end of the connecting optical fiber 3 can be fixedly connected to the transmission optical fiber 4 through the adhesive 6, that is, when the high-power optical fiber input end structure is connected to the transmission optical fiber 4, the other end of the connecting optical fiber 3 is connected to the input end of the transmission optical fiber 4 through the adhesive 6, so that the laser can be coupled into the transmission optical fiber 4 through the end cap 2 and the connecting optical fiber 3 in sequence, thereby realizing the transmission of the laser; a through accommodating groove 12 ( Figure 1 and Figure 2 The end cap 2 is located at one end of the receiving groove 12, that is, part of the end cap 2 is embedded in the fiber optic holder 1, the connecting optical fiber 3 is located in the receiving groove 12, and the transmission optical fiber 4 passes through the other end of the receiving groove 12, and the end cap 2 and the connecting optical fiber 3 are supported and protected by the fiber optic holder 1; of course, the receiving groove 12 on the fiber optic holder 1 can also be replaced by a receiving cavity.

[0034] In addition, the protective cover 5 is sleeved on the connecting optical fiber 3, and the protective cover 5 can absorb and / or reflect the light 7 (laser light) leaking from the end cap 2 and not entering the connecting optical fiber 3, so that the light 7 cannot directly irradiate the adhesive 6, thereby protecting the adhesive 6; and the projection of the protective cover 5 in the direction of the light 7 covers the projection of the adhesive 6 in the direction of the light 7, which can completely prevent the light 7 from directly irradiating the adhesive 6. Since the optical fiber holder 1 is made of metal, the laser light reflected by the protective cover 5 will be absorbed by the optical fiber holder 1 and converted into heat and dissipated in the air.

[0035] In summary, in the high-power optical fiber input end structure of the present embodiment, a protective cover is provided on the connecting optical fiber so that the protective cover is located between the end cap and the adhesive. This can block the light leaking from the end cap that has not entered the connecting optical fiber from directly irradiating the adhesive, thereby effectively protecting the adhesive and preventing the adhesive from melting and aging due to laser irradiation. This increases the stability of the connection between the high-power optical fiber input end structure and the transmission optical fiber, allowing the laser to be transmitted stably, and is more reliable and durable than the prior art. In addition, the projection of the protective cover in the direction of the light covers the projection of the adhesive in the direction of the light, so that the adhesive is not exposed to the laser light at all.

[0036] In this embodiment, if Figures 1 to 4 As shown, the protective cover 5 is in the shape of a cone, and the tip of the cone faces the end cap 2, which can better reflect the laser light 7. Of course, in other embodiments, the shape of the protective cover 5 can be a disk, a cylinder, a truncated cone or a hemisphere, or the shape of the protective cover 5 can also be a combination of disks, cylinders, truncated cones, hemispheres and cones. For example, the shape of the protective cover 5 is a hemisphere, and the spherical surface of the hemisphere faces the end cap 2, so that the leaked laser light can be better reflected and / or absorbed; Figures 5 to 7As shown, the shape of the protective cover 5 is a combination of a cylinder and a cone, and the tip of the cone is also facing the end cap 2, and the cylinder is fixed to the bottom of the cone. In other embodiments, the protective cover 5 is a porous structure as a whole, for example, it can be a sponge-like structure, and the pores in the sponge structure can effectively absorb the laser light 7 to prevent the adhesive 6 from being irradiated by the laser light 7.

[0037] Furthermore, the material of the protective cover 5 is glass, and the excellent reflective performance of the glass enables most of the light 7 to be reflected away. In addition, in order to improve the reflection effect, a reflective film (not shown in the figure) can be provided on the end surface of the protective cover 5 close to the end cap 2, that is, a reflective film is attached or plated on the reflective surface of the protective cover 5 to enhance the reflective ability of the protective cover 5.

[0038] Of course, the material of the protection cover 5 can also be metal, glass or ceramic, or other heat-resistant and aging-resistant materials.

[0039] In other embodiments, when the material of the protective cover 5 is a material with light absorbing properties such as metal, a recessed structure may be provided on the end surface of the protective cover 5 close to the end cap 2. The recessed structure may be a groove or a pit, and the number of the grooves or pits may be more than one. Figure 7 A plurality of grooves 8 are provided, that is, grooves 8 are provided on the absorption surface of the end cap 2, and the absorption of the laser light 7 is increased by the grooves 8, so that the light energy is converted into heat energy as much as possible. Furthermore, the inner wall of the groove 8 is sprayed with a light-absorbing paint, for example, a black light-absorbing paint, so that the laser light 7 entering the groove 8 can be completely absorbed.

[0040] And, if Figure 7 As shown, a water cooling channel 9 is formed in the protective cover 5, and the water cooling channel 9 surrounds the circumference of the connected optical fiber 3. The heat converted by the laser light 7 can be taken away by the coolant in the water cooling channel 9, ensuring that the high-power optical fiber input end structure can work continuously and stably.

[0041] In addition, if Figure 6 and Figure 7 As shown, a roughened area 10 is formed on the connecting optical fiber 3 for stripping the cladding light in the connecting optical fiber 3, and the protective cover 5 is sleeved at the position of the roughened area 10. In this way, the stripped cladding light can be absorbed by the protective cover 5, and the heat converted from the cladding light can also be taken away by the cooling liquid in the water cooling channel 9, thereby improving the quality of the transmitted laser.

[0042] Of course, in other embodiments, the water cooling channel 9 in the protective cover 5 may also be in a double helix structure, spiraling around the circumference of the connected optical fiber 3, so that the coolant in the water cooling channel 9 can fully absorb the heat converted from the cladding light.

[0043] In this embodiment, if Figure 1 and Figure 2 As shown, a support platform 11 is formed in the receiving groove 12, and the support platform 11 is used to support the adhesive 6 to prevent the connecting optical fiber 3 and the transmission optical fiber 4 from breaking.

[0044] In addition, a limiting groove (not shown in the figure) is opened on the inner wall of the accommodating groove, and a limiting protrusion (not shown in the figure) cooperating with the limiting groove is provided on the protective cover 5 to prevent the protective cover 5 from moving along the axial direction of the connected optical fiber 3, thereby realizing the positioning of the protective cover 5 and further improving the stability of the high-power optical fiber input end structure.

[0045] In a specific embodiment of the present invention, Figures 1 to 4 As shown, the protective cover 5 is in the shape of a cone, the bottom diameter of the cone is 3.6 mm, the height of the cone is 1.8 mm, the end cap 2 is a quartz cylinder, the diameter of the cylinder is 5 mm, the height of the cylinder is 5 mm, the diameter of the connecting optical fiber 3 is 0.4 mm, and the protective cover 5 is sleeved on the connecting optical fiber 3 at a position 3 mm away from the adhesive 6. The high-power optical fiber input end structure can realize high-power laser transmission and has better working stability.

[0046] The above description is only a specific implementation of the present invention. Under the above teaching of the present invention, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of the present invention, and the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A high-power optical fiber input end structure, characterized in that: Includes optical fiber holder, end cap, connecting optical fiber and protective cover; One end of the connecting optical fiber is fixedly connected to the end cap, and the other end of the connecting optical fiber can be fixedly connected to the transmission optical fiber by adhesive, a through accommodating cavity or accommodating groove is formed in the optical fiber holder, the end cap is located at one end of the accommodating cavity or the accommodating groove, and the transmission optical fiber can pass through the other end of the accommodating cavity or the accommodating groove; The protective cover is sleeved on the connecting optical fiber to block the light leaking from the end cap but not entering the connecting optical fiber from irradiating the adhesive, and the projection of the protective cover in the direction of the light covers the projection of the adhesive in the direction of the light.

2. The high-power optical fiber input end structure according to claim 1, characterized in that: The shape of the protective cover is one or more combinations of a disk, a cylinder, a truncated cone, a hemisphere and a cone.

3. The high-power optical fiber input end structure according to claim 2, characterized in that: The material of the protective cover is metal, glass or ceramic.

4. The high-power optical fiber input end structure according to claim 2, characterized in that: The end surface of the protective cover close to the end cap is provided with a reflective film or formed with a concave structure.

5. The high-power optical fiber input end structure according to claim 4, characterized in that: The inner wall of the recessed structure is sprayed with light absorbing paint.

6. The high-power optical fiber input end structure according to claim 1, characterized in that: The protective cover is a porous structure.

7. The high-power optical fiber input end structure according to claim 1, characterized in that: A water cooling channel is formed in the protective cover, and the water cooling channel surrounds the circumference of the connecting optical fiber.

8. The high-power optical fiber input end structure according to claim 7, characterized in that: A roughened area is formed on the connecting optical fiber for stripping off the cladding light in the connecting optical fiber, and the protective cover is sleeved at the position of the roughened area.

9. The high-power optical fiber input end structure according to claim 1, characterized in that: A limiting groove or a limiting protrusion is formed on the inner wall of the accommodating cavity or the accommodating groove, and a limiting protrusion or a limiting groove cooperating with the limiting groove or the limiting protrusion is provided on the protective cover to prevent the protective cover from moving along the axial direction of the connecting optical fiber.

10. The high-power optical fiber input end structure according to any one of claims 1 to 9, characterized in that: A support platform is formed in the accommodating cavity or the accommodating groove, and the support platform is used to support the adhesive.

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