Optical fiber coupling device

Abstract

The utility model discloses an optical fiber coupling device, which belongs to the technical field of lasers and comprises a base, a laser body and an optical fiber body, and the laser body and the optical fiber body are respectively positioned at two ends of the base. The end, close to the laser body, of the base is fixedly connected with a magnetic lens support through two screws, the middle of the magnetic lens support is connected with a sleeve in a penetrating mode, one end of the sleeve extends to the inner side of the base, and a lens cone is arranged on the inner side of the sleeve and fixed through a jackscrew. A lens is fixedly installed at the end, close to the laser body, of the lens cone, an optical fiber flange is connected to the end, close to the optical fiber body, of the base in a penetrating mode, a magnetic attraction type hard connection structure can be adopted, and high mechanical stability can be guaranteed while multi-dimensional adjustment can be met; and the problems of output power reduction, light spot deterioration and the like caused by the deflection phenomenon of the lens in the transportation and use processes are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lasers, and more specifically to an optical fiber coupling device. Background Art

[0002] At present, in the field of lasers, some special bands and lasers with certain performance requirements cannot be generated by fiber lasers, but in practical applications, many require fiber output, so it is necessary to use a fiber coupling device to couple the laser beam in space into the optical fiber to achieve fiber output. The commonly used fiber coupling device is generally composed of a multi-dimensional adjustable mirror frame and a lens. The multi-dimensional adjustable mirror frame is generally a tension spring structure. The multi-dimensional adjustable mirror frame of this structure generally has poor mechanical vibration resistance. The lens is prone to misalignment during the transportation and use of the laser. The optical fiber is extremely sensitive to the incident angle and position. Once the lens is misaligned, it will cause problems such as a decrease in output power and a deterioration of the light spot. Another fiber coupling device is composed of a fixed mirror frame and one or more lenses. It has high mechanical stability, but the position of the lens is usually not adjustable. Therefore, in view of this, the existing structure is studied and improved to provide a fiber coupling device in order to achieve a more practical purpose. Utility Model Content

[0003] 1. Technical issues to be solved

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a fiber optic coupling device, which can adopt a magnetic hard connection structure, can meet the multi-dimensional adjustability while ensuring high mechanical stability, and avoid the problem of lens deflection during transportation and use, resulting in reduced output power and worse light spot.

[0005] 2. Technical solution

[0006] To solve the above problems, the utility model adopts the following technical solutions.

[0007] A fiber coupling device comprises a base, a laser body and a fiber body, wherein the laser body and the fiber body are respectively located at two end positions of the base, and one end of the base close to the laser body is fixedly connected to a magnetic lens bracket by two screws, a sleeve is connected through the middle of the magnetic lens bracket, and one end of the sleeve extends to the inner side of the base, a lens barrel is arranged on the inner side of the sleeve and fixed by a top screw, a lens is fixedly installed on one end of the lens barrel close to the laser body, and one end of the base close to the fiber body is connected through the end of the base to be fixed to the fiber flange, and the fiber body is fixedly connected to one end of the fiber flange.

[0008] Furthermore, a plurality of magnets are embedded on one side of the magnetic lens holder close to the base, and the magnetic lens holder is fixed to the base by magnetic attraction through the magnets.

[0009] Furthermore, the magnetic lens bracket is provided with two through holes, and screws pass through the corresponding through holes to fix the magnetic lens bracket on the base.

[0010] Furthermore, the diameter of the through hole is larger than the diameter of the screw.

[0011] Furthermore, the top screw is threadedly connected to the top of the magnetic lens bracket, and the bottom end of the top screw extends to the inside of the sleeve and abuts against the top of the lens barrel.

[0012] Furthermore, the laser body is a helium-neon laser, the lens is a spherical lens, and the surface is coated with an anti-reflection film.

[0013] Furthermore, the laser body is an ultraviolet solid laser, the lens is an aspherical lens, and the surface is coated with an anti-reflection film.

[0014] 3. Beneficial effects

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] (1) This solution uses a hard connection between the lens, the magnetic lens holder and the base. With the cooperation of the magnet, the overall structure does not have soft connections such as traditional tension springs, thereby improving the overall structure's resistance to mechanical vibration. This avoids problems such as a decrease in output power and a deterioration in light spot caused by the lens becoming misaligned during transportation and use, greatly improving its stability in use.

[0017] (2) In this solution, the magnetic lens bracket and the base are connected by magnets during the adjustment process, so that the position of the lens is not easy to deviate during the debugging process. At the same time, the sleeve, the lens barrel and the top screw are used in combination to enable the lens to be adjusted in the X direction. The screws and through holes are used in combination to facilitate the adjustment of the lens in the Y and Z directions. The adjustment operation is convenient and quick, and the lens can be adjusted in multiple dimensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the position structure of the magnetic lens bracket of the utility model;

[0020] Figure 3 This is a schematic diagram of the overall structure of the first embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the overall structure of the second embodiment of the present utility model.

[0022] Description of the numbers in the figure:

[0023] 1. Base;

[0024] 2. Laser body;

[0025] 3. Optical fiber body;

[0026] 4. Screws;

[0027] 5. Magnetic lens holder;

[0028] 6. Sleeve;

[0029] 7. Lens tube;

[0030] 8. Top screw;

[0031] 9. Lenses;

[0032] 10. Fiber optic flange;

[0033] 11. Magnet;

[0034] 12. Through hole. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0036] Embodiment 1:

[0037] See also Figure 1-3 A fiber coupling device comprises a base 1, a laser body 2 and a fiber body 3. The laser body 2 and the fiber body 3 are respectively located at two ends of the base 1. One end of the base 1 close to the laser body 2 is fixedly connected to a magnetic lens holder 5 by two screws 4. A sleeve 6 is connected through the middle of the magnetic lens holder 5, and one end of the sleeve 6 extends to the inner side of the base 1. A lens barrel 7 is arranged on the inner side of the sleeve 6 and fixed by a top screw 8. A lens 9 is fixedly installed on the end of the lens barrel 7 close to the laser body 2. An end of the base 1 close to the fiber body 3 is connected through a fiber flange 10, and the fiber body 3 is fixedly connected to one end of the fiber flange 10.

[0038] See also Figure 2A plurality of magnets 11 are embedded on one side of the magnetic lens holder 5 close to the base 1, and the magnetic lens holder 5 is fixed to the base 1 by magnetic attraction through the magnets 11. When in use, the magnetic lens holder 5 can be adsorbed on the surface of the base 1 through the setting of the magnets 11, so as to facilitate position adjustment.

[0039] See also Figure 2 The magnetic lens bracket 5 is provided with two through holes 12 , and the screws 4 pass through the corresponding through holes 12 and fix the magnetic lens bracket 5 on the base 1 .

[0040] See also Figure 1 and Figure 2 The diameter of the through hole 12 is larger than the diameter of the screw 4. When in use, due to the difference in diameter between the through hole 12 and the screw 4, the magnetic lens bracket 5 can be adjusted in the Y and Z directions by translating.

[0041] See also Figure 1 and Figure 2 The top screw 8 is threadedly connected to the top of the magnetic lens bracket 5, and the bottom end of the top screw 8 extends to the inside of the sleeve 6 and abuts against the top of the lens barrel 7. When in use, the lens barrel 7 can be adjusted in the X direction in the sleeve 6, and the top screw 8 can be used to fix the lens barrel 7 in time after adjustment, thereby improving its stability.

[0042] See also Figure 3 The laser body 2 is a helium-neon laser, and the lens 9 is a spherical lens with an anti-reflection film on the surface. The helium-neon laser emits a 632.8nm wavelength laser which is focused and coupled into the optical fiber body 3 through the lens 9. The surface of the lens 9 is coated with a 632.8nm anti-reflection film. The lens 9 is a spherical lens with a focal length of 15mm. The numerical aperture of the optical fiber body 3 is 0.22 and the core diameter is 200um.

[0043] Embodiment 2:

[0044] See also Figure 1 , Figure 2 and Figure 4 A fiber coupling device comprises a base 1, a laser body 2 and a fiber body 3. The laser body 2 and the fiber body 3 are respectively located at two ends of the base 1. One end of the base 1 close to the laser body 2 is fixedly connected to a magnetic lens holder 5 by two screws 4. A sleeve 6 is connected through the middle of the magnetic lens holder 5, and one end of the sleeve 6 extends to the inner side of the base 1. A lens barrel 7 is arranged on the inner side of the sleeve 6 and fixed by a top screw 8. A lens 9 is fixedly installed on the end of the lens barrel 7 close to the laser body 2. An end of the base 1 close to the fiber body 3 is connected through a fiber flange 10, and the fiber body 3 is fixedly connected to one end of the fiber flange 10.

[0045] See also Figure 2A plurality of magnets 11 are embedded on one side of the magnetic lens holder 5 close to the base 1, and the magnetic lens holder 5 is fixed to the base 1 by magnetic attraction through the magnets 11. When in use, the magnetic lens holder 5 can be adsorbed on the surface of the base 1 through the setting of the magnets 11, so as to facilitate position adjustment.

[0046] See also Figure 2 The magnetic lens bracket 5 is provided with two through holes 12 , and the screws 4 pass through the corresponding through holes 12 and fix the magnetic lens bracket 5 on the base 1 .

[0047] See also Figure 1 and Figure 2 The diameter of the through hole 12 is larger than the diameter of the screw 4. When in use, due to the difference in diameter between the through hole 12 and the screw 4, the magnetic lens bracket 5 can be adjusted in the Y and Z directions by translating.

[0048] See also Figure 1 and Figure 2 The top screw 8 is threadedly connected to the top of the magnetic lens bracket 5, and the bottom end of the top screw 8 extends to the inside of the sleeve 6 and abuts against the top of the lens barrel 7. When in use, the lens barrel 7 can be adjusted in the X direction in the sleeve 6, and the top screw 8 can be used to fix the lens barrel 7 in time after adjustment, thereby improving its stability.

[0049] See also Figure 4 , the laser body 2 is an ultraviolet solid laser, the lens 9 is an aspherical lens, and the surface is coated with an anti-reflection film. The ultraviolet solid laser emits a 355nm wavelength laser, which is focused and coupled into the optical fiber body 3 through the lens 9, wherein the surface of the lens 9 is coated with a 355nm anti-reflection film, the lens 9 is an aspherical lens with a focal length of 10mm, the numerical aperture of the optical fiber body 3 is 0.22, and the core diameter is 400um.

[0050] Working principle: When in use, the laser body 2 is used to make the spatial light beam incident into the optical fiber coupling device through the lens 9. After the light beam is incident, the optical fiber coupling device focuses the spatial light beam on the end face of the optical fiber body 3 to be coupled. Loosen the screw 4. Since the diameter of the through hole 12 is larger than the diameter of the screw 4, the focus spot can be adjusted in the Y and Z directions of the end face of the optical fiber body 3 to be coupled by adjusting the magnetic lens bracket 5. After the adjustment is completed, fix the screw 4, and then loosen the top screw 8. By adjusting the relative position between the lens barrel 7 and the sleeve 6, the focus position of the focused light beam can be adjusted in the X direction. After the adjustment is completed, lock the top screw 8.

[0051] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, 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. Therefore, they cannot be understood as limitations on the present invention.

[0052] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A fiber coupling device, comprising a base (1), a laser body (2) and a fiber body (3), wherein the laser body (2) and the fiber body (3) are respectively located at two ends of the base (1), characterized in that: One end of the base (1) close to the laser body (2) is fixedly connected to a magnetic lens bracket (5) by two screws (4); a sleeve (6) is connected through the middle of the magnetic lens bracket (5), and one end of the sleeve (6) extends to the inside of the base (1); a lens barrel (7) is arranged on the inside of the sleeve (6) and is fixed by a top screw (8); a lens (9) is fixedly installed on one end of the lens barrel (7) close to the laser body (2); an end of the base (1) close to the optical fiber body (3) is connected through the optical fiber flange (10), and the optical fiber body (3) is fixedly connected to one end of the optical fiber flange (10).

2. The optical fiber coupling device according to claim 1, characterized in that: A plurality of magnets (11) are embedded on one side of the magnetic lens holder (5) close to the base (1), and the magnetic lens holder (5) is fixed to the base (1) by magnetic attraction via the magnets (11).

3. The optical fiber coupling device according to claim 1, characterized in that: The magnetic lens bracket (5) is provided with two through holes (12), and the screws (4) pass through the corresponding through holes (12) to fix the magnetic lens bracket (5) on the base (1).

4. The optical fiber coupling device according to claim 3, characterized in that: The diameter of the through hole (12) is greater than the diameter of the screw (4).

5. The optical fiber coupling device according to claim 1, characterized in that: The top screw (8) is threadedly connected to the top of the magnetic lens bracket (5), and the bottom end of the top screw (8) extends to the inside of the sleeve (6) and abuts against the top of the lens barrel (7).

6. The optical fiber coupling device according to claim 1, characterized in that: The laser body (2) is a helium-neon laser, and the lens (9) is a spherical lens with an anti-reflection film coated on its surface.

7. The optical fiber coupling device according to claim 1, characterized in that: The laser body (2) is an ultraviolet solid laser, and the lens (9) is an aspherical lens with an anti-reflection film coated on its surface.

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