Five-dimensional precise adjustment miniaturized optical fiber coupler integrated with half-wave plate

Abstract

The invention relates to the technical field of laser optical fibers, and discloses a five-dimensional precise adjustment miniaturized optical fiber coupler integrated with a half-wave plate, which comprises a base, the lower end of a coupling joint is inserted into the base from the top of the base, and an aspherical lens is correspondingly arranged below the coupling joint; the rear cover plate is arranged at the bottom of the base, and a fixed seat is arranged on the lower surface of the rear cover plate; the threaded connection seat is in threaded connection with the fixed seat; and the half-wave plate is arranged in the threaded connection seat, a first through hole for laser to pass through is formed in the middle of the rear cover plate, and the half-wave plate corresponds to the first through hole. The half-wave plate and the optical fiber coupler are integrated, so that the laser polarization state can be matched with the polarization characteristic of the optical fiber; the five-dimensional adjusting mechanism can drive the lens groove to move along the X axis, the Y axis and the Z axis, the position of the lens can be changed, the angle of the lens relative to the coupling joint can be changed, and the coupling precision is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser fiber, in particular to a five-dimensional precise adjustment miniaturized fiber coupler integrated with a half-wave plate. BACKGROUND

[0002] The fiber coupler has been widely applied to scientific technology, medical equipment, industrial manufacturing, communication technology, national defense and military, etc. due to its small and compact structure, high integration, convenient adjustment and good stability. However, there are still some technical problems in the coupling of the existing fiber coupler. For example, for a single-mode fiber, the core diameter and numerical aperture of the single-mode fiber are very small, which makes it difficult for laser to accurately correspond to the single-mode fiber, affecting the coupling precision. In addition, for a polarization-sensitive single-mode fiber, the polarization state of the incident laser needs to be accurately controlled to match the polarization characteristics of the fiber. For this problem, the existing processing method is to connect a polarizer in series in the optical path, which increases the volume of the optical path system and may produce new alignment errors, further affecting the coupling precision.

[0003] Therefore, how to provide a fiber coupler integrated with polarization control function and improve the alignment precision of fiber laser is a problem to be solved by those skilled in the art. SUMMARY

[0004] The purpose of the present application is to provide a five-dimensional precise adjustment miniaturized fiber coupler integrated with a half-wave plate to solve the problems existing in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides a five-dimensional precise adjustment miniaturized fiber coupler integrated with a half-wave plate, comprising:

[0006] A base, the lower end of the coupling joint is inserted into the base from the top of the base, and an aspheric lens is arranged below the coupling joint;

[0007] A rear cover plate is arranged at the bottom of the base, and a fixing seat is arranged on the lower surface of the rear cover plate;

[0008] A threaded connection seat is threadedly connected with the fixing seat;

[0009] A half-wave plate is arranged in the threaded connection seat, a first through hole for laser passing through is formed in the middle of the rear cover plate, and the half-wave plate corresponds to the first through hole.

[0010] Further, an accommodating cavity with an open bottom is defined in the base, the lower end of the coupling joint is inserted into the accommodating cavity, and further comprising:

[0011] A lens cover, the aspheric lens is arranged in the lens cover;

[0012] A lens groove, wherein the lens cover is disposed within the lens groove;

[0013] A magnetic base is disposed within the lens groove and located at the bottom of the lens groove, and the lens cover is disposed on the magnetic base;

[0014] The offset plate has a lens groove that is magnetically attached to its upper surface via a magnetic base, and its lower surface is connected to a rear cover plate. The magnetic base, lens groove, and offset plate are all provided with a second through hole for laser transmission, and the second through hole corresponds to the first through hole.

[0015] A tension spring, one end of which is connected to the offset plate and the other end of which is connected to the base, with the connection point near the upper surface of the base;

[0016] A five-dimensional adjustment mechanism is connected to the lens slot via a transmission, and is used to drive the lens slot to move along the X-axis, Y-axis and Z-axis.

[0017] Furthermore, the five-dimensional adjustment mechanism includes:

[0018] A front cover plate is fixedly installed on the top of the base, and the lower end of the coupling connector passes through the front cover plate and is inserted into the receiving cavity;

[0019] The Z-axis adjusting bolt is threaded to the front cover plate, and its lower end extends into the receiving cavity and connects with the offset plate. When the Z-axis adjusting bolt rotates, the Z-axis adjusting bolt drives the offset plate to move up and down along the Z-axis.

[0020] Furthermore, the coupling joint is located in the middle of the front cover plate, and there are multiple Z-axis adjusting bolts that are evenly arranged around the circumference of the coupling joint.

[0021] Furthermore, the front cover plate is connected to the base by fastening screws, which are spaced apart from the Z-axis adjusting bolts.

[0022] Furthermore, it also includes:

[0023] The offset plate has a groove corresponding to the Z-axis adjusting bolt. The limiting pins are respectively arranged on the left inner wall and the right inner wall of the groove, forming a slide for the Z-axis adjusting bolt to move up and down along the Z-axis. The Z-axis adjusting bolt is adapted to the slide, and its lower end extends into the slide and connects with the bottom of the groove.

[0024] Furthermore, the five-dimensional adjustment mechanism also includes:

[0025] The X-axis adjusting bolt is arranged along the X-axis direction and threadedly connected to the base, with its inner end extending into the receiving cavity and connecting to the lens groove.

[0026] The Y-axis adjusting bolt is arranged along the Y-axis direction and threadedly connected to the base. Its inner end extends into the receiving cavity and connects with the lens groove. When the X-axis adjusting bolt and the Y-axis adjusting bolt rotate, the X-axis adjusting bolt and the Y-axis adjusting bolt drive the lens groove to move along the X-axis and the Y-axis.

[0027] The fastening bolts are used to fasten the lens groove, which is circular. The X-axis adjusting bolts and Y-axis adjusting bolts divide the lens groove into a right-angled arc region and an obtuse-angled arc region. The fastening bolts are threaded to the base, and their inner ends extend into the receiving cavity and connect with the obtuse-angled arc region of the lens groove.

[0028] Furthermore, an elastic connecting plate is provided between the fastening bolt and the magnetic base.

[0029] Furthermore, the outer surface of the threaded connector is provided with a scale along the circumference.

[0030] The present invention discloses the following technical effects:

[0031] (1) This invention integrates a half-wave plate with an optical fiber coupler, enabling the laser polarization state to match the optical fiber polarization characteristics. Compared with existing optical fiber couplers, it eliminates the need for an additional polarizer in series on the optical path, thereby improving coupling accuracy. The threaded connection between the threaded connector and the fixed base allows the half-wave plate to adapt to incident lasers with different polarization states, meeting diverse coupling needs without replacing components, expanding the applicable scenarios of the coupler, and reducing usage costs.

[0032] (2) The present invention can drive the lens slot to move along the X-axis, Y-axis and Z-axis through the five-dimensional adjustment mechanism. It can not only change the position of the lens, but also change the angle of the lens relative to the coupling connector. Compared with the existing fiber coupler, it can make the laser and the fiber precisely correspond and improve the coupling accuracy. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Fig. 1 This is a schematic diagram of the structure of the present invention;

[0035] Fig. 2 This is a schematic diagram of the structure of the present invention after the base is removed;

[0036] Fig. 3 This is a cross-sectional view of the present invention;

[0037] Fig. 4This is a diagram showing the arrangement of tension springs;

[0038] The components are as follows: 1. Base; 2. Coupling connector; 3. Fastening screw; 4. Front cover plate; 5. Aspherical lens; 6. Lens cover; 7. Lens groove; 8. Magnetic base; 9. Offset plate; 10. Tension spring; 11. Rear cover plate; 12. Fixing seat; 13. Threaded connection seat; 14. Half-wave plate; 15. Z-axis adjusting bolt; 16. Groove; 17. Limit pin; 18. X-axis adjusting bolt; 19. Y-axis adjusting bolt; 20. Fastening bolt; 21. Elastic connecting plate. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] like Figs. 1 to 4 As shown, the present invention provides a miniaturized fiber optic coupler with integrated half-wave plate and five-dimensional precision adjustment, comprising:

[0042] The lower end of the coupling connector 2 is inserted into the base 1 from the top of the base 1, and an aspherical lens 5 is arranged below the coupling connector 2.

[0043] The rear cover plate 11 is disposed at the bottom of the base 1, and the lower surface of the rear cover plate 11 is provided with a fixing seat 12;

[0044] The threaded connector 13 is threadedly connected to the fixed seat 12.

[0045] A half-wave plate 14 is disposed inside the threaded connector 13. A first through hole for laser to pass through is provided in the middle of the rear cover plate 11, and the half-wave plate 14 corresponds to the first through hole.

[0046] In this embodiment, the base 1 defines a receiving cavity with a bottom opening, the lower end of the coupling connector 2 is inserted into the receiving cavity, and the device also includes a component disposed within the receiving cavity:

[0047] Lens cover 6, aspherical lens 5 is disposed inside lens cover 6;

[0048] Lens groove 7, lens cover 6 is disposed in lens groove 7;

[0049] A magnetic base 8 is disposed within the lens groove 7 and located at the bottom of the lens groove 7, and a lens cover 6 is disposed on the magnetic base 8;

[0050] The offset plate 9 and lens groove 7 are magnetically attached to the upper surface of the offset plate 9 via the magnetic base 8, and the lower surface of the offset plate 9 is connected to the rear cover plate 11; the magnetic base 8, lens groove 7 and offset plate 9 are all provided with a second through hole for laser to pass through, and the second through hole corresponds to the first through hole.

[0051] The tension spring 10 is connected at one end to the offset plate 9 and at the other end to the base 1, with the connection point close to the upper surface of the base 1;

[0052] The five-dimensional adjustment mechanism is connected to the lens slot 7 via a transmission and is used to drive the lens slot 7 to move along the X-axis, Y-axis and Z-axis.

[0053] In this embodiment, a connecting rod is provided inside the base 1, and the other end of the tension spring 10 is hooked to the connecting rod.

[0054] In this embodiment, the five-dimensional adjustment mechanism includes:

[0055] The front cover plate 4 is fixedly installed on the top of the base 1, and the lower end of the coupling connector 2 passes through the front cover plate 4 and is inserted into the receiving cavity;

[0056] Z-axis adjusting bolt 15 is threaded to the front cover plate 4. Its lower end extends into the receiving cavity and connects with the offset plate 9. When the Z-axis adjusting bolt 15 rotates, the Z-axis adjusting bolt 15 drives the offset plate 9 to move up and down along the Z-axis.

[0057] In this embodiment, the coupling joint 2 is located in the middle of the front cover plate 4, and there are multiple Z-axis adjusting bolts 15 that are evenly arranged along the circumference of the coupling joint 2.

[0058] When all Z-axis adjusting bolts 15 are adjusted synchronously, the offset plate 9 moves up and down along the Z-axis, while the tension spring 10 provides a reverse preload. At this time, the position of the aspherical lens is adjusted along the Z-axis. When only one Z-axis adjusting bolt 15 is adjusted, the angle of the aspherical lens can be changed. The specific model and length of the Z-axis adjusting bolt 15 can be flexibly adjusted according to actual usage requirements to meet the up and down movement distance requirements of the offset plate 9.

[0059] In this embodiment, the front cover plate 4 is connected to the base by fastening screws 3, and the fastening screws 3 and the Z-axis adjusting bolts 15 are arranged at intervals.

[0060] In this embodiment, it also includes:

[0061] The limiting pin 17 and the offset plate 9 have grooves 16 corresponding to the Z-axis adjusting bolt 15. The limiting pin 17 is arranged on the left inner side wall and the right inner side wall of the groove 16 respectively, forming a slide for the Z-axis adjusting bolt 15 to move up and down along the Z-axis. The Z-axis adjusting bolt 15 is adapted to the slide, and its lower end extends into the slide and connects with the bottom of the groove 16.

[0062] In this embodiment, the five-dimensional adjustment mechanism further includes:

[0063] X-axis adjusting bolt 18 is arranged along the X-axis direction and threadedly connected to base 1. Its inner end extends into the receiving cavity and connects with lens groove 7.

[0064] Y-axis adjusting bolt 19 is arranged along the Y-axis direction and threadedly connected to the base 1. Its inner end extends into the receiving cavity and connects with the lens groove 7. When the X-axis adjusting bolt 18 and the Y-axis adjusting bolt 19 rotate, the X-axis adjusting bolt 18 and the Y-axis adjusting bolt 19 drive the lens groove 7 to move along the X-axis and the Y-axis.

[0065] The fastening bolt 20 is used. The lens groove 7 is circular. The X-axis adjusting bolt 18 and the Y-axis adjusting bolt 19 divide the lens groove 7 into a right-angled arc area and an obtuse-angled arc area. The fastening bolt 20 is threaded to the base 1, and its inner end extends into the receiving cavity and connects with the obtuse-angled arc area of ​​the lens groove 7.

[0066] Adjusting the X-axis adjusting bolt 18 and the Y-axis adjusting bolt 19 can change the position of the aspherical lens along the X and Y axes, while the fastening bolt 20 serves to tighten and maintain the stability of the aspherical lens.

[0067] In this embodiment, an elastic connecting plate 21 is provided between the fastening bolt 20 and the magnetic base 8.

[0068] In this embodiment, the outer surface of the threaded connector 13 is provided with a scale along the circumference.

[0069] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0070] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A miniaturized fiber optic coupler with integrated half-wave plate and five-dimensional precision adjustment, characterized in that, include: The lower end of the coupling connector (2) is inserted into the base (1) from the top of the base (1), and an aspherical lens (5) is arranged below the coupling connector (2). A rear cover plate (11) is provided at the bottom of the base (1), and a fixing seat (12) is provided on the lower surface of the rear cover plate (11). The threaded connector (13) is threadedly connected to the fixed seat (12); A half-wave plate (14) is disposed inside the threaded connector (13). A first through hole for laser to pass through is provided in the middle of the rear cover plate (11). The half-wave plate (14) corresponds to the first through hole.

2. The miniaturized fiber optic coupler with integrated half-wave plate according to claim 1, characterized in that, The base (1) defines a receiving cavity with a bottom opening, the lower end of the coupling connector (2) is inserted into the receiving cavity, and the coupling connector (2) also includes a receiving cavity containing: Lens cover (6), the aspherical lens (5) is disposed inside the lens cover (6); Lens groove (7), the lens cover (6) is disposed in the lens groove (7); A magnetic base (8) is disposed in the lens groove (7) and located at the bottom of the lens groove (7), and a lens cover (6) is disposed on the magnetic base (8); The offset plate (9) is magnetically attached to the upper surface of the lens groove (7) by the magnetic base (8), and the lower surface of the offset plate (9) is connected to the rear cover plate (11); the magnetic base (8), the lens groove (7) and the offset plate (9) are all provided with a second through hole for laser to pass through, and the second through hole corresponds to the first through hole; The tension spring (10) is connected at one end to the offset plate (9) and at the other end to the base (1), with the connection point close to the upper surface of the base (1); The five-dimensional adjustment mechanism is connected to the lens groove (7) for driving the lens groove (7) to move along the X-axis, Y-axis and Z-axis.

3. The miniaturized fiber optic coupler with integrated half-wave plate for five-dimensional precision adjustment according to claim 2, characterized in that, The five-dimensional adjustment mechanism includes: The front cover plate (4) is fixedly installed on the top of the base (1), and the lower end of the coupling connector (2) passes through the front cover plate (4) and is inserted into the receiving cavity; The Z-axis adjusting bolt (15) is threadedly connected to the front cover plate (4), and its lower end extends into the receiving cavity and connects with the offset plate (9). When the Z-axis adjusting bolt (15) rotates, the Z-axis adjusting bolt (15) drives the offset plate (9) to move up and down along the Z-axis.

4. The miniaturized fiber optic coupler with integrated half-wave plate according to claim 3, characterized in that, The coupling joint (2) is located in the middle of the front cover plate (4), and there are multiple Z-axis adjusting bolts (15) that are evenly arranged around the coupling joint (2).

5. A miniaturized fiber optic coupler with integrated half-wave plate for five-dimensional precision adjustment according to claim 4, characterized in that, The front cover plate (4) is connected to the base by fastening screws (3), and the fastening screws (3) and the Z-axis adjusting bolts (15) are arranged at intervals.

6. The miniaturized fiber optic coupler with integrated half-wave plate according to claim 3, characterized in that, Also includes: The limiting pin (17) and the offset plate (9) have a groove (16) corresponding to the Z-axis adjusting bolt (15). The limiting pin (17) is arranged on the left inner side wall and the right inner side wall of the groove (16) respectively, and forms a slide for the Z-axis adjusting bolt (15) to move up and down along the Z-axis. The Z-axis adjusting bolt (15) is adapted to the slide, and its lower end extends into the slide and connects with the bottom of the groove (16).

7. A miniaturized fiber optic coupler with integrated half-wave plate for five-dimensional precision adjustment according to claim 3, characterized in that, The five-dimensional adjustment mechanism also includes: X-axis adjusting bolt (18) is arranged along the X-axis direction and threadedly connected to the base (1), with its inner end extending into the receiving cavity and connecting to the lens groove (7); Y-axis adjusting bolt (19) is arranged along the Y-axis direction and threadedly connected to the base (1). Its inner end extends into the receiving cavity and connects with the lens groove (7). When the X-axis adjusting bolt (18) and the Y-axis adjusting bolt (19) rotate, the X-axis adjusting bolt (18) and the Y-axis adjusting bolt (19) drive the lens groove (7) to move along the X-axis and Y-axis. The fastening bolt (20) is circular. The X-axis adjusting bolt (18) and Y-axis adjusting bolt (19) divide the lens groove (7) into a right-angled arc region and an obtuse-angled arc region. The fastening bolt (20) is threaded to the base (1), and its inner end extends into the receiving cavity and connects with the obtuse-angled arc region of the lens groove (7).

8. A miniaturized fiber optic coupler with integrated half-wave plate for five-dimensional precision adjustment according to claim 7, characterized in that, An elastic connecting plate (21) is provided between the fastening bolt (20) and the magnetic base (8).

9. A miniaturized fiber optic coupler with integrated half-wave plate for five-dimensional precision adjustment according to claim 1, characterized in that, The outer surface of the threaded connector (13) is provided with a scale along the circumference.

Images