Speckle-eliminating dodging device applied to multimode optical fiber

Abstract

The utility model discloses a speckle-eliminating dodging device applied to a multimode fiber, which relates to the technical field of laser application and comprises a shell, an input flange plate, an output flange plate, a vibration component and a fiber extrusion component, the input flange plate and the output flange plate are respectively and fixedly arranged at two ends of the shell, the vibration component is fixedly arranged at the bottom of the shell, and the fiber extrusion component is fixedly arranged at the bottom of the shell. The optical fiber extrusion assemblies are connected with the shell in a sliding fit mode, the two optical fiber extrusion assemblies are the first extrusion assembly and the second extrusion assembly respectively, and the first extrusion assembly and the second extrusion assembly are arranged on the two sides of the vibration assembly respectively. Through the synergistic effect of vibration and stretching, speckles of an output light field are greatly reduced, the uniformity of the light field is improved, the speckle contrast ratio is remarkably reduced, and application scenes with high requirements for the quality of the light field can be effectively met. The vibration assembly and the optical fiber extrusion assembly are integrated in the limited shell, the structure is compact, a small space is utilized to achieve the function to the maximum extent, and miniaturization and integration of the device are facilitated.

Description

Technical Field

[0001] This utility model relates to the technical field of laser applications, specifically to a speckle-reducing and light-uniforming device applied to multimode optical fibers. Background Technology

[0002] Lasers possess high brightness and excellent monochromaticity, giving them an advantage over traditional light sources. However, the high coherence of lasers also limits the development of laser displays. When a coherent laser beam strikes a rough surface, interference occurs between the reflected or transmitted light. This results in speckle patterns with uneven intensity distribution.

[0003] Optical fiber, as the core carrier of laser transmission, achieves efficient transmission of light energy through the principle of total internal reflection. Its diameter is only 1 / 10 of that of a human hair, yet it can carry thousands of watts of laser power.

[0004] However, the high coherence of lasers leads to inhomogeneity in the output light field of multimode fibers, making it impossible to suppress speckle patterns. In imaging systems, this results in decreased resolution, while in displays, it manifests as increased graininess and color distortion. Therefore, this issue must be suppressed. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a speckle-reducing and homogenizing device for multimode optical fibers. This device solves the problem that the high coherence of lasers leads to non-uniformity in the output light field of multimode optical fibers, thus making it impossible to suppress speckle in the output light field.

[0006] To achieve the above objectives, this utility model provides a speckle-reducing and light-uniforming device for multimode optical fibers, comprising a housing, an input flange, an output flange, a vibration assembly, and an optical fiber extrusion assembly. The input flange and the output flange are respectively fixedly disposed at both ends of the housing, the vibration assembly is fixedly disposed at the bottom of the housing, and the optical fiber extrusion assembly is slidably connected to the housing. Two sets of optical fiber extrusion assemblies are provided, namely a first extrusion assembly and a second extrusion assembly, which are respectively disposed on both sides of the vibration assembly. Specifically, the optical fiber extrusion assembly includes a movable slider and an optical fiber pressure plate. A horizontal groove is formed at the bottom of the housing, and the movable slider is slidably disposed within the groove. One side of the movable slider is connected to the vibration assembly, and the other side of the movable slider is connected to the optical fiber pressure plate.

[0007] According to one embodiment of the present invention, the optical fiber extrusion assembly further includes a tension spring, one end of which is connected to the movable slider of the first extrusion assembly, and the other end of which is connected to the movable slider of the second extrusion assembly.

[0008] According to one embodiment of this utility model, the optical fiber extrusion assembly further includes clamping bolts and clamping nuts. The movable slider and the optical fiber pressure plate have interconnected through holes on their sides. The clamping bolts are disposed through the through holes, and the clamping nuts are threadedly connected to the clamping bolts. Specifically, the movable slider and the optical fiber pressure plate have a plurality of through holes arranged in a matrix. A plurality of clamping bolts and clamping nuts are provided, and the clamping bolts are disposed through the corresponding through holes.

[0009] According to one embodiment of the present invention, a groove is provided on one side of the movable slider, and a protrusion that cooperates with the groove is fixedly provided on one side of the optical fiber pressure plate.

[0010] According to one embodiment of this utility model, a buffer assembly is fixedly disposed at the bottom of the housing, and the vibration assembly is fixedly connected to the buffer assembly. Specifically, the buffer assembly includes an elastic element and a movable base plate. One end of the elastic element is fixedly connected to the housing, and the other end of the elastic element is fixedly connected to the movable base plate. The vibration assembly is fixedly disposed on the top of the movable base plate. The elastic element includes a spring, one end of which is fixedly connected to the housing, and the other end of which is fixedly connected to the movable base plate.

[0011] According to one embodiment of the present invention, the vibration component is a piezoelectric ceramic, and the first extrusion component and the second extrusion component are respectively disposed on both sides of the piezoelectric ceramic.

[0012] The advantages of this utility model compared to the prior art are:

[0013] Through the synergistic effect of vibration and stretching, the speckle pattern of the output optical field is significantly reduced, improving optical field uniformity and significantly lowering speckle contrast, effectively meeting the needs of applications with high optical field quality requirements. The vibration and fiber extrusion components are integrated within a limited housing, resulting in a compact structure that maximizes functionality within a small space, facilitating miniaturization and integration of the device. It is suitable for various types of multimode fibers, providing good speckle suppression and optical field homogenization effects for multimode fibers with different core diameters and characteristics.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0016] Figure 1 This is a schematic diagram of a three-dimensional structure of a speckle-reducing and light-uniforming device applied to multimode optical fibers.

[0017] Figure 2 This is a three-dimensional structural diagram of the optical fiber extrusion assembly in this utility model.

[0018] Figure 3 This is a three-dimensional structural diagram of the buffer component in this utility model.

[0019] Figure 4 This is a three-dimensional structural diagram of the tension spring in this utility model.

[0020] The reference numerals in the figures include:

[0021] 1. Housing; 2. Input flange; 3. Output flange; 4. Vibration assembly; 5. Fiber optic extrusion assembly; 6. First extrusion assembly; 7. Second extrusion assembly; 8. Movable slider; 9. Fiber optic pressure plate; 10. Slide groove; 11. Tension spring; 12. Clamping bolt; 13. Clamping nut; 14. Through hole; 15. Groove; 16. Protrusion; 17. Buffer assembly; 18. Elastic element; 19. Movable base plate; 20. Piezoelectric ceramic. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figures 1 to 4 As shown, a speckle-reducing and homogenizing device for multimode optical fibers includes a housing 1, an input flange 2, an output flange 3, a vibration assembly 4, and an optical fiber extrusion assembly 5. The input flange 2 and output flange 3 are fixedly mounted at both ends of the housing 1, the vibration assembly 4 is fixedly mounted at the bottom of the housing 1, and the optical fiber extrusion assembly 5 is slidably connected to the housing 1. Two sets of the optical fiber extrusion assembly 5 are provided, namely a first extrusion assembly 6 and a second extrusion assembly 7, which are respectively located on both sides of the vibration assembly 4. Specifically, the optical fiber extrusion assembly 5 includes a movable slider 8 and an optical fiber pressure plate 9. A horizontal groove 10 is formed at the bottom of the housing 1, and the movable slider 8 is slidably mounted within the groove 10. One side of the movable slider 8 is connected to the vibration assembly 4, and the other side of the movable slider 8 is connected to the optical fiber pressure plate 9.

[0024] Multimode optical fiber enters the housing 1 from the input flange 2 and exits the housing 1 from the output flange 3 after being wound around the first extrusion assembly 6 and the second extrusion assembly 7. When the vibration assembly 4 operates, the resulting vibration is transmitted to the connected movable slider 8. Since the movable slider 8 slides within the groove 10 at the bottom of the housing 1 and is connected to the fiber pressure plate 9, the multimode optical fiber is wound between the fiber pressure plates 9 of the two sets of fiber extrusion assemblies 5 (the first extrusion assembly 6 and the second extrusion assembly 7). Therefore, the vibration of the vibration assembly 4 not only causes the multimode optical fiber to vibrate together, but also applies a lateral tensile force to the multimode optical fiber through the movable slider 8. This results in greater coupling between different modes within the fiber, and the light field output from the output flange 3 has different phases. The persistence of vision in the human eye averages the rapidly changing light field, thereby achieving homogenization of the multimode optical fiber output light field and speckle suppression.

[0025] Through the synergistic effect of vibration and stretching, the speckle pattern of the output optical field is significantly reduced, improving optical field uniformity and significantly reducing speckle contrast, effectively meeting the requirements of applications with high optical field quality. The vibration component 4 and fiber extrusion component 5 are integrated within a limited housing 1, resulting in a compact structure that maximizes functionality within a small space, facilitating miniaturization and integration of the device. It is suitable for various types of multimode fibers, providing good speckle suppression and optical field homogenization effects for multimode fibers with different core diameters and characteristics.

[0026] refer to Figure 4 As shown, in some specific embodiments, the optical fiber extrusion assembly 5 further includes a tension spring 11, one end of which is connected to the movable slider 8 of the first extrusion assembly 6, and the other end of which is connected to the movable slider 8 of the second extrusion assembly 7.

[0027] When the vibration component 4 drives the movable slider 8 to move, the tension spring 11 will undergo elastic deformation according to the movement of the slider. During the vibration process, the tension spring 11 assists in maintaining the movement of the movable slider 8 through its own elastic force, thereby enhancing the stretching amplitude of the optical fiber; on the other hand, when the vibration direction changes, the elastic force of the tension spring 11 can quickly adjust the position of the movable slider 8, making the stretching process of the optical fiber more periodic and stable.

[0028] refer to Figure 2As shown, in some specific embodiments, the fiber extrusion assembly 5 further includes clamping bolts 12 and clamping nuts 13. The movable slider 8 and the fiber pressure plate 9 have interconnected through holes 14 on their sides. The clamping bolts 12 are disposed through the through holes 14, and the clamping nuts 13 are threadedly connected to the clamping bolts 12. Specifically, the movable slider 8 and the fiber pressure plate 9 have several through holes 14 arranged in a matrix. Several clamping bolts 12 and clamping nuts 13 are also provided, with the clamping bolts 12 passing through the corresponding through holes 14.

[0029] By adjusting the tightness of the clamping nut 13, the compressive force of the fiber optic clamping plate 9 on the multimode fiber can be changed. The clamping bolts 12 and nuts at different positions can be adjusted individually, thereby precisely controlling the degree of compression and bending state of the fiber at different positions.

[0030] refer to Figure 2 As shown, in some specific embodiments, a groove 15 is provided on one side of the movable slider 8, and a protrusion 16 that mates with the groove 15 is fixedly provided on one side of the fiber pressure plate 9. The undulating surfaces of the groove 15 and the protrusion 16 help to further reduce the speckle of the laser beam.

[0031] refer to Figure 3 As shown, in some specific embodiments, a buffer assembly 17 is fixedly disposed at the bottom of the housing 1, and the vibration assembly 4 is fixedly connected to the buffer assembly 17. Specifically, the buffer assembly 17 includes an elastic element 18 and a movable base plate 19. One end of the elastic element 18 is fixedly connected to the housing 1, and the other end of the elastic element 18 is fixedly connected to the movable base plate 19. The vibration assembly 4 is fixedly disposed on the top of the movable base plate 19. The elastic element 18 includes a spring, one end of which is fixedly connected to the housing 1, and the other end of which is fixedly connected to the movable base plate 19.

[0032] When the vibration component 4 is working, the movable base plate 19 can move independently relative to the housing 1 under the elastic support of the spring. The spring plays a role in buffering and resonance, reducing the attenuation of the vibration of the vibration component 4 by the housing 1 on the one hand, and forming resonance at a specific frequency on the other hand, amplifying the vibration amplitude of the vibration component 4.

[0033] refer to Figure 3 As shown, in some specific embodiments, the vibration component 4 is a piezoelectric ceramic 20, and the first extrusion component 6 and the second extrusion component 7 are respectively disposed on both sides of the piezoelectric ceramic 20. When an alternating electric field is applied, the piezoelectric ceramic 20 generates the inverse piezoelectric effect, that is, it produces mechanical vibration according to the change in the electric field. In this device, the piezoelectric ceramic 20 serves as the vibration component 4, and the high-frequency vibration it generates can be quickly transmitted to the connected movable slider 8 and multimode optical fiber, realizing the vibration and stretching effect on the optical fiber. By adjusting the frequency and amplitude of the alternating electric field applied to the piezoelectric ceramic 20, the frequency and amplitude of the vibration can be precisely controlled.

[0034] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of the embodiments of this solution will now be explained in conjunction with specific application scenarios:

[0035] When the vibration component 4 operates, the generated vibration is transmitted to the connected movable slider 8. Since the movable slider 8 slides within the groove 10 at the bottom of the housing 1 and is connected to the fiber pressure plate 9, the multimode fiber is wound between the fiber pressure plates 9 of the two sets of fiber compression components 5 (first compression component 6 and second compression component 7). Therefore, the vibration of the vibration component 4 not only causes the multimode fiber to vibrate together, but also applies a lateral tensile force to the multimode fiber through the movable slider 8. This results in greater coupling between different modes within the fiber, and the light field output from the output flange 3 has different phases. The persistence of vision in the human eye averages the rapidly changing light field, thereby achieving homogenization of the multimode fiber output light field and speckle suppression.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A diffusion spot uniformity device applied to a multimode optical fiber, characterized by, The utility model provides an optical fiber extrusion assembly, which comprises a shell (1), an input flange (2), an output flange (3), a vibration assembly (4) and an optical fiber extrusion assembly (5), the input flange (2) and the output flange (3) are fixedly arranged at two ends of the shell (1) respectively, the vibration assembly (4) is fixedly arranged at the bottom of the shell (1), the optical fiber extrusion assembly (5) is slidably connected with the shell (1), the optical fiber extrusion assembly (5) is provided with two groups, and is respectively a first extrusion assembly (6) and a second extrusion assembly (7), the first extrusion assembly (6) and the second extrusion assembly (7) are arranged at two sides of the vibration assembly (4) respectively.

2. The speckle-eliminating uniform light device for a multi-mode optical fiber according to claim 1, wherein The optical fiber extrusion assembly (5) comprises a movable sliding block (8) and an optical fiber pressing plate (9), the bottom of the shell (1) is provided with a horizontal chute (10), the movable sliding block (8) is slidably arranged in the chute (10), one side of the movable sliding block (8) is connected with the vibration assembly (4), and the other side of the movable sliding block (8) is connected with the optical fiber pressing plate (9).

3. The speckle-eliminating uniform light device for a multi-mode optical fiber according to claim 2, wherein The optical fiber extrusion assembly (5) further comprises a tension spring (11), one end of the tension spring (11) is connected with the movable sliding block (8) of the first extrusion assembly (6), and the other end of the tension spring (11) is connected with the movable sliding block (8) of the second extrusion assembly (7).

4. The speckle-eliminating uniformizing optical device for a multimode optical fiber according to claim 2, wherein The optical fiber extrusion assembly (5) further comprises a compression bolt (12) and a compression nut (13), the side of the movable sliding block (8) and the optical fiber pressing plate (9) is provided with a through hole (14) in communication, the compression bolt (12) is arranged in the through hole (14) in a penetrating mode, and the compression nut (13) is threadedly connected with the compression bolt (12).

5. A diffraction spot uniforming device for use with a multimode optical fiber as defined in claim 4, wherein, The through hole (14) of the movable sliding block (8) and the optical fiber pressing plate (9) is provided with a plurality of through holes (14) and is arranged in a matrix mode, the compression bolt (12) and the compression nut (13) are provided with a plurality of compression bolts (12) and compression nuts (13), and the compression bolt (12) is arranged in the corresponding through hole (14) in a penetrating mode.

6. The speckle-eliminating uniformizing optical device for a multimode optical fiber according to claim 2, wherein One side of the movable sliding block (8) is provided with a groove (15), and one side of the optical fiber pressing plate (9) is fixedly provided with a protruding block (16) matched with the groove (15).

7. The speckle-eliminating uniformizing optical device for a multimode optical fiber according to claim 1, wherein The bottom of the shell (1) is fixedly provided with a buffer assembly (17), and the vibration assembly (4) is fixedly connected with the buffer assembly (17).

8. The speckle-eliminating uniformizing optical device for a multimode optical fiber according to claim 7, wherein The buffer assembly (17) comprises an elastic member (18) and a movable bottom plate (19), one end of the elastic member (18) is fixedly connected with the shell (1), the other end of the elastic member (18) is fixedly connected with the movable bottom plate (19), and the vibration assembly (4) is fixedly arranged at the top of the movable bottom plate (19).

9. The speckle-eliminating uniformizing optical device for a multimode optical fiber according to claim 8, wherein The elastic member (18) comprises a spring, one end of the spring is fixedly connected with the shell (1), and the other end of the spring is fixedly connected with the movable bottom plate (19).

10. The speckle-eliminating uniformizing optical device for a multimode optical fiber according to claim 1, wherein The vibration assembly (4) is a piezoelectric ceramic (20), and the first extrusion assembly (6) and the second extrusion assembly (7) are arranged at two sides of the piezoelectric ceramic (20) respectively.

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