A fiber laser array beam forming and optical axis control device

Abstract

The present invention discloses a fiber laser array beam combining and optical axis control device, comprising a bottom plate and an outer cover arranged on the bottom plate, wherein an AFOC fixing plate, a fixing plate A, a fixing plate B, a water-cooled aperture, a fixing plate C and a fixing plate D are arranged in the outer cover, wherein the AFOC fixing plate, the fixing plate A, the fixing plate B, the water-cooled aperture, the fixing plate C and the fixing plate D are arranged on the bottom plate in sequence and connected in series through an invar rod, wherein a plurality of cameras are arranged on one side of the fixing plate A close to the AFOC fixing plate, a plurality of beam reduction lenses are arranged on one side of the fixing plate A close to the fixing plate B, a plurality of beam splitter components are arranged on the fixing plate D, a plurality of AFOC components are arranged on the AFOC fixing plate, and a lens is arranged on the fixing plate C. The present invention has good practicability for combining multiple laser beams and controlling their optical axis consistency, has a simple structure, is convenient to control, and has good optical axis consistency.

Description

Technical Field

[0001] The invention relates to the field of multi-beam fiber laser synthesis, and in particular to a fiber laser array beam combining and optical axis control device. Background Art

[0002] Fiber laser has a low R&D threshold, good beam quality and wide application value, so it has developed rapidly in recent years. However, the power of a single fiber is limited by physical factors and has a certain upper limit. Therefore, combining multiple optical fibers is an effective way to increase the output power. However, the optical axis consistency of existing multiple optical fibers after synthesis is poor. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a fiber laser array beam combining and optical axis control device which solves the problem of poor optical axis consistency of multi-channel optical fiber synthesis.

[0004] In order to achieve the above-mentioned invention object, the technical scheme adopted by the present invention is: a fiber laser array beam assembly and optical axis control device, comprising a base plate and an outer cover arranged on the base plate, wherein an AFOC fixing plate, a fixing plate A, a fixing plate B, a water-cooled aperture, a fixing plate C and a fixing plate D are arranged in the outer cover, wherein the AFOC fixing plate, the fixing plate A, the fixing plate B, the water-cooled aperture, the fixing plate C and the fixing plate D are arranged on the base plate in sequence and connected in series through an invar rod, wherein a plurality of cameras are arranged on the side of the fixing plate A close to the AFOC fixing plate, a plurality of beam reduction lenses are arranged on the side of the fixing plate A close to the fixing plate B, a plurality of beam splitter assemblies are arranged on the fixing plate D, a plurality of AFOC assemblies are arranged on the AFOC fixing plate, a lens is arranged on the fixing plate C, the number and position of the lenses, the beam splitter assemblies and the AFOC assemblies are the same, and an adjustment window, a connector B and a water nozzle are arranged on the outer cover.

[0005] Furthermore: the fixing plate A, the fixing plate B, the water-cooling aperture and the fixing plate C are connected by reinforcing ribs.

[0006] Furthermore, the AFOC fixing plate, fixing plate A, fixing plate B, water-cooled aperture, fixing plate C and fixing plate D have the same shape and are all regular hexagons.

[0007] Furthermore, the number of the beam splitter components, lenses and AFOC components is 7 each.

[0008] Furthermore: the AFOC assembly includes an AFOC base and an optical fiber bracket and a connector A arranged on the AFOC base, and the AFOC base is square in shape.

[0009] Furthermore, the beam splitter assembly includes an adjusting nut, a beam splitter lens frame and a beam splitter arranged in the beam splitter frame, and the beam splitter frame is circular in shape.

[0010] Furthermore, the centers of the six outer spectroscope frames are connected in sequence to form a regular hexagon, and the remaining spectroscope frame is arranged at the center of the regular hexagon.

[0011] Furthermore, the number of the zoom lenses and cameras is 3, and the positions of the zoom lenses and cameras on the fixing plate A are the same.

[0012] Furthermore: the fixing plate A and the water-cooled aperture are both provided with through holes with the same number and position as the beam splitter components, the through holes on the fixing plate A are rectangular in shape, and the through holes on the water-cooled aperture are circular in shape.

[0013] The beneficial effects of the present invention are as follows: (1) The present invention adopts an interlocking frame bundle structure composed of reinforcing ribs, invar rods and base plates, which has a stable structure, and vibration shock and temperature changes have little effect on the device. At the same time, the frame structure is light in weight and low in cost.

[0014] (2) The present invention adopts a "6+1" bundling method, which is arranged in a regular hexagon and has flexible splicing and scalability.

[0015] (3) The present invention uses a built-in optical axis detection system to detect the focal spots of multiple laser beams and uses this signal to control the consistency of the optical axis pointing; and the design of a beam reduction lens matched with the camera can improve the sensitivity of the detection system and thus improve the control accuracy.

[0016] (4) The present invention uses a two-dimensional uncoupled AFOC device to perform closed-loop regulation on the optical fiber, which reduces the solution time of the control system and increases the closed-loop bandwidth of the optical axis of the device.

[0017] (5) The present invention uses a built-in water-cooled aperture to absorb stray light, thereby reducing the structural thermal deformation caused by stray light and, at the same time, reducing the influence of stray light on optical axis detection.

[0018] (6) The present invention has good practicability in combining multiple laser beams and controlling the consistency of their optical axes, has a simple structure, is easy to control, and has good consistency of optical axes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the present invention;

[0020] Figure 2 It is a side view of the present invention;

[0021] Figure 3 It is the appearance diagram of the present invention.

[0022] Among them: 1. AFOC fixing plate; 2. Fixing plate A; 3. Reinforcement ribs; 4. Camera; 5. Invar rod; 6. Bottom plate; 7. Fixing plate B; 8. Water-cooled aperture; 9. Lens; 10. Fixing plate C; 11. Fixing plate D; 12. Beam reduction lens; 13. Spectroscope; 14. Adjustment nut; 15. Spectroscope lens frame; 16. Fiber optic bracket; 17. Connector A; 18. AFOC base; 19. Connector B; 20. Adjustment window; 21. Outer cover; 22. Water nozzle. DETAILED DESCRIPTION

[0023] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0024] like Figure 1 As shown, a fiber laser array beam forming and optical axis control device comprises a base plate 6 and an outer cover 21 arranged on the base plate 6, wherein an AFOC fixing plate 1, a fixing plate A2, a fixing plate B7, a water-cooled aperture 8, a fixing plate C10 and a fixing plate D11 are arranged in the outer cover 21, wherein the AFOC fixing plate 1, the fixing plate A2, the fixing plate B7, the water-cooled aperture 8, the fixing plate C10 and the fixing plate D11 are arranged on the base plate 6 in sequence and connected in series through an invar rod 5, wherein a plurality of cameras 4 are arranged on the side of the fixing plate A2 close to the AFOC fixing plate 1, a plurality of beam reduction lenses 12 are arranged on the side of the fixing plate A2 close to the fixing plate B7, a plurality of beam splitter assemblies are arranged on the fixing plate D11, a plurality of AFOC assemblies are arranged on the AFOC fixing plate 1, a lens 9 is arranged on the fixing plate C10, and the number and position of the lens 9, the beam splitter assemblies and the AFOC assemblies are the same, and an adjustment window 20, a connector B19 and a water nozzle 22 are arranged on the outer cover 21.

[0025] In one embodiment of the present invention, the fixing plate A2, the fixing plate B7, the water-cooled aperture 8) and the fixing plate C10 are connected by the reinforcing ribs 3. The present invention adopts an interlocking frame bundle structure composed of reinforcing ribs, invar rods and bottom plates, etc., which has a stable structure, and the vibration shock and temperature change have little effect on the device. At the same time, the frame structure is light in weight and low in cost.

[0026] In one embodiment of the present invention, the AFOC fixing plate 1, fixing plate A2, fixing plate B7, water-cooled aperture 8, fixing plate C10 and fixing plate D11 are of the same shape and are all regular hexagons. The present invention adopts a "6+1" beam combination method, arranged in a regular hexagon, with flexible splicing and scalability, and regards the fiber laser array beam combination and optical axis control device as a whole. When the number of fiber laser array beam combination and optical axis control devices is one, the shape of the light spot on the fiber laser array beam combination and optical axis control device is a regular hexagon. When the number of fiber laser array beam combination and optical axis control devices is three, two fiber laser array beam combination and optical axis control devices are arranged at the bottom, and the other fiber laser array beam combination and optical axis control device is arranged at the top center, and the shape of the light spot on the fiber laser array beam combination and optical axis control device is an equilateral triangle.

[0027] In one embodiment of the present invention, the number of the spectroscope assembly, lens 9 and AFOC assembly is 7. The AFOC assembly includes an AFOC base 18 and an optical fiber bracket 16 and a connector A17 arranged on the AFOC base 18, and the shape of the AFOC base 18 is square. The spectroscope assembly includes an adjusting nut 14, a spectroscope lens frame 15 and a spectroscope 13 arranged in the spectroscope frame 15, and the shape of the spectroscope frame 15 is circular. The centers of the six outer spectroscope frames 15 are connected in sequence to form a regular hexagon, and the remaining spectroscope frame 15 is arranged in the center of the regular hexagon.

[0028] In one embodiment of the present invention, the number of the focus reduction lens 12 and the number of the camera 4 are both 3, and the focus reduction lens 12 and the camera 4 are located at the same position on the fixed plate A2. The present invention uses a built-in optical axis detection system to detect the focal spots of multiple laser beams and uses this signal to control the consistency of the optical axis pointing; and the focus reduction lens designed to match the camera can improve the sensitivity of the detection system, thereby improving the control accuracy.

[0029] In one embodiment of the present invention, the fixing plate A2 and the water-cooled aperture 8 are both provided with through holes of the same number and position as the beam splitter assembly, the through holes on the fixing plate A2 are rectangular in shape, and the through holes on the water-cooled aperture 8 are circular in shape. The present invention uses a built-in water-cooled aperture to absorb stray light, that is, to reduce the structural thermal deformation caused by stray light, and at the same time, also reduce the influence of stray light on optical axis detection.

[0030] The working principle of the present invention is as follows: the fiber laser emits light, and after combined beam expansion, all laser beams are emitted from the beam splitter 13. Part of the weak light is reflected by the beam splitter 13 and then enters the lens 9 and the beam reduction lens 12 to the photosensitive surface of the camera 4. The three cameras 4 detect the focal spots of the 7 laser beams in different areas and calculate the centroid, which is compared with the calibrated centroid to form a control deviation. The deviation is converted into a control voltage and loaded onto the AFOC after PID control to perform two-dimensional adjustment, thereby performing closed-loop control on the directivity of all light beams.

Claims

1. A fiber laser array beam forming and optical axis control device, characterized in that: The invention comprises a bottom plate (6) and an outer cover (21) arranged on the bottom plate (6), wherein an AFOC fixing plate (1), a fixing plate A (2), a fixing plate B (7), a water-cooled aperture (8), a fixing plate C (10) and a fixing plate D (11) are arranged in the outer cover (21), wherein the AFOC fixing plate (1), the fixing plate A (2), the fixing plate B (7), the water-cooled aperture (8), the fixing plate C (10) and the fixing plate D (11) are arranged on the bottom plate (6) in sequence and connected in series through an invar rod (5), wherein the fixing plate A (2) is close to the AFOC A plurality of cameras (4) are provided on one side of the fixing plate (1); a plurality of focus lenses (12) are provided on the side of the fixing plate A (2) close to the fixing plate B (7); a plurality of beam splitter assemblies are provided on the fixing plate D (11); a plurality of AFOC assemblies are provided on the AFOC fixing plate (1); a lens (9) is provided on the fixing plate C (10); the number and position of the lenses (9), the beam splitter assemblies and the AFOC assemblies are the same; and an adjustment window (20), a connector B (19) and a water nozzle (22) are provided on the outer cover (21); The number of the beam splitter components, lenses (9) and AFOC components are all 7; The AFOC assembly comprises an AFOC base (18), and an optical fiber bracket (16) and a connector A (17) arranged on the AFOC base (18); the AFOC base (18) is in a square shape; The beam splitter assembly comprises an adjusting nut (14), a beam splitter frame (15), and a beam splitter (13) arranged in the beam splitter frame (15); the beam splitter frame (15) is circular in shape; the centers of the six outer beam splitter frames (15) are connected in sequence to form a regular hexagon, and the remaining beam splitter frame (15) is arranged at the center of the regular hexagon; The fixing plate A (2) and the water-cooled aperture (8) are both provided with through holes having the same number and position as the beam splitter assembly; the through holes on the fixing plate A (2) are rectangular in shape, and the through holes on the water-cooled aperture (8) are circular in shape.

2. The optical fiber laser array beam combining and optical axis control device according to claim 1, characterized in that: The fixing plate A (2), the fixing plate B (7), the water-cooled aperture (8) and the fixing plate C (10) are connected via reinforcing ribs (3).

3. The optical fiber laser array beam combining and optical axis control device according to claim 1, characterized in that: The AFOC fixing plate (1), fixing plate A (2), fixing plate B (7), water-cooled aperture (8), fixing plate C (10) and fixing plate D (11) have the same shape and are all regular hexagons.

4. The optical fiber laser array beam combining and optical axis control device according to claim 1, characterized in that: The number of the focal length reduction lenses (12) and the number of the cameras (4) are both three, and the positions of the focal length reduction lenses (12) and the cameras (4) on the fixing plate A (2) are the same.

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