Distributed area array optical fiber collimation light source system

Abstract

A distributed area array optical fiber collimation light source system disclosed by the present invention comprises a laser, an aspherical lens, a cage type optical adjustment frame, an optical fiber, a mirror chamber and a rigid support aluminum alloy plate, the support aluminum alloy plate is provided with a plurality of mirror chamber holes and is provided with the mirror chamber, and the aspherical lens is arranged between the laser and the optical fiber and in the mirror chamber. The cage type optical adjusting frame is installed on the back face of the supporting aluminum alloy plate. Laser emitted by the laser is collimated by the aspherical front lens and coupled to the optical fiber to be output, translation and pitching of the Z axis of the output end of the optical fiber are adjusted through the cage type optical adjusting frame, and finally the laser is output after being collimated by the aspherical lenses installed in the plurality of lens chambers on the supporting aluminum alloy plate. The distributed area array optical fiber collimation light source system has the advantages of being compact in structure, light in weight, small in size, light in weight, high in flexibility, low in requirements for load bearing, space and the like of an installation site, easy and convenient to install and adjust, low in cost, wide in application range, safe and reliable.

Description

Technical Field

[0001] This invention relates to the field of optical engineering technology, and in particular to a distributed area array fiber collimated light source system. Background Technology

[0002] With the increasing demands for spatial resolution and light-gathering capabilities in optical systems from fields such as astronomical observation, atmospheric sounding, and precision machining, increasing the system's aperture has become a direct way to improve performance. However, this comes at the cost of increased weight and cost for the optical system. Parallel light source systems, as the infrastructure providing high-collimation beams, play an irreplaceable role in optical metrology, remote sensing calibration, space target simulation, and high-resolution imaging system testing. With the improvement of deep space exploration accuracy and the development of laser communication technology, the manufacture of large-aperture, high-stability parallel light sources has become particularly important.

[0003] Traditional large-aperture collimating light source systems require metal support structures and large-aperture optical components, resulting in excessive overall weight. They necessitate dedicated spaces and impose requirements on laboratory load-bearing capacity and spatial layout. Furthermore, the complexity of fabrication and assembly necessitates the design of multi-degree-of-freedom active support structures to counteract gravitational deformation. Their excessive weight, low flexibility, and high cost significantly limit their application scenarios, such as vehicle-mounted, airborne mobile platforms, or aerospace satellite testing. Summary of the Invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a distributed area array fiber collimation light source system.

[0005] This invention proposes a distributed area array fiber optic collimated light source system, characterized by comprising: a laser, an aspherical lens, a cage-type optical adjustment frame, an optical fiber, a mirror chamber, and a supporting aluminum alloy plate. The supporting aluminum alloy plate has several mirror chamber holes, and several mirror chambers are arranged and installed in the mirror chamber holes. The aspherical lens consists of an aspherical front lens and an aspherical back lens. The aspherical front lens is positioned between the laser and the optical fiber. Several aspherical back lenses are arranged and installed in the mirror chambers. Two cage-type optical adjustment frames are arranged and installed on the front and rear sides of the optical fiber, respectively, for adjusting the angles of the input and output ends of the optical fiber. The laser emitted by the laser is focused by the aspherical front lens and the incident angle at the input end is adjusted by the cage-type optical adjustment frame before being coupled into the optical fiber for output. The angle of the output end of the optical fiber is then adjusted by the cage-type optical adjustment frame, and finally collimated by the aspherical back lenses installed in the several mirror chambers on the supporting aluminum alloy plate before being output.

[0006] Preferably, the laser emitted by the laser has a wavelength of 632.8 nm.

[0007] Preferably, the optical fiber is a 1-to-7 fiber bundle with a core diameter of 50 μm, an NA of 0.22, and an SMA905 fiber interface.

[0008] Preferably, the mirror chamber is a tubular structure with a stepped inner wall and a large inner diameter at the front end and a small inner diameter at the rear end. The aspherical rear lens is inserted into the mirror chamber from the front end and then fixed by a pressure ring to prevent the aspherical rear lens from axial displacement.

[0009] Preferably, an annular limiting protrusion is provided on the outer wall of the rear end of the mirror chamber, and the front end of the mirror chamber is inserted from the front of the supporting aluminum alloy plate into the mirror chamber hole provided on the supporting aluminum alloy plate until the annular limiting protrusion of the mirror chamber is blocked outside the mirror chamber hole.

[0010] Preferably, a threaded cover plate is installed on the back of the supporting aluminum alloy plate, and the threaded cover plate fixes the mirror chamber in the mirror chamber hole of the supporting aluminum alloy plate.

[0011] Preferably, the cage-type optical adjustment frame is the MC-T2 model product from Base Optics, compatible with 60mm cage-type system components; the cage-type support rod is a cage-like structure composed of several parallel support rods; the cage-type optical adjustment frame located in front of the optical fiber is fixed by Base Optics' CA60-A column connector and PCA5-A lifting and adjusting support rod, while the CA60-A column connector is fixed to the optical platform by an M-BASE-D fork-type pressure plate; the cage-type optical adjustment frame located behind the optical fiber is fixedly installed on the threaded cover plate on the back of the supporting aluminum alloy plate by the cage-type support rod, and the two mating parts of the cage-type optical adjustment frame and the threaded cover plate are concentric.

[0012] Preferably, the supporting aluminum alloy plate is made of high-strength aluminum alloy material, and the plurality of mirror chamber holes provided thereon are evenly distributed in a ring. The back of the supporting aluminum alloy plate is provided with a plurality of triangular or fan-shaped blind holes.

[0013] Preferably, the supporting aluminum alloy plate has 43 mirror chamber holes, which are distributed in a central and four annular rings. That is, there is one mirror chamber hole at the center point of the supporting aluminum alloy plate, and a first annular ring composed of six mirror chamber holes and a second, third, and fourth annular rings composed of twelve mirror chamber holes are arranged outside the center point of the supporting aluminum alloy plate.

[0014] The beneficial effects of this invention are as follows:

[0015] This invention discloses a distributed area array fiber optic collimating light source system. It employs a lightweight supporting aluminum alloy plate based on high-strength aluminum alloy, which highly integrates several independent fiber optic collimating light source units. Through precise back-side perforation topology optimization design, the overall weight is significantly reduced while ensuring structural rigidity and heat dissipation performance, thus achieving a perfect balance between high strength and lightweight. A high-brightness fiber laser array serves as the core light source, utilizing the fiber array to achieve lightweight beam transmission. This invention features a compact structure, lightweight design, small size, light weight, and high flexibility. It has low requirements for the load-bearing capacity and space of the installation site, is simple and convenient to install and adjust, has low cost, wide application range, and is safe and reliable. Attached Figure Description

[0016] Figure 1 : A schematic diagram of the overall structure of the present invention;

[0017] Figure 2 : A schematic diagram of the structure of the mirror chamber of the present invention;

[0018] Figure 3 : A schematic diagram of the structure of the cage-type optical adjustment frame, cage-type support rod and threaded cover plate of the present invention;

[0019] Figure 4 The optical design of the aspherical lens of this invention is illustrated in the ZEMAX wavefront diagram.

[0020] Figure 5 : A schematic diagram of the supporting aluminum alloy plate of the present invention;

[0021] Figure 6 This invention provides a finite deformation analysis diagram for rigidly supported aluminum alloy plates. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Example 1:

[0024] Reference Figure 1-6 The present invention proposes a distributed area array fiber collimation light source system, comprising: a laser 1, an aspherical lens 2, a cage-type optical adjustment frame 3, an optical fiber 4, a mirror chamber 5, and a rigid support aluminum alloy plate 9.

[0025] The aspherical lens 2 consists of an aspherical front lens and an aspherical rear lens. The aspherical front lens is positioned between the laser 1 and the optical fiber 4. Several aspherical rear lenses are installed in the lens chamber 5. The optical fiber 4 is a 1-to-7 fiber bundle with a core diameter of 50 μm, an NA of 0.22, and an SMA905 fiber interface.

[0026] The supporting aluminum alloy plate 9 has several mirror chamber holes, and several mirror chambers 5 are provided and installed in the mirror chamber holes. The mirror chamber holes on the supporting aluminum alloy plate 9 are evenly distributed in a ring. The back of the supporting aluminum alloy plate 9 has several blind holes of triangular, fan-shaped or other irregular shapes. The blind holes can effectively reduce the weight of the supporting aluminum alloy plate 9 and achieve the goal of lightweight design.

[0027] A threaded cover plate 7 is installed on the back of the supporting aluminum alloy plate 9, and the threaded cover plate 7 fixes the mirror chamber 5 in the mirror chamber hole of the supporting aluminum alloy plate 9.

[0028] The cage-type optical adjustment bracket 3 is the MC-T2 model product from Base Optics, compatible with 60mm cage-type system components. The cage-type support rod 8 is a cage-like structure composed of several parallel support rods. The cage-type optical adjustment bracket 3, located in front of the fiber optic cable 4, is fixed by Base Optics' CA60-A column connector and PCA5-A lifting and adjusting support rod, while the CA60-A column connector is fixed to the optical platform by an M-BASE-D fork-type pressure plate. The cage-type optical adjustment bracket 3, located behind the fiber optic cable 4, is fixedly mounted on the threaded cover plate 7 on the back of the supporting aluminum alloy plate 9 via the cage-type support rod 8, ensuring that the two mating parts of the cage-type optical adjustment bracket 3 and the threaded cover plate 7 are concentric.

[0029] The laser emitted by laser 1 is focused by an aspherical front lens and the incident angle of the input end is adjusted by a cage-type optical adjustment frame 3. Then it is coupled to the output of the optical fiber 4. The angle of the output end of the optical fiber is adjusted by the cage-type optical adjustment frame 3. Finally, it is collimated by aspherical back lenses installed in several mirror chambers 5 on the supporting aluminum alloy plate 9 before being output.

[0030] The present invention discloses a distributed area array fiber collimating light source system, which adopts a lightweight support aluminum alloy plate 9 based on high-strength aluminum alloy material. The support aluminum alloy plate 9 highly integrates several independent fiber collimating light source units. Through precise back-side perforation topology optimization design, the overall weight is significantly reduced while ensuring structural rigidity and heat dissipation performance, thus achieving a perfect balance between high strength and lightweight. A high-brightness fiber laser array is used as the core light source, and the fiber array is used to achieve lightweight beam transmission.

[0031] This invention features a compact structure and lightweight design, characterized by small size, light weight, and high flexibility. It has low requirements for the load-bearing capacity and space of the installation site, is simple and convenient to install and adjust, has low cost, wide range of applications, and is safe and reliable.

[0032] Example 2:

[0033] Reference Figure 1-6The present invention proposes a distributed area array fiber collimation light source system, comprising: a laser 1, an aspherical lens 2, a cage-type optical adjustment frame 3, an optical fiber 4, a mirror chamber 5, and a rigid support aluminum alloy plate 9.

[0034] Laser 1 emits a laser with a wavelength of 632.8 nm. The aspherical lens 2 consists of an aspherical front lens and an aspherical back lens. The aspherical front lens is positioned between laser 1 and optical fiber 4. Several aspherical back lenses are installed within the lens chamber 5. The aspherical front and back lenses are assembled in different directions. The aspherical front lens is assembled in reverse to focus the collimated light emitted from laser 1 and spatially couple it into the input end of optical fiber 4. The aspherical back lens is assembled in the forward direction to collimate the light emitted from the output end of optical fiber 4.

[0035] The collimated light source includes an aspherical lens, producing parallel light at a distance of 50 mm after emission, with a central field-of-view wavefront RMS of 0.0018λ. The parameters are as follows:

[0036] element radius of curvature thickness Material Half diameter Conic coefficient unlimited 5 — 28 — lens 91.404 10 SILICA 28 -0.580 unlimited 193.141 — 28 —

[0037] like Figure 3 As shown, the cage-type optical adjustment bracket 3 is the MC-T2 model product from Base Optics, compatible with 60mm cage-type system components, with a precision of 1 urad. The cage-type support rod 8 is a cage-like structure composed of several parallel support rods. The cage-type optical adjustment bracket 3, located in front of the fiber optic 4, is fixed by Base Optics' CA60-A column connector and PCA5-A lifting adjustment support rod, while the CA60-A column connector is fixed to the optical platform by an M-BASE-D fork-type pressure plate. The cage-type optical adjustment bracket 3, located behind the fiber optic 4, is fixed to the rear side of the threaded cover plate 7 on the back of the supporting aluminum alloy plate 9 via the cage-type support rod 8. By sliding the threaded cover plate 7 and the supporting aluminum alloy plate 9 on the cage-type support rod 8, the two mating parts of the cage-type optical adjustment bracket 3 and the threaded cover plate 7 can be made concentric, ensuring that the output end of the fiber optic 4 and the aspherical rear lens are concentric, so that the optical axis of the components can be strictly aligned, reducing optical path offset and aberrations. By adjusting the cage-type optical adjustment frame 3, the pitch of the fiber 4 end can be changed, simulating a change in the angle of the incident light, so that the output after passing through the aspherical rear lens is a parallel light source.

[0038] like Figure 4 As shown, the wavefront diagram of a collimated light source using an aspherical lens is presented.

[0039] Fiber 4 is a 1-to-7 fiber bundle with a core diameter of 50μm, an NA of 0.22, and an SMA905 fiber interface. The transmission fiber is flexible and easily bent, allowing for lightweight and miniaturized designs without strict spatial limitations.

[0040] The supporting aluminum alloy plate 9 has several mirror chamber holes, and several mirror chambers 5 are provided and installed one by one in the mirror chamber holes. For example... Figure 2 As shown, the mirror chamber 5 is a tubular structure with a stepped inner wall, and its front end has a larger inner diameter and its rear end has a smaller inner diameter. The aspherical rear lens is inserted into the mirror chamber 5 from the front end and then fixed by the pressure ring 6 to prevent axial displacement of the aspherical rear lens. An annular limiting protrusion is provided on the outer wall of the rear end of the mirror chamber 5. The front end of the mirror chamber 5 is inserted into the mirror chamber hole provided on the supporting aluminum alloy plate 9 from the front end until the annular limiting protrusion of the mirror chamber 5 is blocked outside the mirror chamber hole.

[0041] like Figure 5 As shown, the mirror chamber holes on the supporting aluminum alloy plate 9 are evenly distributed in a ring. For example, there are 43 mirror chamber holes on the supporting aluminum alloy plate 9, distributed in a central and four annular rings. That is, there is one mirror chamber hole at the center point of the supporting aluminum alloy plate 9, and outside the center point of the supporting aluminum alloy plate 9, there is a first annular ring composed of six mirror chamber holes evenly distributed, and a second, third, and fourth annular rings each composed of twelve mirror chamber holes evenly distributed. The six mirror chamber holes in the first annular ring are evenly distributed at 120° intervals at a diameter of 118.75 mm. The second, third, and fourth annular rings are all 1×12 evenly distributed at 60° intervals. The distance between the circle formed by the centers of the twelve holes in each ring and the circle formed by the holes in the previous ring is 118.75 mm.

[0042] The back structure supporting the aluminum alloy plate 9 adopts an open structure, allowing for the direct cutting and forming of several lightweight blind holes in triangular, fan-shaped, or other irregular shapes during the manufacturing process. The shape of the back holes is determined through topology optimization, considering the shape, location, and thickness of the aluminum alloy plate's ribs. The lightweight design ensures the accuracy of the lens surface shape at the hole distribution points. Based on the lens wavefront diagram, the RMS is 0.0018λ, and the maximum deformation of the aluminum alloy plate should be less than 1.15 × 10⁻⁶. -3 mm. The use of blind holes effectively reduces the weight of the supporting aluminum alloy plate 9, achieving the goal of lightweight design.

[0043] Based on engineering experience, the topology optimization resulted in a more symmetrical and regular rib layout, yielding the optimal back rib layout for supporting aluminum alloy plate 9: the back opening depth is 28 mm, the lightweight structure consists of adding triangular ribs within a diameter of 475 mm to ensure central stiffness, and annular and fan-shaped ribs from a diameter of 475 mm to 950 mm to ensure lightweighting rate, with a back rib thickness of 10 mm.

[0044] A threaded cover plate 7 is installed on the back of the supporting aluminum alloy plate 9. The threaded cover plate 7 is compatible with a 60mm cage system and has four through holes for installing cage support rods 8, allowing the threaded cover plate 7 and the supporting aluminum alloy plate 9 to slide on the cage support rods 8 and be fixed with bolts. Each hole on the front of the rigid supporting aluminum alloy plate 9 has three screw holes around it for fixing the mirror chamber 5. On the back, four M4 screw holes are arranged on the circular structural ribs around the holes to fix the threaded cover plate 7. The screw holes between the mirror chamber 5 and the supporting aluminum alloy plate 9 are M6, and M6 bolts are used for fixing.

[0045] like Figure 6 As shown, deformation analysis was performed on the lightweight supporting aluminum alloy plate 9 using finite element analysis software. The theoretical maximum deformation of the supporting aluminum alloy plate 9 in the optical axis direction is 7.8 × 10⁻⁶. -4 The calculated RMS is λ / 80, which meets the wave phase difference design requirements of the optical system.

[0046] The present invention discloses a distributed area array fiber collimation light source system. The laser emitted by the laser 1 is focused by an aspherical front lens and the incident angle of the input end is adjusted by a cage-type optical adjustment frame 3. The laser is then coupled to the output of the fiber 4. The angle of the output end of the fiber is adjusted by the cage-type optical adjustment frame 3. Finally, the laser is collimated by aspherical back lenses installed in several mirror chambers 5 on the supporting aluminum alloy plate 9 before being output.

[0047] The present invention discloses a distributed area array fiber collimating light source system, which adopts a lightweight support aluminum alloy plate 9 based on high-strength aluminum alloy material. The support aluminum alloy plate 9 highly integrates several independent fiber collimating light source units. Through precise back-side perforation topology optimization design, the overall weight is significantly reduced while ensuring structural rigidity and heat dissipation performance, thus achieving a perfect balance between high strength and lightweight. A high-brightness fiber laser array is used as the core light source, and the fiber array is used to achieve lightweight beam transmission.

[0048] This invention features a compact structure and lightweight design, characterized by small size, light weight, and high flexibility. It has low requirements for the load-bearing capacity and space of the installation site, is simple and convenient to install and adjust, has low cost, wide range of applications, and is safe and reliable.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A distributed planar array fiber collimated light source system, characterized in that, include: The system comprises a laser (1), an aspherical lens (2), a cage-type optical adjustment frame (3), an optical fiber (4), a mirror chamber (5), and a supporting aluminum alloy plate (9). The supporting aluminum alloy plate (9) has several mirror chamber holes. Several mirror chambers (5) are arranged and installed in the mirror chamber holes. The aspherical lens (2) consists of an aspherical front lens and an aspherical rear lens. The aspherical front lens is positioned between the laser (1) and the optical fiber (4). Several aspherical rear lenses are arranged and installed in the mirror chambers (5). Two cage-type optical adjustment frames (3) are provided and installed on the front and rear sides of the optical fiber (4) respectively, for adjusting the angle of the input end and the output end of the optical fiber (4); the laser emitted by the laser (1) is focused by the aspherical front lens and the incident angle of the input end is adjusted by the cage-type optical adjustment frame (3), and then coupled into the optical fiber (4) for output. The angle of the output end of the optical fiber (4) is then adjusted by the cage-type optical adjustment frame (3), and finally collimated by the aspherical back lens installed in several mirror chambers (5) on the supporting aluminum alloy plate (9) before being output.

2. The distributed planar array fiber collimating light source system according to claim 1, characterized in that, The laser emitted by the laser (1) has a wavelength of 632.8 nm.

3. The distributed planar array fiber collimated light source system according to claim 1, characterized in that, The optical fiber (4) is a 1-to-7 fiber bundle with a core diameter of 50 μm, an NA of 0.22, and an SMA905 fiber interface.

4. The distributed planar array fiber collimating light source system according to claim 1, characterized in that, The mirror chamber (5) is a tubular structure with a stepped structure on the inner wall, and its front end has a large inner diameter and its rear end has a small inner diameter. The aspherical rear lens is inserted into the mirror chamber (5) from the front end and then fixed by the pressure ring (6) to prevent the aspherical rear lens from axial displacement.

5. The distributed planar array fiber collimated light source system according to claim 4, characterized in that, An annular limiting protrusion is provided on the outer wall of the rear end of the mirror chamber (5). The front end of the mirror chamber (5) is inserted from the front of the supporting aluminum alloy plate (9) into the mirror chamber hole provided on the supporting aluminum alloy plate (9) until the annular limiting protrusion of the mirror chamber (5) is blocked outside the mirror chamber hole.

6. The distributed planar array fiber collimated light source system according to claim 5, characterized in that, A threaded cover plate (7) is installed on the back of the supporting aluminum alloy plate (9), and the threaded cover plate (7) fixes the mirror chamber (5) in the mirror chamber hole of the supporting aluminum alloy plate (9).

7. A distributed planar array fiber collimated light source system according to claim 6, characterized in that, The cage-type optical adjustment frame (3) is the MC-T2 model product of Base Optics, which is compatible with 60mm cage-type system components; the cage-type support rod (8) is a cage-like structure composed of several parallel support rods; the cage-type optical adjustment frame (3) located in front of the optical fiber (4) is fixed by the CA60-A column connector and PCA5-A lifting and adjusting support rod of Base Optics, while the CA60-A column connector is fixed to the optical platform by the M-BASE-D fork pressure plate; the cage-type optical adjustment frame (3) located behind the optical fiber (4) is fixedly installed on the threaded cover plate (7) on the back of the supporting aluminum alloy plate (9) by the cage-type support rod (8), and the two mating parts of the cage-type optical adjustment frame (3) and the threaded cover plate (7) are concentric.

8. The distributed planar array fiber collimated light source system according to claim 1, characterized in that, The supporting aluminum alloy plate (9) is made of high-strength aluminum alloy material, and a number of mirror chamber holes are arranged in a ring evenly. The back of the supporting aluminum alloy plate (9) is provided with a number of triangular or fan-shaped blind holes.

9. A distributed planar array fiber collimated light source system according to claim 8, characterized in that, The supporting aluminum alloy plate (9) has 43 mirror chamber holes, which are distributed in a central and four annular rings. That is, there is one mirror chamber hole at the center point of the supporting aluminum alloy plate (9), and a first annular ring composed of six mirror chamber holes and a second, third, and fourth annular ring composed of twelve mirror chamber holes are arranged outside the center point of the supporting aluminum alloy plate (9).

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