A spot focusing and shaping lens barrel and its method and application

Abstract

The invention discloses a spot focusing and shaping lens barrel and a method and application thereof, comprising: a focusing seat, a first lens group installed in the focusing seat, a lens barrel installed on the light-emitting side of the focusing seat, and a second lens group installed in the lens barrel. The first lens group is installed at the light-entering end of the cavity; the first lens group comprises a second lens frame and a first lens frame, one end of the second lens frame is connected to the light-emitting side of the optical fiber interface, an aspheric lens is installed in the second lens frame, and a Powell prism is installed in the first lens frame; the interior of the lens barrel is hollow to form an optical cavity, and the second lens group comprises a double-cemented lens and an aperture. The focusing seat is threadedly connected to the lens barrel, and the external optical fiber head is connected to the optical fiber interface. The light beam is adjusted to a line light through the first lens group, and then the line light is adjusted to a desired light spot through the second lens group. The distance between the Powell prism of the focusing seat and the double-cemented lens is used to obtain a desired square light spot with a specific size and uniform power distribution, which matches the laser optical fiber transmission.

Description

Technical Field

[0001] The invention belongs to the technical field of light spot shaping, and in particular relates to a light spot focusing shaping lens barrel and a method and application thereof. Background Art

[0002] In a specific experiment, the area of ​​the laser action zone is required to be as large as possible and uniform without dark areas. In actual use, the shape of the optical fiber transmitted laser is a divergent circular spot. Most of the existing shaping devices are circular spot shaping devices and cannot change the shape of the spot. The existing shaping device shapes the laser shape to form a circular spot, which is reflected multiple times in later experimental use. The laser action area formed by the connection of the circular spots after multiple reflections has a dark area that cannot be covered. The existence of a large area of ​​dark area will reduce the coverage area of ​​the laser action area.

[0003] Therefore, in order to solve the above technical problems, it is necessary to design a spot focusing and shaping lens barrel for optical fiber light output that can adjust the optical fiber light output so that there is no dark area in the light action area after the optical fiber light output. Summary of the invention

[0004] The purpose of the present invention is to provide a spot focusing and shaping lens barrel with a simple structure, which can adjust the light output of an optical fiber into a square spot and provide a light action area without a dark area for subsequent experiments.

[0005] Another object of the present invention is to provide a method for focusing and shaping a light spot lens barrel.

[0006] Another object of the present invention is to provide an application of a light spot focusing and shaping lens barrel.

[0007] The technical solution of the present invention is as follows:

[0008] A spot focusing and shaping lens barrel comprises: a focusing seat, a first lens group installed in the focusing seat, a lens barrel installed on the light-emitting side of the focusing seat, and a second lens group installed in the lens barrel, wherein the focusing seat is rotatably connected to the lens barrel to adjust the distance between the first lens group and the second lens group;

[0009] The light input end of the focusing seat is provided with an optical fiber interface for connecting with an external optical fiber head to input a light beam. The interior of the focusing seat is a cavity, and the first lens group is installed at the light input end of the cavity.

[0010] The first lens assembly includes a second lens frame and a first lens frame, one end of the second lens frame is connected to the light-emitting side of the optical fiber interface, and the other end is connected to the first lens frame, an aspheric lens is installed in the second lens frame, a Powell prism is installed in the first lens frame, and a first prism pressing ring is installed on the light-emitting side of the first lens frame for fixing the Powell prism;

[0011] The interior of the lens barrel is hollow to form an optical cavity, and a plurality of grooves are formed on the inner wall of the optical cavity at the light-emitting side for mounting the second lens group;

[0012] The second lens group includes a doublet lens and an aperture. The doublet lens consists of a convex lens and a concave lens. The doublet lens is clamped in the groove. A second prism pressing ring is installed on the light-emitting side of the concave lens to fix the doublet lens.

[0013] In the above technical solution, an outer thread is formed on the bottom of the first frame, and an inner thread matching the outer thread is formed on the top of the second frame. The first frame is threadedly connected to the second frame.

[0014] In the above technical solution, the distance between the aspherical mirror and the Powell prism is 7.8 mm.

[0015] In the above technical solution, the focal length of the aspherical mirror is 4.51 mm.

[0016] In the above technical solution, the angle θ of the Powell prism is 110°.

[0017] In the above technical solution, the distance between the Powell prism and the double cemented lens is 200 mm ± 5 mm, and the distance between the Powell prism and the double cemented lens is adjusted by the focusing seat to obtain a square light spot of a desired size.

[0018] In the above technical solution, the diameter of the double-cemented lens is 60mm, wherein the material of the convex lens is K9, the double-sided curvature radii are 140.5mm and -98.3078mm respectively, and the thickness is 11mm; the material of the concave lens is ZF6, the double-sided curvature radii are -98.3078mm and -299.2mm respectively, and the thickness is 6.15mm.

[0019] In the above technical solution, the bottom end of the focusing seat is threadedly connected to the top end of the lens barrel.

[0020] In the above technical solution, the total length of the shaping lens barrel is 255 mm and the outer diameter is 66 mm.

[0021] In the above technical solution, the size of the aperture is 50*20 mm.

[0022] A method for a spot focusing and shaping lens barrel comprises the following steps:

[0023] (1) The optical fiber interface is connected to the external optical fiber head, and the light beam is input into the focusing seat from the optical fiber interface to adjust the position between the focusing seat and the lens barrel;

[0024] (2) The light beam enters the aspheric lens in the focusing seat, and is converted into parallel light by the aspheric lens. The parallel light is then converted into line light by the Powell prism.

[0025] (3) The line light in step (2) is irradiated to the double-cemented lens through the optical cavity of the lens barrel, and the line light is converted into a square light spot through the double-cemented lens and the aperture.

[0026] A light spot focusing and shaping lens barrel is used in a shaping and collecting experimental system. The shaping and collecting experimental system comprises a shaping lens barrel and two reflecting light cavities for reflecting the light spot. The two reflecting light cavities are arranged opposite to each other. The reflecting light cavity close to the side of the shaping lens barrel is provided with a rectangular light hole parallel to the light emitting side of the shaping lens barrel. Each reflecting light cavity is provided with four reflecting lenses arranged in parallel from top to bottom and an adjusting component correspondingly installed on the reflecting lenses for adjusting the position of the lenses.

[0027] The advantages and positive effects of the present invention are:

[0028] 1. The focusing seat is threadedly connected to the lens barrel, and the external fiber head is connected to the fiber interface. The light beam is adjusted to line light through the first lens group, and then the line light is adjusted to the required light spot through the second lens group. The distance between the Powell prism and the double-cemented lens is adjusted through the focusing seat to obtain the required square light spot of specific size and uniform power distribution, which matches the laser fiber transmission.

[0029] 2. After the square light spot emitted by the shaping lens barrel of the present invention is connected with the measurement experimental system, it can cover the entire laser action plane. Compared with the traditional circular light spot, it solves the problem of several dark areas caused by the connection of circular light spots. The square light spot makes the dark area disappear in the laser action plane, effectively improving the laser utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the light spot focusing and shaping lens barrel of the present invention;

[0031] In the figure:

[0032] 1. Focusing seat 2. Second frame 3. Powell prism

[0033] 4. Optical fiber interface 5. First prism clamp 6. First mirror frame

[0034] 7. Aspheric lens 8. Optical cavity 9. Lens tube

[0035] 10. Mounting nut 11. Aperture 12. Convex lens

[0036] 13. Concave lens 14. Second prism pressure ring DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention, and in no way limit the protection scope of the present invention.

[0038] Example 1

[0039] As shown in the figure, a spot focusing and shaping lens barrel of the present invention comprises: a focusing seat 1, a first lens group installed in the focusing seat 1, a lens barrel installed on the light-emitting side of the focusing seat 1, and a second lens group installed in the lens barrel, wherein the focusing seat is rotatably connected to the lens barrel to adjust the distance between the first lens group and the second lens group;

[0040] The light input end of the focusing seat 1 is provided with an optical fiber interface 4 (model: SMA905 optical fiber interface 4) for connecting with an external optical fiber head to input a light beam. The interior of the focusing seat 1 is a cavity, and the first lens group is installed at the light input end of the cavity;

[0041] The first lens assembly includes a second lens frame 2 and a first lens frame 6, one end of the second lens frame 2 is connected to the light-emitting side of the optical fiber interface 4, and the other end is connected to the first lens frame 6, an aspheric lens 7 is installed in the second lens frame 2, a Powell prism 3 is installed in the first lens frame 6, and a first prism pressing ring 5 is installed on the light-emitting side of the first lens frame 6 for fixing the Powell prism 3;

[0042] The interior of the lens barrel is hollow to form an optical cavity 8, and a plurality of grooves are formed on the inner wall of the optical cavity 8 at the light-emitting side for mounting the second lens group;

[0043] The second lens group includes a double-cemented lens and an aperture 11. The double-cemented lens is composed of a convex lens 12 and a concave lens 13. The double-cemented lens is clamped in the groove. A second prism pressing ring 14 is installed on the light-emitting side of the concave lens 13 for fixing the double-cemented lens. The aperture 11 is installed in the optical cavity 8 through a mounting nut 10.

[0044] Specifically, an outer thread is formed on the bottom of the first lens frame 6 , and an inner thread matching the outer thread is formed on the top of the second lens frame 2 . The first lens frame 6 is threadedly connected to the second lens frame 2 .

[0045] Furthermore, the distance between the aspherical mirror and the Powell prism 3 is 7.8 mm.

[0046] Furthermore, the focal length of the aspherical mirror is 4.51 mm.

[0047] Furthermore, the angle θ of the Powell prism 3 is 110°.

[0048] Specifically, the distance between the Powell prism 3 and the doublet lens is 200 mm±5 mm, and the distance between the Powell prism and the doublet lens is adjusted by a focusing seat to obtain a square light spot of a desired size.

[0049] Furthermore, the diameter of the double-cemented lens is 60 mm, wherein the material of the convex lens 12 is K9, the double-sided curvature radii are 140.5 mm and -98.3078 mm respectively, and the thickness is 11 mm; the material of the concave lens 13 is ZF6, the double-sided curvature radii are -98.3078 mm and -299.2 mm respectively, and the thickness is 6.15 mm.

[0050] Furthermore, the bottom end of the focusing seat 1 is threadedly connected to the top end of the lens barrel.

[0051] Furthermore, the total length of the shaping lens barrel is 255 mm and the outer diameter is 66 mm.

[0052] Furthermore, the size of the aperture 11 is 50*20 mm.

[0053] Example 2

[0054] On the basis of Example 1, a method of the light spot focusing and shaping lens barrel according to Example 1 of the present invention comprises the following steps:

[0055] (1) The optical fiber interface 4 is connected to the external optical fiber head (the optical fiber core diameter is 910 μm and the numerical aperture is 0.22), and the light beam is input into the focusing seat 1 from the optical fiber interface 4 to adjust the position between the focusing seat 1 and the lens barrel;

[0056] (2) The light beam enters the aspheric lens in the focusing seat 1, and is converted into parallel light by the aspheric lens 7, and then the parallel light is converted into line light by the Powell prism 3;

[0057] (3) The line light in step (2) is irradiated into the double-cemented lens through the optical cavity 8 of the lens barrel, and the line light is converted into a square light spot by the double-cemented lens.

[0058] Example 3

[0059] On the basis of Example 1, an application of a light spot focusing and shaping lens barrel of the present invention is used in a shaping and collecting experimental system, wherein the collecting experimental system includes a shaping lens barrel and two reflecting light cavities 8 for reflecting the light spot, the two reflecting light cavities 8 are arranged opposite to each other, and the reflecting light cavity close to the side of the shaping lens barrel is equipped with a rectangular light hole parallel to the light output side of the shaping lens barrel, and each reflecting light cavity 8 is provided with four reflecting lenses arranged in parallel from top to bottom and corresponding adjustment components installed on the reflecting lenses for adjusting the position of the lenses.

[0060] Specifically, the distance between the two return light cavities 8 is 600 mm.

[0061] In the shaping and collection experiment, the shaping lens barrel is adjusted and connected to the external light head, a square light spot is emitted from the shaping lens barrel, and the shaping lens barrel adjusted to produce the desired square light spot is installed on the base of the optical platform, and the horizontal dimension of the base is adjusted so that the emission direction of the emitted square light spot is level with the optical platform, and the two reflecting light cavities 8 are respectively installed on the required mounting holes of the optical platform, and the height of the reflecting light cavity 8 is adjusted so that the emitted square light spot can smoothly enter the light-through hole, and then the position of the reflecting lens is adjusted by adjusting the components respectively, so that the square light spot is reflected to form a preset effect, so that the light spot is better distributed, thereby improving the ionization rate of the flying atomic beam.

[0062] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the elements described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0063] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0064] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.

Claims

1. A spot focusing and shaping lens barrel, characterized in that: It comprises a focusing seat, a first lens group installed in the focusing seat, a lens barrel installed on the light-emitting side of the focusing seat, and a second lens group installed in the lens barrel, wherein the focusing seat is rotatably connected to the lens barrel to adjust the distance between the first lens group and the second lens group; The light input end of the focusing seat is provided with an optical fiber interface for connecting with an external optical fiber head to input a light beam. The interior of the focusing seat is a cavity, and the first lens group is installed at the light input end of the cavity. The first lens group includes an aspherical lens and a Powell prism; The interior of the lens barrel is hollow to form an optical cavity, and a plurality of grooves are formed on the inner wall of the optical cavity at the light-emitting side for mounting the second lens group; The second lens group includes a doublet lens and an aperture, wherein the doublet lens is composed of a convex lens and a concave lens, the doublet lens is clamped in the groove, and a second prism pressing ring is installed on the light-emitting side of the concave lens to fix the doublet lens, so that the divergent light emitted by the optical fiber head is converted into a square light spot through the aspheric lens, the Powell prism, the doublet lens and the aperture in sequence; The first lens assembly also includes a second lens frame and the first lens frame, one end of the second lens frame is connected to the light-emitting side of the optical fiber interface, and the other end is connected to the first lens frame, the aspheric lens is installed in the second lens frame, the Powell prism is installed in the first lens frame, and a first prism pressing ring is installed on the light-emitting side of the first lens frame for fixing the Powell prism; The distance between the Powell prism and the double cemented lens is 200 mm±5 mm, and the distance between the Powell prism and the double cemented lens is adjusted by a focusing seat to obtain a square light spot of a required size.

2. The light spot focusing and shaping lens barrel according to claim 1, characterized in that: An external thread is formed on the outer side of the bottom of the first mirror frame, and an internal thread matching the external thread is formed on the top of the second mirror frame. The first mirror frame is threadedly connected to the second mirror frame.

3. The spot focusing and shaping lens barrel according to claim 2, characterized in that: The distance between the aspheric lens and the Powell prism is 7.8 mm.

4. The spot focusing and shaping lens barrel according to claim 1, characterized in that: The bottom end of the focusing seat is threadedly connected with the top end of the lens barrel.

5. The spot focusing and shaping lens barrel according to claim 4, characterized in that: The total length of the shaping lens barrel is 255 mm and the outer diameter is 66 mm.

6. The spot focusing and shaping lens barrel according to claim 5, characterized in that: The size of the aperture is 50*20 mm.

7. A method for using the spot focusing and shaping lens barrel according to claim 6, characterized in that: The following steps are involved: (1) The optical fiber interface is connected to the external optical fiber head, and the light beam is input into the focusing seat from the optical fiber interface to adjust the position between the focusing seat and the lens barrel; (2) The light beam enters the aspheric lens in the focusing seat, and is converted into parallel light by the aspheric lens. The parallel light is then converted into line light by the Powell prism. (3) The line light in step (2) is irradiated into the double-cemented lens through the optical cavity of the lens barrel, and the line light is converted into a square light spot through the double-cemented lens and the aperture.

8. An application of the spot focusing and shaping lens barrel according to claim 6 in a shaping and collecting experimental system, characterized in that: The shaping and collection experimental system includes a shaping lens barrel and two reflecting light cavities for reflecting light spots. The two reflecting light cavities are arranged opposite to each other. The reflecting light cavity close to the side of the shaping lens barrel is equipped with a rectangular light hole parallel to the light output side of the shaping lens barrel. Each reflecting light cavity is provided with four reflecting lenses arranged in parallel from top to bottom and an adjusting component correspondingly installed on the reflecting lenses for adjusting the position of the lenses.

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