Light trap structure for miniature laser

Abstract

The invention relates to a light trap structure for miniature laser, and belongs to the technical field of optical equipment, the light trap structure comprises a cavity, a triangular body group, a conical structure and a reflector, the cavity is provided with a light inlet port, the triangular body group is located at the light inlet port of the cavity and is fixed in the cavity, the conical structure is fixed in the cavity, the conical structure directly faces the light inlet port, and the reflector is fixed in the cavity. The conical structure is used for absorbing light at the light inlet port, the reflecting mirror is located on the inner side wall of the cavity and fixed in the cavity, the reflecting mirror is used for receiving light emitted from the conical structure and can reflect the light to the triangular body group, and the light sequentially passes through the conical structure and the reflecting mirror from the light inlet port and then reaches the triangular body group; the invention has the following beneficial effects: the conical structure realizes high-efficiency collection and focusing of light, and the triangular body group absorbs most of the light.

Description

Technical Field

[0001] The invention belongs to the technical field of optical equipment, and in particular relates to a light trap structure for micro lasers. Background Art

[0002] Pyrolytic particles, also called "pyrolytic ions", are formed when the material in the environment is damaged by heat. The outer electrons of the atoms escape due to the energy enhancement, causing the material to be "ionized" and release charged pyrolytic ions. The very early equipment overheating detection system is a system based on pyrolytic ion detection. In order to detect equipment overheating more accurately, pyrolytic ions need to be accurately detected. However, accurate detection is inseparable from the accuracy and miniaturization of the optical trap structure.

[0003] Laser light trap is a structure that can collect stray light or unwanted light. It is now mostly used in scattered light collection systems to absorb scattered stray light and improve equipment accuracy. Laser light trap plays an important role in laser technology, communications, etc. Traditional laser light traps usually include lenses or reflectors to focus or collect light, and are often used in lasers, optical communication systems and other equipment.

[0004] However, traditional laser light traps have the problems of large size, complex manufacturing and high cost. In applications such as micro lasers and micro optical communication systems, optical collectors with smaller size, simplified manufacturing process and lower cost are needed.

[0005] Therefore, it is necessary to provide a new type of optical trap structure for micro-lasers, which can not only meet the needs of extremely early equipment overheating detection systems for optical traps and achieve efficient collection and focusing of light, but also has the advantages of small size, simple manufacturing and low cost. Summary of the invention

[0006] The present invention mainly solves the technical problem of how to efficiently collect and focus light. The present invention provides a light trap structure for micro lasers. The light passes through a cone structure and a reflector from a light input port in sequence, and then reaches a triangular group. The cone structure realizes efficient collection and focusing of the light, and the triangular group absorbs most of the light.

[0007] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0008] A light trap structure for micro laser, comprising:

[0009] A cavity having a light input port;

[0010] A triangular body group, the triangular body group is located at the light entrance port of the cavity, and the triangular body group is fixed in the cavity, and the triangular body group is used to consume the light in the cavity;

[0011] A conical structure, wherein the conical structure is fixed in the cavity, the conical structure is directly opposite to the light incident port, and the conical structure is used to absorb light at the light incident port;

[0012] A reflector, the reflector is located on the inner wall of the cavity and fixed in the cavity, the reflector is used to receive the light emitted from the cone structure, and the reflector can reflect the light onto the triangle group;

[0013] The light passes through the cone structure and the reflector from the light incident port in sequence, and then reaches the triangle group.

[0014] Optionally, the cavity includes a rectangular inner cavity and a trapezoidal inner cavity;

[0015] The inner cavity of the rectangular parallelepiped is used to fix the triangular body group, and the opening end of the inner cavity of the rectangular parallelepiped is provided with the light entrance port and the triangular body group;

[0016] The inner cavity of the trapezoidal body contains a cone structure, and the inner side wall of the inner cavity of the trapezoidal body is provided with the reflector, which is connected with the cone structure.

[0017] Optionally, the cone tip of the cone structure is opposite to the geometric center of the light entrance port of the cavity, and the light can be focused at the cone tip of the cone structure, so that the cone structure can concentrate the light and produce a stronger light beam.

[0018] Optionally, a spiral groove is provided on the outer wall of the conical structure, and a threaded structure is provided on the spiral groove. The threaded structure is made of glass. A layer of anodized black sandblasting is first sprayed on the conical structure and the threaded structure, and then a high-absorption black light-absorbing paint is coated on the conical structure and the threaded structure. The light is scattered by the outer wall of the conical structure and the threaded structure, so that the light diverges or scatters in different directions. The cross-section of the conical structure gradually increases from the inner cavity of the rectangular parallelepiped to the inner cavity of the trapezoidal body.

[0019] Optionally, the thread structure has SM05 optical threads.

[0020] Optionally, the triangle groups are arranged in pairs, two triangles form a pair of triangle groups, the two pairs of triangle groups are symmetrically arranged about the center line of the cavity, the cross-section of the triangle is an equilateral triangle, and in a pair of triangle groups, the side length of the triangle multiplied by the number of triangles is equal to the length of the inner wall of the rectangular inner cavity of the rectangular inner cavity.

[0021] Optionally, the inner wall of the inner cavity of the cuboid is coated with black light-absorbing paint.

[0022] Optionally, the outer wall of the triangle group is painted with black light absorbing paint.

[0023] Optionally, the angle between the reflector and the center line of the cavity ranges from -10° to -20° or from 10° to 20°.

[0024] Optionally, the conical structure is connected to a glass base, the glass base is far away from the light incident port, the ratio of the height of the conical structure to the bottom circle radius of the cone tip away from the conical structure is 5:2, the bottom circle diameter is the same as the diameter of the glass base, and the circumference of the end face circle of the glass base away from the light incident port is close to the reflector.

[0025] Beneficial effects of the present invention:

[0026] In the present invention, a portion of stray light is scattered onto the reflector through the outer wall of the cone structure, and then reflected onto the triangle group, and then most of it is absorbed by the triangle group, and a small portion of stray light that is not absorbed will be continuously reflected in the triangle group until it is finally absorbed by the triangle group. Specifically, a portion of stray light is focused by the cone tip of the cone structure, and the light beam in the cone structure is projected onto the reflector, and the reflector is reflected again, and the stray light is reflected onto the triangle group, and then most of it is absorbed by the triangle group, and a small portion of stray light that is not absorbed will be continuously reflected in the triangle group until it is finally absorbed by the triangle group. Another portion of stray light will be absorbed by the threaded structure on the cone. The structure of the present invention is subtle, and can not only meet the needs of the very early equipment overheating detection system for light traps, the cone structure can achieve efficient collection and focusing of light, and it also has the advantages of small size, simple manufacturing, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a cross-sectional structural diagram of the present invention;

[0029] Figure 2 It is a three-dimensional structural diagram of the cone structure of the present invention;

[0030] Figure 3 It is a three-dimensional structural diagram of the triangular body group structure of the present invention;

[0031] Figure 4 It is the overall three-dimensional structure diagram of the present invention.

[0032] Description of the drawings: 1-light input port, 2-triangle group, 3-cavity wall, 4-conical structure, 41-spiral groove, 5-thread structure, 6-inner wall of the rectangular cavity, 7-reflector, 8-outer wall of the triangle group, 9-glass base, A-rectangular cavity, B-trapezoidal cavity, C-cavity. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0034] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be welding, bolt connection, or riveting; it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] Example 1

[0038] like Figure 1As shown, a light trap structure for a micro laser provided in this embodiment includes: a cavity C, a triangular body group 2, a conical structure 4, a reflector 7 and a top cover, and the top cover can cover the top of the entire light trap structure (i.e., the light input port 1 end, which is convenient for shielding). Cavity C has a cavity wall 3, and cavity C is composed of a rectangular inner cavity A and a trapezoidal inner cavity B. The rectangular inner cavity A is for the convenience of fixing the triangular body group 2. The opening end of the rectangular inner cavity A has a laser light input port 1. The conical structure 4 is arranged in the trapezoidal inner cavity B, and the triangular body group 2 is arranged at the opening end of the rectangular inner cavity A (the light input port 1 end). The triangular body group 2 is convenient for receiving stray light reflected by the reflector 7. The reflector 7 is arranged on the two inner side walls of the trapezoidal inner cavity B. The conical structure 4 is directly opposite to the geometric center of the light input port 1 of the cavity C and is fixed in the cavity C; wherein, the triangular body group 2 is fixed in the cavity C, and the reflector 7 is fixed on the side wall of the trapezoidal inner cavity B of the cavity C, and is fixed in the cavity C.

[0039] like Figure 1 As shown, in this embodiment, the cone tip of the cone structure 4 is aligned with the geometric center of the light entrance port 1 of the cavity C, so that the light can be focused by the cone tip, thereby concentrating the light to produce a stronger light beam. Figure 2 As shown, a spiral groove 41 is formed on the outer wall of the cone structure 4, and a thread structure 5 is formed on the spiral groove 41. The thread structure 5 can be made of glass. The cone structure 4 and the thread structure 5 are first sprayed with a layer of anodized black sandblasting to improve the wear resistance and corrosion resistance of the cone structure 4 and the thread structure 5 and increase the surface roughness, which is beneficial to increase the adhesion of the coating. Then, a black light-absorbing paint with high absorption rate is applied to the cone structure 4 and the thread structure 5 (generally, black light-absorbing paint has high absorption rate because black itself absorbs light) to absorb light. The light is scattered by the outer side of the cone structure 4 and the thread structure 5 can also scatter the light, so that the light diverges in different directions. The cross section of the cone structure 4 gradually increases from the inner cavity A of the rectangular parallelepiped to the inner cavity B of the trapezoid.

[0040] like Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, there are two groups of triangular body groups 2, wherein two triangular bodies form a group or a pair of triangular body groups 2, each group of triangular body groups 2 has two triangular bodies, and the cross section of the triangular body is an equilateral triangle, and the side length of each triangular body multiplied by the number of triangular bodies in each group of triangular body groups 2 is equal to the length of the inner wall 6 of the cuboid inner cavity A of the cuboid inner cavity. The side length of the equilateral triangle of the triangular body is generally 1mm-3mm. Two adjacent equilateral triangles can make the light reflect in the triangular body group 2 until the light disappears.

[0041] In this embodiment, the reflector 7 is a low reflector, which is one of anti-reflection glass, non-reflection glass or anti-glare glass, and the reflectivity of the reflector 7 is less than 5%. Since the reflectivity of the low reflector 7 is very low, the reflected radiation energy is greatly reduced compared with the original, which increases the loss of light energy. The low reflector 7 is a mirror reflection with a smooth surface.

[0042] In this embodiment, the ratio of the height of the cone structure 4 to the radius of the bottom circle (i.e., the circle at the bottom end of the cone structure 4) away from the cone tip (the top of the cone structure 4) is 5:2, which allows the incident light to complete basically ideal diffuse reflection on the threaded structure 5 of each cone structure 4.

[0043] In this embodiment, the conical structure 4 is connected to the glass base 9, the glass base 9 is far away from the light incident port 1, the bottom circle diameter of the bottom end of the conical structure 4 is the same as the diameter of the glass base 9, the glass base 9 is a cylinder, and the end face circle circumference of the glass base 9 far away from the light incident port 1 (that is, the bottom end circle of the glass base 9, the top end circle of the glass base 9 is connected to the conical structure 4) is close to the reflector 7, so that basically all the received light will pass through the conical structure 4.

[0044] In this embodiment, a thread structure 5 is provided on the side of the conical structure 4 . The thread structure 5 is an SM05 optical thread. The thread structure 5 can participate in the absorption of laser.

[0045] In this embodiment, the angle between the reflector 7 and the center line of the cavity C ranges from -10° to -20° or from 10° to 20°.

[0046] In this embodiment, the outer wall 8 of the triangle group is coated with a light-absorbing paint, and the light-absorbing paint should be a black paint with a high absorption rate.

[0047] In this embodiment, the inner wall 6 of the inner cavity of the cuboid is coated with a light-absorbing paint, and the light-absorbing paint should be a black paint with a high absorption rate.

[0048] In this embodiment, the overall length of the cavity C does not exceed 10 mm.

[0049] In this embodiment, the opening end of the rectangular inner cavity A has a laser light input port 1, and the opening of the laser light input port 1 is rectangular with a width of 4 mm and a height of 5 mm.

[0050] Example 2

[0051] Based on Example 1, assuming that the energy entering the light trap is 100, after diffuse reflection by the cone structure 4, the light energy leaked out is 100×0.05×0.01=0.05; after at least one reflection by the reflector 7, the remaining energy does not exceed 0.0025. Since part of the light energy will be absorbed by the thread structure 5 on the cone structure 4, or a certain proportion of the overflow needs to be reflected multiple times, the leakage of this part can be about 0.0001, that is, the absorption rate can reach 0.999999.

[0052] Example 3

[0053] Based on all the above embodiments, in the present invention, light rays pass through the cone structure 4 and the reflector 7 in sequence from the light incident port 1 and then reach the triangle group 2 .

[0054] The conical tip of the conical structure 4 is aligned with the geometric center of the light entrance port 1 of the cavity C, so that the light can be focused by the conical tip, and the conical structure 4 concentrates or absorbs the light to produce a stronger light beam. The light in the conical structure 4 is scattered by the outer wall of the conical structure 4 and the threaded structure 5, so that the light diverges in different directions.

[0055] Since the radiation energy reflected by the reflector 7 is greatly reduced compared with the original, the loss of light energy is increased. The low reflector 7 is a mirror reflection with a smooth surface.

[0056] Finally, the light can be reflected in the triangle group 2 by the adjacent equilateral triangles until the light disappears. The light absorbing coating on the inner wall 6 of the inner cavity of the cuboid can also further enhance the absorption of the light in the cone structure 4 after scattering.

[0057] Therefore, the light trap structure for a micro laser provided by an embodiment of the present invention greatly reduces the proportion of diffuse light escaping and improves the light trap's absorption rate of light. It can not only meet the demand for light traps in very early equipment overheating detection systems and achieve efficient collection and focusing of light, but also has the advantages of small size, simple manufacturing and low cost.

[0058] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A light trap structure for micro laser, characterized in that: include: A cavity (C), wherein a light input port (1) is provided on the cavity (C); A triangular body group (2), the triangular body group (2) is located at the light entrance port (1) of the cavity (C), and the triangular body group (2) is fixed in the cavity (C), and the triangular body group (2) is used to consume the light in the cavity (C); A conical structure (4), wherein the conical structure (4) is fixed in the cavity (C), the conical structure (4) is directly opposite to the light incident port (1), and the conical structure (4) is used to absorb light at the light incident port (1); a reflector (7), the reflector (7) being located on the inner side wall of the cavity (C) and fixed in the cavity (C), the reflector (7) being used to receive light emitted from the conical structure (4), and the reflector (7) being capable of reflecting the light onto the triangular body group (2); The light enters the light input port (1) and passes through the cone structure (4) and the reflector (7) in sequence before reaching the triangular body group (2).

2. The optical trap structure for micro laser according to claim 1, characterized in that: The cavity (C) includes a rectangular inner cavity (A) and a trapezoidal inner cavity (B); The rectangular inner cavity (A) is used to fix the triangular body group (2), and the open end of the rectangular inner cavity (A) is provided with the light input port (1) and the triangular body group (2); The conical structure (4) is accommodated inside the inner cavity (B) of the trapezoidal body, and the reflector (7) is arranged on the inner side wall of the inner cavity (B) of the trapezoidal body, and the reflector (7) is connected to the conical structure (4).

3. The optical trap structure for micro laser according to claim 1, characterized in that: The cone tip of the cone structure (4) is located at the geometric center of the light entrance port (1) of the cavity (C), and light can be focused at the cone tip of the cone structure (4), so that the cone structure (4) can concentrate the light and produce a stronger light beam.

4. The optical trap structure for micro laser according to claim 1, characterized in that: The outer wall of the conical structure (4) is provided with a spiral groove (41), and the spiral groove (41) is provided with a thread structure (5), and the thread structure (5) is made of glass. A layer of anodized black sandblasting is first sprayed on the conical structure (4) and the thread structure (5), and then a black light-absorbing paint with a high absorption rate is coated on the conical structure (4) and the thread structure (5). Light is scattered through the outer wall of the conical structure (4) and the thread structure (5), so that the light is diverged or scattered in different directions. The cross section of the conical structure (4) gradually increases from the inner cavity (A) of the rectangular parallelepiped to the inner cavity (B) of the trapezoid.

5. The optical trap structure for micro laser according to claim 1, characterized in that: The thread of the thread structure (5) is an SM05 optical thread.

6. The optical trap structure for micro laser according to claim 4, characterized in that: The triangular body groups (2) are arranged in pairs, two triangular bodies form a pair of triangular body groups (2), the two pairs of triangular body groups (2) are symmetrically arranged about the center line of the cavity (C), the cross-section of the triangular body is an equilateral triangle, and in a pair of triangular body groups (2), the side length of the triangular body multiplied by the number of triangular bodies is equal to the length of the inner wall (6) of the rectangular inner cavity (A) of the rectangular inner cavity.

7. The optical trap structure for micro laser according to claim 6, characterized in that: The inner wall (6) of the inner cavity of the cuboid is coated with black light-absorbing paint.

8. The optical trap structure for micro laser according to claim 6, characterized in that: The outer wall (8) of the triangle group is coated with black light-absorbing paint.

9. The optical trap structure for micro laser according to claim 1, characterized in that: The angle between the reflector (7) and the center line of the cavity (C) ranges from -10° to -20° or from 10° to 20°.

10. The optical trap structure for micro laser according to claim 1, characterized in that: The conical structure (4) is connected to a glass base (9), the glass base (9) is far away from the light input port (1), the ratio of the height of the conical structure (4) to the radius of the bottom circle of the cone tip far away from the conical structure (4) is 5:2, the diameter of the bottom circle is the same as the diameter of the glass base (9), and the circumference of the end surface of the glass base (9) far away from the light input port (1) is close to the reflector (7).

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