Laser directivity test structure

Abstract

The utility model discloses a laser directivity test structure which comprises a laser, an Airy spot generation module and an optical screen. The laser is used for generating laser; the Airy spot generation module is used for receiving the laser and enabling the laser to be diffracted so as to generate Airy spots and imaging the Airy spots on the optical screen, so that the change condition of the laser along with time is reflected through the deviation degree of the dark spot center of the Airy spots and the center of the optical screen; wherein at the initial time, the dark spot center of the Airy spot is aligned with the center of the optical screen, and the position of the Airy spot on the optical screen changes along with the change of the directivity of the laser. By utilizing the structure, the laser directivity is more accurately determined by generating the Airy spot and observing the deviation degree between the dark spot center of the high-resolution Airy spot and the center of the optical screen, and the laser directivity detection device is simple in structure, easy to integrate and wide in application range.

Description

Technical Field

[0001] The utility model relates to the technical field of lasers, in particular to a laser directivity testing structure. Background Art

[0002] Laser pointing stability is one of the important indicators of laser parameters. It is described as the degree of laser pointing deviation within a period of time after the laser is emitted. If the laser beam emitted within a period of time deviates too much in space, it means that the pointing is poor, and vice versa. There are many factors that affect the quality of laser pointing, such as mechanical stress, thermal effects, and pump light deviation. During the application of the laser, the deviation of the emitted laser will cause changes in the subsequent optical path testing or debugging, which will lead to poor performance of the entire device. Even a large optical path deviation can cause the laser to be incident on flammable devices inside the entire device, causing a fire. Therefore, before the laser is applied, testing the laser pointing is a necessary part of laser testing.

[0003] Existing tests for laser directivity typically use CCD testing. While this method facilitates observing changes in the optical path, it requires a larger number of external optical paths to attenuate the laser power. Higher laser power requires more components, which can make it difficult to distinguish between optical path deviations caused by the external optical path and those caused by internal laser factors, leading to misjudgments. Furthermore, the light spot collected by the CCD test method typically conforms to a Gaussian distribution, resulting in a larger spot size and lower resolution. This can lead to misjudgments when determining laser directivity based on the degree of light spot deviation. Utility Model Content

[0004] The utility model provides a laser directivity test structure, which generates an Airy disk and observes the degree of deviation between the dark spot center of the high-resolution Airy disk and the center of the light screen, so as to accurately determine the quality of the laser directivity. The utility model has a simple structure, is easy to integrate, and has a wide range of applications.

[0005] The utility model provides a laser directivity test structure, comprising a laser, an Airy disk generating module and a light screen;

[0006] Lasers are used to generate laser light;

[0007] The Airy disk generation module is used to receive laser light and diffract the laser light to generate an Airy disk, which is imaged on a light screen. The Airy disk reflects the change of the laser over time through the degree of offset between the center of the dark spot of the Airy disk and the center of the light screen. Among them, at the initial time, the center of the dark spot of the Airy disk is aligned with the center of the light screen, and the position of the Airy disk on the light screen changes with the directivity of the laser.

[0008] Optionally, the Airy disk generating module includes a pinhole stop;

[0009] The aperture diaphragm is coaxial with the laser.

[0010] Optionally, the diameter of the pinhole aperture is smaller than the spot diameter of the laser.

[0011] Optionally, the Airy disk generating module further includes a focusing lens;

[0012] The focusing lens is located between the pinhole diaphragm and the light screen and is coaxial with the pinhole diaphragm and the laser.

[0013] Optionally, the focusing lens includes a telephoto lens.

[0014] Optionally, the light screen is a cross light receiving card.

[0015] Optionally, the structure further includes a CCD camera;

[0016] The CCD camera is located on the receiving surface of the Airy disk and is used to collect the Airy disk and generate real-time image information to determine the degree of deviation between the dark spot center of the Airy disk and the center of the light screen.

[0017] The technical solution of this utility model transmits laser light generated by a laser to an Airy disk generation module, which diffracts the laser light, generating an Airy disk that is imaged on a light screen. By aligning the center of the dark spot of the Airy disk with the center of the light screen at the initial moment and observing the degree of offset between the dark spot center of the Airy disk and the center of the light screen over a preset time period, the laser's directivity can be more accurately and quickly determined. This simple structure allows for easy integration and a wide range of applications.

[0018] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

[0020] Figure 1 A schematic diagram of a laser directivity test structure provided by an embodiment of the present utility model;

[0021] Figure 2 A schematic diagram of the structure of an Airy disk provided in an embodiment of the present utility model;

[0022] Figure 3 This is a structural schematic diagram of a second laser directivity test structure provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0023] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0025] In one embodiment, Figure 1 A schematic diagram of a laser directivity test structure provided by an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of an Airy disk provided by an embodiment of the utility model. This embodiment is applicable to the situation where the high-resolution spot of the Airy disk is used to accurately determine the directionality of the laser. Figure 1 and Figure 2 As shown, the structure includes a laser 1, an Airy disk generating module 2 and a light screen 3; the laser 1 is used to generate laser light; the Airy disk generating module 2 is used to receive the laser light and diffract the laser light to generate an Airy disk, which is imaged on the light screen 3, so as to reflect the change of the laser 1 over time through the degree of deviation between the center of the dark spot of the Airy disk and the center of the light screen 3; wherein, at the initial time, the center of the dark spot of the Airy disk is aligned with the center of the light screen 3, and the position of the Airy disk on the light screen 3 changes with the change of the directivity of the laser 1.

[0026] The laser 1 is a device for generating laser light. The Airy disk generating module 2 includes a pinhole aperture. The laser light generated by the laser 1 will diffract after passing through the pinhole aperture, generating a series of ring-shaped light spots on the focal plane, namely the Airy disk. Figure 2 The center of the Airy disk is a very obvious dark spot. Screen 3 is set on the focal plane of the Airy disk to display the Airy disk. Screen 3 is a cross-shaped light-collecting plate. The cross at the center can determine the degree of offset of the dark spot center of the Airy disk.

[0027] Specifically, when testing the directivity of a laser, laser 1 can be used to generate laser light. The generated laser light is then sent to Airy disk generation module 2. Airy disk generation module 2 receives the laser light generated by laser 1 and diffracts the laser light, forming a series of annular light spots, i.e., an Airy disk with a dark spot at its center. The Airy disk is ultimately displayed on screen 3. Based on background information, the directivity of laser 1 can be determined based on the degree of laser light deviation over a period of time. In this embodiment, at the initial moment, the center of the dark spot of the Airy disk is aligned with the center of screen 3. Since the Airy disk is formed by the diffraction of the laser light generated by laser 1, when the directivity of the laser light emitted by laser 1 shifts, the corresponding position of the Airy disk on screen 3 will also change with the change in the directivity of laser 1. Therefore, by observing the degree of deviation between the center of the dark spot of the Airy disk and the center of screen 3 over a preset time period, the temporal changes of laser 1 can be determined. Based on this change in laser 1, the directivity of laser 1 can be determined. When the degree of offset between the center of the dark spot of the Airy disk and the center of the light screen 3 during a preset time period is within a preset offset error range, it indicates that the laser 1 has not changed significantly over time and has good directivity. Conversely, when the degree of offset between the center of the dark spot of the Airy disk and the center of the light screen 3 during a preset time period is outside the preset offset error range, it indicates that the laser 1 has changed significantly over time and has poor directivity, and the laser 1 needs to be debugged and repaired.

[0028] It should be noted that the reason why the present application uses the generation of the Airy disk to determine the directionality of the laser 1 is because the Airy disk has a small spot size, high resolution, and the center of the Airy disk is an obvious dark spot. When the Airy disk is offset, the degree of offset of the center of the dark spot of the Airy disk relative to the center of the light screen 1 can be observed more accurately, thereby more quickly and accurately determining the directionality of the laser 1 and determining the performance of the laser 1.

[0029] The technical solution of the present embodiment involves transmitting laser light generated by a laser to an Airy disk generation module, which diffracts the laser light, generating an Airy disk that is then imaged on a light screen. This structure aligns the center of the dark spot of the Airy disk with the center of the light screen at the initial moment. By observing the degree of offset between the dark spot center of the Airy disk and the center of the light screen over a preset time period, the laser's directivity can be more accurately and quickly determined. This system features a simple structure, is easily integrated, and has a wide range of applications.

[0030] Optional, Figure 3 The schematic diagram of the second laser directivity test structure provided by the embodiment of the present invention is shown in FIG. Figure 3 As shown, the Airy disk generating module 2 includes a pinhole stop 32 ; the pinhole stop 32 is coaxial with the laser.

[0031] The pinhole diaphragm 21 is an optical element that limits the laser beam through a very small hole. In this embodiment, the diameter of the pinhole diaphragm 21 is set smaller than the laser spot diameter so that the laser light can be diffracted after passing through the pinhole diaphragm 21, forming a series of annular light spots.

[0032] Optional, continue to refer to Figure 3 The Airy disk generating module 2 further includes a focusing lens 22 ; the focusing lens 22 is located between the pinhole aperture 21 and the light screen 3 , and is coaxial with the pinhole aperture 21 and the laser.

[0033] Optionally, the focusing lens 22 includes a telephoto lens.

[0034] The focusing lens 22 is used to focus the diffracted laser light. In this embodiment, the optical axis of the focusing lens 22 is aligned with the optical axes of the pinhole aperture 21 and the laser light. This ensures that the diffracted laser light is focused after passing through the focusing lens 22 and forms an Airy disk on the light screen 3.

[0035] Optionally, the structure further includes a CCD camera (not shown in the figure); the CCD camera is located on the receiving surface of the Airy disk, and is used to collect the Airy disk and generate real-time image information to determine the degree of offset between the dark spot center of the Airy disk and the center of the light screen 3.

[0036] The CCD camera is used to collect the Airy disk and display the image information of the Airy disk on the display screen of the CCD camera, so that the user can determine the directionality of the laser 1 by observing the degree of deviation between the dark spot center of the Airy disk and the center of the light screen 3.

[0037] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this utility model can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this utility model can be achieved. This is not limited herein.

[0038] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A laser directivity test structure, characterized in that: Includes laser, Airy disk generating module and light screen; The laser is used to generate laser light; The Airy disk generating module is used to receive the laser and diffract the laser to generate an Airy disk, which is imaged on the light screen. The Airy disk reflects the change of the laser over time through the degree of deviation between the center of the dark spot of the Airy disk and the center of the light screen. At the initial time, the center of the dark spot of the Airy disk is aligned with the center of the light screen, and the position of the Airy disk on the light screen changes with the directivity of the laser.

2. The structure according to claim 1, characterized in that The Airy disk generation module includes a pinhole diaphragm; The pinhole stop is coaxial with the laser.

3. The structure according to claim 2, characterized in that The diameter of the pinhole aperture is smaller than the spot diameter of the laser.

4. The structure according to claim 2, characterized in that The Airy disk generation module further includes a focusing lens; The focusing lens is located between the pinhole stop and the light screen, and is coaxial with the pinhole stop and the laser.

5. The structure according to claim 4, characterized in that The focusing lens includes a telephoto lens.

6. The structure according to claim 1, characterized in that The light screen is a cross light receiving card.

7. The structure according to claim 1, characterized in that Also includes a CCD camera; The CCD camera is located on the receiving surface of the Airy disk and is used to collect the Airy disk and generate real-time image information to determine the degree of deviation between the dark spot center of the Airy disk and the center of the light screen.

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