阅读说明：本技术 一种大视场高功率激光光束质量检测方法 (Large-view-field high-power laser beam quality detection method ) 是由 刘成武 于 2021-07-21 设计创作，主要内容包括：本发明涉及激光光束质量检测技术领域,具体地说,涉及一种大视场高功率激光光束质量检测方法。其包括以下步骤：反射角度调整、衍射孔洞大小调节、环境模拟、激光强度调节、激光照射启动、光斑采集、光束质量计算。本发明提前对反射镜、光斑显示板和衍射洞口进行调节,使在实验时,减少激光实验的未知量,同时控制已知量数据的稳定性,进而保证激光实验的准确性,降低实验人员获得激光发散角和光束质量数据的难度,同时通过设置的多个反射镜对激光进行折射,降低激光实验的空间,降低不定性的因数,进一步的提高激光实验的稳定性,保证激光实验获得数据的准确性。(The invention relates to the technical field of laser beam quality detection, in particular to a large-view-field high-power laser beam quality detection method. Which comprises the following steps: reflection angle adjustment, diffraction hole size adjustment, environment simulation, laser intensity adjustment, laser irradiation starting, light spot collection and light beam quality calculation. The invention adjusts the reflector, the facula display panel and the diffraction opening in advance, reduces the unknown quantity of the laser experiment during the experiment, controls the stability of the known quantity data, further ensures the accuracy of the laser experiment, reduces the difficulty of experimenters for obtaining the laser divergence angle and the light beam quality data, refracts the laser through the plurality of reflectors, reduces the space of the laser experiment, reduces the uncertainty factor, further improves the stability of the laser experiment, and ensures the accuracy of the laser experiment for obtaining the data.)

1. A quality detection method for a large-field-of-view high-power laser beam comprises the following steps:

s1, reflection angle adjustment: in a vacuum environment, debugging the angle of laser reflection in advance;

s2, adjusting the size of the diffraction hole: adjusting a diffraction hole for shielding laser;

s3, environmental simulation: simulating each particle environment of laser in real use;

s4, laser intensity adjustment: testing the refraction angles of the laser with different intensities in different environments and the same environment;

s5, laser irradiation start: turning on the laser;

s6, light spot collection: carrying out imaging collection on the light plate after laser diffraction, and counting the density degree of light spots;

s7, calculating the beam quality: and calculating and measuring the central divergence angle of the light spot with the maximum brightness in the light spots to obtain the laser beam quality of the laser in different scenes.

2. The large-field-of-view high-power laser beam quality detection method according to claim 1, characterized in that: the step of adjusting the reflection angle in the reflection angle adjusting step is as follows:

s1.1, adjusting positions of a reflector group and a light spot display screen: the reflector group consists of a plurality of reflectors with different sizes, the reflectors are arranged from small to large, the smallest reflector is arranged at the position closest to the laser projection point, and the light spot display screen is arranged at one side of the largest reflector;

s1.2, setting the distance between the opposite reflectors and the angle of a laser projection point: determining the projection angle of the laser projection point, and adjusting the distance between the plurality of reflectors according to the reflection angle of the laser on the reflectors, so that the laser refraction point of the reflector is positioned on the central point of each reflector, and the light panel display screen and the laser reflected by the last reflector are vertically arranged.

3. The large-field-of-view high-power laser beam quality detection method according to claim 2, characterized in that: in the size adjustment of the diffraction holes, the diffraction plate is used for diffracting laser emitted by the laser projection point, the diffraction holes in the diffraction plate are circular, the diffraction plate is made of opaque materials, and the diffraction plate is arranged between the laser projection point and the first reflecting mirror.

4. The large-field-of-view high-power laser beam quality detection method according to claim 1, characterized in that: in the environment simulation, an atomizer is adopted to spray atomized particles in a laser-irradiated vacuum environment so as to form scenes with different particle contents.

5. The large-field-of-view high-power laser beam quality detection method according to claim 1, characterized in that: the light spot acquisition step comprises the following steps:

s6.1, measuring the laser irradiation distance L;

s6.2, counting the diffraction number n of the light spots;

s6.3, recording the numerical value of the particle content eta in the laser irradiation environment;

s6.4, measuring the radius R of the light spot and the distance R from the central point of the light spot to the central point of the light spot display plate.

6. The large-field-of-view high-power laser beam quality detection method according to claim 5, characterized in that: in the beam quality calculating step, the data collected in the beam spot collecting step is processed, and the formula is as follows:

wherein beta is a diffraction limit factor, theta₁For the actual far field divergence angle of the beam, θ₀Is the far field divergence angle theta of the light beam under the ideal state₀1.22 λ/D, where D is the diameter of the hole in the diffraction plate and λ is the wavelength of the laser.

7. The large-field-of-view high-power laser beam quality detection method of claim 6, wherein: after calculating the laser beam quality, in order to obtain the angle range of the diffracted light spot, the formula is as follows:

θ₂≥θ_{light spot}≥2θ₁-θ₂

Wherein, theta₂For the maximum refraction angle, θ, at which the laser light is refracted to the edge of the spot_{Light spot}The refractive angle values for the spots illuminated on the spot display panel.

Technical Field

The invention relates to the technical field of laser beam quality detection, in particular to a large-view-field high-power laser beam quality detection method.

Background

Since the advent of laser, laser has been widely used in the fields of information, processing, medical treatment, military and the like because of its characteristics of high brightness, high directivity, high monochromaticity and high coherence, and in the manufacturing industry, it can be used as a high-intensity light source for cutting, punching, welding and the like. The laser weapon can be used for vehicle-mounted and ship-mounted laser weapons in the military field, can also be used as a beacon light source of the laser weapons, and has wide application in the fields of photoelectric countermeasure, laser guidance, laser-induced nuclear fusion and the like. Among the various high power lasers, fiber lasers have been developed particularly rapidly with their advantages of good beam quality, small size, high conversion efficiency, good heat dissipation, etc., and have begun to be applied in industrial and military fields on a large scale. With the further application of the laser, the working conditions of different environments in which the laser works are subjected to an accounting experiment, so that divergence angle data of the laser in different environments can be obtained conveniently. A

At present when the numerical value of the divergence angle of laser under different environment in the laser experiment to big visual field, the distance that laser will shine is big, it is experimental space big, the laser refracting index is high, the angle of divergence is big, can't be fine to the divergence angle of laser and the light beam quality of laser experiment, experimental space is big simultaneously, its indefinite factor will be more, and then lead to the anti divergence angle of laser and the data that the light beam quality of laser detected inaccurate easily, thereby increase the experimenter and to data determination time, increase the degree of difficulty that the experimenter obtained laser divergence angle and light beam quality data.

Disclosure of Invention

The invention aims to provide a quality detection method for a large-field-of-view high-power laser beam, which aims to solve the problems in the background technology.

In order to achieve the above purpose, the invention provides a quality detection method for a large-field high-power laser beam, which comprises the following steps:

s1, reflection angle adjustment: in a vacuum environment, debugging the angle of laser reflection in advance; the laser irradiation range is conveniently increased in a limited space;

s2, adjusting the size of the diffraction hole: adjusting a diffraction hole for shielding laser; so as to adjust the diffracted holes according to different irradiation requirements and expand the laser diffraction range;

s3, environmental simulation: simulating each particle environment of laser in real use; so as to test the irradiation and deflection angles of the laser under different particle environments;

s4, laser intensity adjustment: testing the refraction angles of the laser with different intensities in different environments and the same environment;

s5, laser irradiation start: turning on the laser;

s6, light spot collection: carrying out imaging collection on the light plate after laser diffraction, and counting the density degree of light spots;

s7, calculating the beam quality: and calculating and measuring the central divergence angle of the light spot with the maximum brightness in the light spots to obtain the laser beam quality of the laser in different scenes.

As a further improvement of the present technical solution, the step of adjusting the reflection angle in the reflection angle adjusting step is as follows:

s1.1, adjusting positions of a reflector group and a light spot display screen: the reflector group consists of a plurality of reflectors with different sizes, the reflectors are arranged from small to large, the smallest reflector is arranged at the position closest to the laser projection point, and the light spot display screen is arranged at one side of the largest reflector;

s1.2, setting the distance between the opposite reflectors and the angle of a laser projection point: determining the projection angle of the laser projection point, and adjusting the distance between the plurality of reflectors according to the reflection angle of the laser on the reflectors, so that the laser refraction point of the reflector is positioned on the central point of each reflector, and the light panel display screen and the laser reflected by the last reflector are vertically arranged.

As a further improvement of the technical scheme, in the size adjustment of the diffraction holes, the diffraction plate is used for diffracting laser emitted by the laser projection point, the diffraction holes in the diffraction plate are circular, the diffraction plate is made of opaque materials, and the diffraction plate is arranged between the laser projection point and the first reflecting mirror.

As a further improvement of the technical scheme, an atomizer is adopted to spray atomized particles in a laser-irradiated vacuum environment in the environment simulation so as to form scenes with different particle contents.

As a further improvement of the technical scheme, the light spot acquisition step comprises the following steps:

s6.1, measuring the laser irradiation distance L;

s6.2, counting the diffraction number n of the light spots;

s6.3, recording the numerical value of the particle content eta in the laser irradiation environment;

s6.4, measuring the radius R of the light spot and the distance R from the central point of the light spot to the central point of the light spot display plate.

As a further improvement of the technical solution, in the step of calculating the beam quality, the data collected in the step of collecting the light spot is processed, and the formula is as follows:

wherein beta is a diffraction limit factor, theta₁For the actual far field divergence angle of the beam, θ₀Is the far field divergence angle theta of the light beam under the ideal state₀1.22 λ/D, where D is the diameter of the hole in the diffraction plate and λ is the wavelength of the laser light; when theta is₁The larger the value of (A), the larger the angle of refraction of the laser in the setting environment, and further the smaller the value of beta, the lower the beam quality of the laser in the setting environment, when theta₁The smaller the value of (b), the smaller the angle of refraction of the laser in the setting environment, and the smaller the value of beta, indicating the higher the beam quality of the laser in the setting environment.

As a further improvement of the present technical solution, after calculating the quality of the laser beam, in order to obtain the angle range of the diffracted light spot, the formula is as follows:

θ₂≥θ_{light spot}≥2θ₁-θ₂

Wherein, theta₂For the maximum refraction angle, θ, at which the laser light is refracted to the edge of the spot_{Light spot}For irradiating at a light spotThe refraction angle value of the light spot on the display panel; when 2 theta is₁-θ₂The closer the value is to theta₂The smaller the refraction angle of the light spot is, the poorer the beam refractive index of the laser in the environment is, and the higher the beam quality is; when 2 theta is₁-θ₂Numerical sum theta₂The larger the numerical difference, the larger the refraction angle of the light spot, the higher the refractive index of the light beam of the laser in the environment, and the lower the quality of the light beam.

Compared with the prior art, the invention has the beneficial effects that:

1. in this big visual field high power laser beam quality detection method, the space setting through shining the laser is experimented in vacuum environment, makes the laser establish the in-process of shining, can not receive external environment's influence, improves the accurate numerical value of laser experimental data today, carries out the laser experiment in the vacuum simultaneously, is convenient for obtain the divergence angle under the most close ideal environment of laser to for the data in later stage decide the basis, the convenient going on of experiment at the back.

2. According to the quality detection method for the large-view-field high-power laser beam, through the experiment in the vacuum environment, the influence of the external environment is reduced, and meanwhile, particles with different concentrations are filled in the laser irradiation space in the vacuum environment, so that the laser divergence angle value in different environments and the beam quality of the laser in the environment are simulated, the data of the experiment of the laser in different environments are obtained, and the experiment of researchers on the laser is facilitated.

3. In the quality detection method for the large-view-field high-power laser beam, the reflector, the light spot display board and the diffraction opening are adjusted in advance, so that the unknown quantity of a laser experiment is reduced during the experiment, the stability of the known quantity data is controlled, the accuracy of the laser experiment is further ensured, and the difficulty of experimenters in obtaining laser divergence angles and beam quality data is reduced.

4. According to the quality detection method for the large-visual-field high-power laser beam, laser is refracted through the plurality of reflectors, the space of a laser experiment is reduced, the uncertainty factor is reduced, the stability of the laser experiment is further improved, and the accuracy of data obtained by the laser experiment is guaranteed.

Drawings

FIG. 1 is an overall step block diagram of embodiment 1 of the present invention;

fig. 2 is a reflection angle adjustment block diagram of embodiment 1 of the present invention;

fig. 3 is a block diagram of a light spot acquisition step in embodiment 1 of the present invention;

fig. 4 is a schematic diagram of a laser experimental structure in embodiment 1 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Example 1

The invention provides a quality detection method for a large-field high-power laser beam, which refers to fig. 1-4 and comprises the following steps:

s1, reflection angle adjustment: in a vacuum environment, debugging the angle of laser reflection in advance; the laser irradiation range is conveniently increased in a limited space;

the reflection angle adjustment of the reflection angle adjustment comprises the following steps:

s1.1, adjusting positions of a reflector group and a light spot display screen: the reflector group consists of a plurality of reflectors with different sizes, the reflectors are arranged from small to large, the smallest reflector is arranged at the position closest to the laser projection point, and the light spot display screen is arranged at one side of the largest reflector;

s1.2, setting the distance between the opposite reflectors and the angle of a laser projection point: determining the projection angle of the laser projection point, and adjusting the distance between the plurality of reflectors according to the reflection angle of the laser on the reflectors, so that the laser refraction point of the reflector is positioned on the central point of each reflector, and the light panel display screen and the laser reflected by the last reflector are vertically arranged.

S2, adjusting the size of the diffraction hole: adjusting a diffraction hole for shielding laser; so as to adjust the diffracted holes according to different irradiation requirements and expand the laser diffraction range;

in the process of adjusting the size of the diffraction hole, the diffraction plate is used for diffracting laser emitted by the laser projection point, the diffraction hole in the diffraction plate is circular, the diffraction plate is made of opaque materials, and the diffraction plate is arranged between the laser projection point and the first reflecting mirror.

S3, environmental simulation: simulating each particle environment of laser in real use; so as to test the irradiation and deflection angles of the laser under different particle environments;

the environment simulation adopts the atomizer to spray atomized particles in the laser-irradiated vacuum environment to form scenes with different particle contents, and the laser irradiates in the scenes with different particle contents so as to obtain the beam divergence condition of the laser in different environments and the beam quality of the laser in the environment.

S4, laser intensity adjustment: testing the refraction angles of the laser with different intensities in different environments and the same environment;

s5, laser irradiation start: turning on the laser;

s6, light spot collection: carrying out imaging collection on the light plate after laser diffraction, and counting the density degree of light spots;

the light spot acquisition comprises the following steps:

s6.1, measuring the laser irradiation distance L;

s6.2, counting the diffraction number n of the light spots;

s6.3, recording the numerical value of the particle content eta in the laser irradiation environment;

s6.4, measuring the radius R of the light spot and the distance R from the central point of the light spot to the central point of the light spot display plate.

S7, calculating the beam quality: and calculating and measuring the central divergence angle of the light spot with the maximum brightness in the light spots to obtain the laser beam quality of the laser in different scenes.

In the beam quality calculating step, the data collected in the beam spot collecting step is processed, and the formula is as follows:

wherein beta is a diffraction limit factor, theta₁For the actual far field divergence angle of the beam, θ₀Is the far field divergence angle theta of the light beam under the ideal state₀1.22 λ/D, where D is the diameter of the hole in the diffraction plate and λ is the wavelength of the laser light; when theta is₁The larger the value of (A), the larger the angle of refraction of the laser in the setting environment, and further the smaller the value of beta, the lower the beam quality of the laser in the setting environment, when theta₁The smaller the value of (b), the smaller the angle of refraction of the laser in the setting environment, and the smaller the value of beta, indicating the higher the beam quality of the laser in the setting environment.

After calculating the quality of the laser beam, in order to obtain the angle range of the diffracted light spot, the formula is as follows:

θ₂≥θ_{light spot}≥2θ₁-θ₂

Wherein, theta₂For the maximum refraction angle, θ, at which the laser light is refracted to the edge of the spot_{Light spot}Refraction angle values of the light spots irradiated on the light spot display panel; when 2 theta is₁-θ₂The closer the value is to theta₂The smaller the refraction angle of the light spot is, the poorer the beam refractive index of the laser in the environment is, and the higher the beam quality is; when 2 theta is₁-θ₂Numerical sum theta₂The larger the numerical difference, the larger the refraction angle of the light spot, the higher the refractive index of the light beam of the laser in the environment, and the lower the quality of the light beam.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.