阅读说明：本技术 一种半导体激光器远距离光斑的匀化方法 (Homogenization method for remote light spots of semiconductor laser ) 是由 罗山程 于 2021-01-23 设计创作，主要内容包括：本发明公开了一种半导体激光器远距离光斑的匀化方法,步骤一,通过激光器控制装置设定激光器的输出功率和光斑参数；步骤二,在激光加工系统的外光路中加入像散补偿装置,激光光束经过像散补偿装置后,产生像散；步骤三,沿激光光束方向采集激光光束的光斑图像；步骤四,根据采集的光斑图像采用背景减除法与阈值法进行预处理,得到预处理后的光斑图像。本发明提供一种较好的半导体激光器远距离光斑的匀化方法,避免整体机构较复杂,产品制作成本也相对降低,且采用此种方法体积也可相对较小,实现达到更好使用效果。(The invention discloses a homogenization method of a remote light spot of a semiconductor laser, which comprises the following steps that firstly, the output power and the light spot parameter of the laser are set through a laser control device; secondly, an astigmatism compensation device is added in an outer light path of the laser processing system, and laser beams generate astigmatism after passing through the astigmatism compensation device; collecting a light spot image of the laser beam along the direction of the laser beam; and step four, preprocessing the acquired light spot image by adopting a background subtraction method and a threshold value method to obtain a preprocessed light spot image. The invention provides a better homogenization method for the remote light spots of the semiconductor laser, which avoids the problems that the whole mechanism is more complicated, the manufacturing cost of the product is relatively reduced, and the volume can be relatively smaller by adopting the method, thereby achieving better use effect.)

1. A method for homogenizing a remote light spot of a semiconductor laser is characterized by comprising the following steps:

step one, setting output power and light spot parameters of a laser through a laser control device;

secondly, an astigmatism compensation device is added in an outer light path of the laser processing system, and laser beams generate astigmatism after passing through the astigmatism compensation device;

collecting a light spot image of the laser beam along the direction of the laser beam;

step four, preprocessing the acquired light spot image by adopting a background subtraction method and a threshold value method to obtain a preprocessed light spot image;

step five, calculating the laser spot center position of the preprocessed spot image;

sixthly, adjusting the rotation angle of an optical element in the astigmatism compensation device, changing the size and the direction of astigmatism generated by the astigmatism compensation device, enabling the astigmatism generated by the astigmatism compensation device to be equal to the astigmatism of the original laser processing system in size and opposite in direction, and performing reverse compensation on the astigmatism of the whole laser processing system;

and seventhly, storing the pixel gray values of the spot images of the laser spot center position in the horizontal direction and the vertical direction, then performing Gaussian curve fitting, calculating the variance of Gaussian fitting curves in the horizontal direction and the vertical direction, and obtaining the spot radius sizes of the spot images in the horizontal direction and the vertical direction according to the calculated variance.

And step eight, observing the ovality of the final light spot in the defocused state through a beam quality analyzer to adjust the astigmatism compensation device, wherein when the light spot in the defocused state is a circular light spot to the maximum extent, the rotating angle of the corresponding astigmatism compensation device is the required angle, and the compensation amount of the astigmatism compensation device is the astigmatism compensation value at the moment.

2. The method for homogenizing the distant spot of the semiconductor laser according to claim 1, wherein: the astigmatism compensation device adopts plate glass.

3. The method for homogenizing the distant spot of the semiconductor laser according to claim 1, wherein: the astigmatism compensation device adopts plate glass.

4. The method for homogenizing the distant spot of the semiconductor laser according to claim 1, wherein: and step three, specifically, constructing a light path system, and then collecting a light spot image of the laser beam along the optical axis direction by adopting a camera.

5. The method for homogenizing the distant spot of the semiconductor laser according to claim 1, wherein: the third step also comprises acquiring a background noise image through the camera.

Technical Field

The invention relates to a homogenization method of a remote light spot of a semiconductor laser, belonging to the technical field of semiconductor lasers.

Background

Semiconductor lasers, also known as laser diodes, are lasers that use semiconductor materials as the working substance. Due to the difference in material structure, the specific process of generating laser light in different types is special. Common working substances are gallium arsenide (GaAs), cadmium sulfide (CdS), indium phosphide (InP), zinc sulfide (ZnS), and the like. The excitation method includes three types of electric injection, electron beam excitation and optical pumping. Semiconductor laser devices can be classified into homojunctions, single heterojunctions, double heterojunctions, and the like. Most of the homojunction laser and the single heterojunction laser are pulse devices at room temperature, and the double heterojunction laser can realize continuous operation at room temperature.

In the prior art, to solve the problem of laser spots, for example, a braking mechanism (activator) such as a motor is usually added on the projection screen to drive the screen to move or rotate continuously, so as to destroy the coherence of the laser beam and reduce the interference phenomenon; or the lens is used for focusing the image generated by an image generating module on a movable or rotating Time-varying diffuser (Time-varying diffuser) to destroy the coherence of the laser and further alleviate the laser speckle phenomenon on the image picture. However, the aforementioned devices or methods use a braking mechanism to drive the screen or Diffuser (Time-varying Diffuser) to move or rotate relative to the laser, so the overall mechanism is complicated, the manufacturing cost of the product is relatively high, and the volume is relatively large. Therefore, a method for homogenizing a long-distance light spot of a semiconductor laser is urgently needed to solve the problem existing in the prior art.

In order to solve the technical problems, a new technical scheme is especially provided.

Disclosure of Invention

The invention aims to provide a method for homogenizing a remote light spot of a semiconductor laser, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a method for homogenizing a remote light spot of a semiconductor laser comprises the following steps:

step one, setting output power and facula parameters of a laser through a laser control device

Secondly, an astigmatism compensation device is added in an outer light path of the laser processing system, and laser beams generate astigmatism after passing through the astigmatism compensation device;

collecting a light spot image of the laser beam along the direction of the laser beam;

step four, preprocessing the acquired light spot image by adopting a background subtraction method and a threshold value method to obtain a preprocessed light spot image;

step five, calculating the laser spot center position of the preprocessed spot image;

sixthly, adjusting the rotation angle of an optical element in the astigmatism compensation device, changing the size and the direction of astigmatism generated by the astigmatism compensation device, enabling the astigmatism generated by the astigmatism compensation device to be equal to the astigmatism of the original laser processing system in size and opposite in direction, and performing reverse compensation on the astigmatism of the whole laser processing system;

and seventhly, storing the pixel gray values of the spot images of the laser spot center position in the horizontal direction and the vertical direction, then performing Gaussian curve fitting, calculating the variance of Gaussian fitting curves in the horizontal direction and the vertical direction, and obtaining the spot radius sizes of the spot images in the horizontal direction and the vertical direction according to the calculated variance.

And step eight, observing the ovality of the final light spot in the defocused state through a beam quality analyzer to adjust the astigmatism compensation device, wherein when the light spot in the defocused state is a circular light spot to the maximum extent, the rotating angle of the corresponding astigmatism compensation device is the required angle, and the compensation amount of the astigmatism compensation device is the astigmatism compensation value at the moment.

Preferably, the astigmatism compensation device is made of flat glass.

Preferably, the astigmatism compensation device is made of flat glass.

Preferably, the third step is to build a light path system, then collect the spot image of the laser beam along the optical axis direction by using a camera,

preferably, the third step further comprises acquiring a background noise image by a camera.

Compared with the prior art, the invention has the beneficial effects that: the method for homogenizing the remote light spots of the semiconductor laser is better, the problems that the whole mechanism is complex, the manufacturing cost of a product is relatively reduced, the size is relatively small due to the adoption of the method, and the better using effect is achieved.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without any creative efforts shall fall within the protection scope of the present invention.

The invention provides a technical scheme that: a method for homogenizing a remote light spot of a semiconductor laser comprises the following steps:

step one, setting output power and facula parameters of a laser through a laser control device

Secondly, an astigmatism compensation device is added in an outer light path of the laser processing system, and laser beams generate astigmatism after passing through the astigmatism compensation device;

collecting a light spot image of the laser beam along the direction of the laser beam;

step four, preprocessing the acquired light spot image by adopting a background subtraction method and a threshold value method to obtain a preprocessed light spot image;

step five, calculating the laser spot center position of the preprocessed spot image;

sixthly, adjusting the rotation angle of an optical element in the astigmatism compensation device, changing the size and the direction of astigmatism generated by the astigmatism compensation device, enabling the astigmatism generated by the astigmatism compensation device to be equal to the astigmatism of the original laser processing system in size and opposite in direction, and performing reverse compensation on the astigmatism of the whole laser processing system;

and seventhly, storing the pixel gray values of the spot images of the laser spot center position in the horizontal direction and the vertical direction, then performing Gaussian curve fitting, calculating the variance of Gaussian fitting curves in the horizontal direction and the vertical direction, and obtaining the spot radius sizes of the spot images in the horizontal direction and the vertical direction according to the calculated variance.

And step eight, observing the ovality of the final light spot in the defocused state through a beam quality analyzer to adjust the astigmatism compensation device, wherein when the light spot in the defocused state is a circular light spot to the maximum extent, the rotating angle of the corresponding astigmatism compensation device is the required angle, and the compensation amount of the astigmatism compensation device is the astigmatism compensation value at the moment.

Preferably, the astigmatism compensation device is made of flat glass.

Preferably, the astigmatism compensation device is made of flat glass.

Preferably, the third step is to build a light path system, then collect the spot image of the laser beam along the optical axis direction by using a camera,

preferably, the third step further comprises acquiring a background noise image by a camera.

The invention provides a better homogenization method for the remote light spots of the semiconductor laser, which avoids the problems that the whole mechanism is more complicated, the manufacturing cost of the product is relatively reduced, and the volume can be relatively smaller by adopting the method, thereby achieving better use effect.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.