CN113219805A - Linear regulation and control method and device for planar multi-beam laser and storage medium - Google Patents
Linear regulation and control method and device for planar multi-beam laser and storage medium Download PDFInfo
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Abstract
The invention discloses a linear regulation and control method of planar multi-beam laser, which comprises the following steps: analyzing to obtain laser beam information according to a preset multi-beam target field; obtaining a beam splitting hologram according to the laser beam information; performing complex light field superposition processing on the beam splitting hologram to obtain a multi-beam phase hologram; loading the multi-beam phase hologram to a spatial light modulator for verification to obtain energy distribution; and linearly adjusting the multi-beam phase hologram according to the energy distribution to update the multi-beam phase hologram. The invention also discloses a linear regulation and control device of the planar multi-beam laser and a computer readable storage medium. According to the invention, through linearly correcting the hologram, the linear regulation and control efficiency is improved, so that the linear regulation and control can be accurately realized, the whole output energy of the laser beam is effectively utilized, and the laser processing efficiency is improved.
Description
Technical Field
The invention relates to the technical field of laser application, in particular to a linear regulation and control method, linear regulation and control equipment and a storage medium of planar multi-beam laser.
Background
The ultrafast laser has unique ultrashort pulse width, ultrahigh repetition frequency and ultrastrong characteristics, can be focused to an ultrafine space region, has extremely high peak power and extremely short laser pulse, and cannot influence surrounding materials in the related space range in the processing process, so that the hyperfine processing is realized, and the ultrafast laser is widely applied to biomedicine, material processing, spectroscopy, imaging, science, research and the like.
With the development of research and the advancement of technology, the demand for parallel operation and multitasking is increasing. The spatial light modulator is adopted, and a multi-beam mode is generated by loading the beam splitting hologram in real time, so that not only can parallel processing be realized, but also the light field distribution can be dynamically adjusted according to actual requirements. However, the beam splitting hologram is calculated by GL, GS, GSW, MRAF algorithms and the like, wherein the GL algorithm realizes the design of the beam splitting hologram based on the beam deflection principle, does not need iteration, can correct energy in real time, and has very poor uniformity; the GS algorithm adopts a phase iteration algorithm, establishes a mapping relation with a target field, has relatively higher uniformity than the GL algorithm, but cannot meet industrial requirements and cannot linearly correct energy; the GSW algorithm is an improved GS algorithm, improves the uniformity, but cannot solve the linear energy correction function; the MRAF algorithm is also an improved GS algorithm, has high uniformity, but introduces noise, resulting in reduced light energy utilization.
Therefore, the GSW algorithm is adopted at present, in order to solve the energy correction function, a camera feedback algorithm is introduced by some scientific research units to correct energy, that is, the energy and the position information of all laser beams are received by the CCD, and whether the energy and the position information of each laser beam are matched with the corresponding preset energy and position information of the laser beam is judged in real time to correct. Although the algorithm can finally reach the preset calibration condition, when the algorithm is not matched, the whole hologram needs to be recalculated and corrected each time, the obtained hologram generates new energy inconsistency, namely, the energy cannot be linearly corrected in real time, so that the final correction calculation amount is huge, and the whole system is relatively complex.
Disclosure of Invention
The invention mainly aims to provide a linear regulation and control method, equipment and a storage medium of planar multi-beam laser, and aims to solve the technical problems of linearly correcting a hologram and improving the linear regulation and control efficiency of the hologram.
In order to achieve the above object, the present invention provides a linear control method for planar multi-beam laser, including the following steps:
analyzing to obtain laser beam information according to a preset multi-beam target field;
obtaining a beam splitting hologram according to the laser beam information;
performing complex light field superposition processing on the beam splitting hologram to obtain a multi-beam phase hologram;
loading the multi-beam phase hologram to a spatial light modulator for verification to obtain energy distribution;
and linearly adjusting the multi-beam phase hologram according to the energy distribution to update the multi-beam phase hologram.
Optionally, the analyzing the laser beam information according to a preset multi-beam target field includes:
analyzing a preset multi-beam target field to obtain the total number of laser beams and position information corresponding to each beam, wherein the position information is PkAnd (x, y), wherein k is 1 … M, M is the total number of laser beams, and x and y are coordinate information of the light spots respectively.
Optionally, the obtaining a beam splitting hologram according to the laser beam information includes:
obtaining a light field diagram of each light beam according to the laser beam information;
judging whether each light field image is matched with the phase image in the phase image set;
if so, acquiring a corresponding phase diagram;
if not, converting the position information in the light field image into light beam image information, and performing GS iterative algorithm processing on the light beam image information to obtain a phase image;
and combining the corresponding phase pattern and the obtained phase pattern to form a beam splitting hologram.
Optionally, the converting the position information in the light field map into light beam image information, and performing GS iterative algorithm processing on the light beam image information to obtain a phase map includes:
position information P in the light field diagramk(x, y) into beam image information Ak0,k＝1…M；
Establishing an input light field A0And an initial phase, wherein the input light field A0Image information calculated for the incident beam of the light field pattern, the initial phase being the beam image information Ak0Obtained by Fourier transform;
will input the light field A0Combined with the initial phase to complex amplitude
And Fourier transform is carried out, and a phase diagram is obtained through cyclic iteration.
Optionally, the light field to be input A0Combined with the initial phase to complex amplitude
And performing Fourier transform, and performing loop iteration to obtain a phase diagram, wherein the phase diagram comprises the following steps:
will input the light field A0Combined with the initial phase to complex amplitude
For complex amplitude
Performing a positive Fourier transform to the frequency domain
And extracting frequency domain phase information
The light beam is imaged to form information Ak0Replacing the amplitude factor A in the frequency domainklAnd calculating to obtain frequency domain
To the frequency domain
Performing inverse Fourier transform to obtain light field distribution in spatial domain
And extracting spatial domain phase information
Spatial domain phase information
As
Input light field A0As AklCombined into a new spatial light field
And performing positive Fourier transform to obtain a phase diagram by cyclic iteration, wherein l is the iteration number.
Optionally, after the obtaining the phase map, the linear regulation method further includes:
and storing the obtained phase diagram into the phase diagram set for matching next time.
Optionally, the performing complex optical field superposition processing on the beam splitting hologram to obtain a multi-beam phase hologram includes:
and performing complex amplitude summation calculation on the beam splitting hologram, introducing an energy correction coefficient into each complex amplitude to perform energy correction, and obtaining a complex amplitude summation term, wherein the specific calculation formula is as follows:
wherein the beam splitting hologram is
Energy correction factor ak, k 1 … M, a before calibrationkThe default value is 1;
extracting phase information from the obtained complex amplitude summation item to obtain a multi-beam phase hologram, wherein a specific calculation formula is as follows:
optionally, the linearly adjusting the multi-beam phase hologram according to the energy distribution to update the multi-beam phase hologram includes:
and when the energy distribution is not uniform, linearly modifying the energy correction coefficient according to the position of the multi-beam phase hologram so as to perform complex light field superposition processing and verification on the beam splitting hologram again to obtain the optimal multi-beam phase hologram with uniform energy distribution.
In addition, to achieve the above object, the present invention also provides a linear regulating apparatus of a planar multi-beam laser, including: the linear regulation program is stored on the memory and can run on the processor, and when being executed by the processor, the linear regulation program realizes the steps of the linear regulation method of the planar multi-beam laser.
Further, to achieve the above object, the present invention provides a computer-readable storage medium having stored thereon a linear regulating program, which when executed by a processor, implements the steps of the linear regulating method of planar multi-beam laser light as described in any one of the above.
The method comprises the steps of firstly analyzing according to a preset multi-beam target field to obtain laser beam information, then obtaining a beam splitting hologram according to the laser beam information, carrying out complex light field superposition processing on the beam splitting hologram to obtain a multi-beam phase hologram, loading the multi-beam phase hologram to a spatial light modulator for verification to obtain energy distribution, and finally carrying out linear adjustment on the multi-beam phase hologram according to the energy distribution to update the multi-beam phase hologram, so that the hologram with the optimal effect of uniform energy distribution is obtained. Through the linear correction hologram, the linear regulation and control efficiency is improved, so that the linear regulation and control can be accurately realized, the whole output energy of the laser beam is effectively utilized, and the laser processing efficiency is improved.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an operating environment of a linear control device for planar multi-beam laser according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of an embodiment of a linear control method for planar multi-beam laser according to the present invention;
fig. 3 is a schematic diagram of a detailed flow of step S30 in fig. 2.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an operating environment of a linear control device for planar multi-beam laser according to an embodiment of the present invention.
As shown in fig. 1, the linear regulating apparatus of planar multi-beam laser may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display (Display), an input unit such as a Keyboard (Keyboard), and the network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the hardware configuration of the linear regulating device for planar multi-beam laser shown in fig. 1 does not constitute a limitation of the linear regulating device, and may include more or less components than those shown, or combine some components, or arrange different components.
As shown in fig. 1, a memory 1005, which is a kind of computer-readable storage medium, may include therein an operating system, a network communication module, a user interface module, and a computer program. Among other things, the operating system is a program that manages and controls the linear regulatory devices and software resources, supporting the operation of the linear regulatory program as well as other software and/or programs.
In the hardware structure of the linear control device for planar multi-beam laser shown in fig. 1, the network interface 1004 is mainly used for accessing a network; the user interface 1003 is mainly used for detecting a confirmation instruction, an editing instruction, and the like. And the processor 1001 may be configured to call the linear regulator stored in the memory 1005 and perform the following operations:
analyzing to obtain laser beam information according to a preset multi-beam target field;
obtaining a beam splitting hologram according to the laser beam information;
performing complex light field superposition processing on the beam splitting hologram to obtain a multi-beam phase hologram;
loading the multi-beam phase hologram to a spatial light modulator for verification to obtain energy distribution;
and linearly adjusting the multi-beam phase hologram according to the energy distribution to update the multi-beam phase hologram.
Further, the linear regulatory device calls the linear regulatory program stored in the memory 1005 through the processor 1001 to perform the following operations:
analyzing a preset multi-beam target field to obtain the total number of laser beams and position information corresponding to each beam, wherein the position information is PkAnd (x, y), wherein k is 1 … M, M is the total number of laser beams, and x and y are coordinate information of the light spots respectively.
Further, the linear regulatory device calls the linear regulatory program stored in the memory 1005 through the processor 1001 to perform the following operations:
obtaining a light field diagram of each light beam according to the laser beam information;
judging whether each light field image is matched with the phase image in the phase image set;
if so, acquiring a corresponding phase diagram;
if not, converting the position information in the light field image into light beam image information, and performing GS iterative algorithm processing on the light beam image information to obtain a phase image;
and combining the corresponding phase pattern and the obtained phase pattern to form a beam splitting hologram.
Further, the linear regulatory device calls the linear regulatory program stored in the memory 1005 through the processor 1001 to perform the following operations:
position information P in the light field diagramk(x, y) into beam image information Ak0，k＝1…M；
Establishing an input light field A0And an initial phase, wherein the input light field A0Calculated image for incident beam of the light field mapInformation, the initial phase being the beam image information Ak0Obtained by Fourier transform;
will input the light field A0Combined with the initial phase to complex amplitude
And Fourier transform is carried out, and a phase diagram is obtained through cyclic iteration.
Further, the linear regulatory device calls the linear regulatory program stored in the memory 1005 through the processor 1001 to perform the following operations:
combining the input light field A0 and the initial phase into a complex amplitude
For complex amplitude
Performing a positive Fourier transform to the frequency domain
And extracting frequency domain phase information
The light beam is imaged to form information Ak0Replacing the amplitude factor A in the frequency domainklAnd calculating to obtain frequency domain
To the frequency domain
Performing inverse Fourier transform to obtain light field distribution in spatial domain
And extracting spatial domain phase information
Spatial domain phase information
As
Input light field A0As AklCombined into a new spatial light field
And performing positive Fourier transform to obtain a phase diagram by cyclic iteration, wherein l is the iteration number.
Further, the linear regulatory device calls the linear regulatory program stored in the memory 1005 through the processor 1001 to perform the following operations:
and storing the obtained phase diagram into the phase diagram set for matching next time.
Further, the linear regulatory device calls the linear regulatory program stored in the memory 1005 through the processor 1001 to perform the following operations:
and performing complex amplitude summation calculation on the beam splitting hologram, introducing an energy correction coefficient into each complex amplitude to perform energy correction, and obtaining a complex amplitude summation term, wherein the specific calculation formula is as follows:
wherein the beam splitting hologram is
Energy correction factor ak, k 1 … M, a before calibrationkThe default value is 1;
extracting phase information from the obtained complex amplitude summation item to obtain a multi-beam phase hologram, wherein a specific calculation formula is as follows:
further, the linear regulatory device calls the linear regulatory program stored in the memory 1005 through the processor 1001 to perform the following operations:
and when the energy distribution is not uniform, linearly modifying the energy correction coefficient according to the position of the multi-beam phase hologram so as to perform complex light field superposition processing and verification on the beam splitting hologram again to obtain the optimal multi-beam phase hologram with uniform energy distribution.
Based on the hardware structure of the linear regulation and control equipment for the planar multi-beam laser, various embodiments of the linear regulation and control method for the planar multi-beam laser in the operation state of the linear regulation and control equipment are provided.
Referring to fig. 2, fig. 2 is a schematic flow chart of an embodiment of the linear regulating method of the planar multi-beam laser according to the present invention.
In this embodiment, the linear control method for planar multi-beam laser includes the following steps:
step S10, analyzing to obtain laser beam information according to a preset multi-beam target field;
in the present embodiment, a multi-beam target field, which is a target laser emission field including a plurality of laser beams, is first preset, and may be set according to actual circumstances, such as setting 2 × 2 beam splitting, 3 × 5 beam splitting, and the like. And obtaining laser beam information through analysis.
Specifically, step S10 includes: analyzing a preset multi-beam target field to obtain the total number of laser beams and position information corresponding to each beam, wherein the position information is PkAnd (x, y), wherein k is 1 … M, M is the total number of laser beams, and x and y are coordinate information of the light spots respectively. And obtaining a light field graph corresponding to each light beam according to the position information. How many laser beams and how many sub-light field patterns are preset.
Step S20, obtaining a beam splitting hologram according to the laser beam information;
step S30, carrying out complex light field superposition processing on the split beam hologram to obtain a multi-beam phase hologram;
in this embodiment, a set of a series of single beams in a target scene is obtained according to laser beam information, that is, a beam splitting hologram is a set of phase patterns of each beam in a multi-beam target field. Then, a complex light field superposition principle is followed, that is, complex light field superposition processing is performed on the beam splitting hologram, so that a multi-beam phase hologram is obtained. For example, 2 × 2 beam splitting is taken as an example, four output light field patterns are obtained through analysis, corresponding four holograms (beam splitting holograms) are obtained through the GS algorithm, and then a hologram (multi-beam phase hologram) is obtained through superposition of complex light fields.
Step S40, loading the multi-beam phase hologram to a spatial light modulator for verification to obtain energy distribution;
in this embodiment, the spatial light modulator is under active control, and it can modulate a parameter of the light field through liquid crystal molecules, for example, modulate the amplitude of the light field, modulate the phase through the refractive index, modulate the polarization state through the rotation of the polarization plane, or implement the conversion of incoherent-coherent light, so as to write a certain information into the light wave, thereby achieving the purpose of light wave modulation. The multi-beam phase hologram is loaded to the spatial light modulator for verification, namely, the multi-beam phase hologram is loaded to an actual light path, and the energy distribution condition of the multi-beam phase hologram can be checked. If the energy distribution is uniform, the color of the hologram is uniform, and if the energy distribution is non-uniform, the color of the hologram is not uniform.
In step S50, the multi-beam phase hologram is linearly adjusted according to the energy distribution to update the multi-beam phase hologram.
In this embodiment, the multi-beam phase hologram is linearly adjusted according to the energy distribution, and if the energy distribution is uniform, the laser beam is directly output according to the multi-beam phase hologram, and if the energy distribution is non-uniform, the laser beam is linearly adjusted until the energy distribution is uniform. Through the linear correction hologram, the linear regulation and control efficiency is improved, so that the linear regulation and control can be accurately realized, the whole output energy of the laser beam is effectively utilized, and the laser processing efficiency is improved.
Based on the foregoing embodiments, in this embodiment, in the foregoing step S20, obtaining a beam splitting hologram according to laser beam information includes:
step S21, obtaining a light field map of each light beam according to the laser beam information;
in this embodiment, the laser beam information includes the total number of laser beams and position information corresponding to each beam. Position information is PkAnd (x, y), wherein k is 1 … M, M is the total number of laser beams, and x and y are coordinate information of the light spots respectively. And obtaining a light field graph corresponding to each light beam according to the position information. How many laser beams and how many sub-light field patterns are preset.
Step S22, judging whether each light field pattern matches with the phase pattern in the phase pattern set;
step S23, if matching, acquiring a corresponding phase diagram;
step S24, if not matched, converting the position information in the light field image into light beam image information, and carrying out GS iterative algorithm processing on the light beam image information to obtain a phase image;
further, step S24 includes:
step S241, position information P in the light field mapk(x, y) into beam image information Ak0，k＝1…M；
Step S242, establishing an input light field A0And an initial phase, wherein the input light field A0Image information calculated for the incident beam of the light field pattern, the initial phase being the beam image information Ak0Obtained by Fourier transform;
step S243, inputting the light field A0Combined with the initial phase to complex amplitude
And Fourier transform is carried out, and a phase diagram is obtained through cyclic iteration.
Further, step S243 includes:
1. will input the light field A0Combined with the initial phase to complex amplitude
2. For complex amplitude
Performing a positive Fourier transform to the frequency domain
And extracting frequency domain phase information
3. The light beam is imaged to form information Ak0Replacing the amplitude factor A in the frequency domainklAnd calculating to obtain frequency domain
4. To the frequency domain
Performing inverse Fourier transform to obtain light field distribution in spatial domain
And extracting spatial domain phase information
5. Spatial domain phase information
As
Input light field A0As AklCombined into a new spatial light field
And performing positive Fourier transform to obtain a phase diagram by cyclic iteration, wherein l is the iteration number.
In this embodiment, the light field pattern is compared with the phase patterns in the phase pattern sets in the database to determine whether the light field pattern is matched with the phase patterns in the phase pattern sets in the database, and if the light field pattern is matched with the phase patterns in the phase pattern sets, the phase pattern sets are directly searched for corresponding phase patterns. If not, the corresponding phase diagram is obtained through the GS iterative algorithm, and the phase diagram can be stored in the phase diagram set for matching next time, so that the phase diagram does not need to be calculated again next time, and the phase diagram can be directly matched and searched in the phase diagram set, thereby saving the operation and improving the processing efficiency.
And step S25, combining the corresponding phase diagram and the obtained phase diagram into a beam splitting hologram.
In this embodiment, the beam splitting hologram is a set of phase patterns corresponding to the target field splitting
The phase diagram corresponding to the laser beams can be obtained by presetting the number of the beams in the multi-beam target field, and the phase diagram is the beam splitting hologram. It should be noted that, for example, a preset multi-beam target field is 3 × 4 split, 12 optical field maps are obtained by analysis, 12 corresponding phase maps are obtained by matching or GS iterative algorithm, the 12 phase maps constitute a split beam hologram, and then a hologram (multi-beam phase hologram) is obtained by superimposing complex optical fields on the split beam hologram.
Referring to fig. 3, fig. 3 is a schematic view of a detailed flow of the step S30 in fig. 2.
Based on the foregoing embodiment, in this embodiment, the step S30 of performing complex optical field superposition processing on the split hologram to obtain the multi-beam phase hologram includes:
step S31, performing complex amplitude summation calculation on the beam splitting hologram, and introducing an energy correction coefficient to each complex amplitude to perform energy correction to obtain a complex amplitude summation term, wherein the specific calculation formula is as follows:
wherein the beam splitting hologram is
Energy correction factor akK is 1 … M, and ak is 1 by default before calibration;
step S32, extracting phase information from the obtained complex amplitude summation term to obtain a multi-beam phase hologram, where the specific calculation formula is:
in this embodiment, a beam splitting hologram is to be obtained by following the principle of superposition of complex optical fields
Performing complex amplitude summation calculation, introducing an energy correction coefficient to the complex amplitude of each beam splitting hologram, and setting a default value to be 1 before calibration; and finally, extracting phase information from the obtained complex amplitude summation item to obtain a multi-beam phase hologram.
Further, based on the above-described embodiment, in another embodiment, when the energy distribution is not uniform, the energy correction coefficient is linearly modified according to the position of the multi-beam phase hologram, so as to perform the complex optical field superposition processing and verification on the multi-beam hologram again, and obtain the optimal multi-beam phase hologram with uniform energy distribution.
In this embodiment, the obtained multi-beam phase hologram is loaded to an actual optical path for verification, if the energy distribution is not uniform, the energy correction factor of the corresponding light spot is directly modified, that is, the energy correction coefficient is modified, then the complex amplitude summation is performed again for verification, and so on, so as to obtain the optimal multi-beam phase hologram. The energy correction coefficient is linearly modified, so that the hologram is linearly corrected, the linear regulation and control efficiency is improved, accurate regulation and control can be realized, the whole output energy of the laser beam is effectively utilized, and the laser processing efficiency is improved.
Furthermore, the present invention provides a computer-readable storage medium having a linear regulating program stored thereon, the linear regulating program being executed by a processor to perform the steps of:
analyzing to obtain laser beam information according to a preset multi-beam target field;
obtaining a beam splitting hologram according to the laser beam information;
performing complex light field superposition processing on the beam splitting hologram to obtain a multi-beam phase hologram;
loading the multi-beam phase hologram to a spatial light modulator for verification to obtain energy distribution;
and linearly adjusting the multi-beam phase hologram according to the energy distribution to update the multi-beam phase hologram.
Further, the linear regulator is further configured to be executed by the processor to:
analyzing a preset multi-beam target field to obtain the total number of laser beams and position information corresponding to each beam, wherein the position information is PkAnd (x, y), wherein k is 1 … M, M is the total number of laser beams, and x and y are coordinate information of the light spots respectively.
Further, the linear regulator is further configured to be executed by the processor to:
obtaining a light field diagram of each light beam according to the laser beam information;
judging whether each light field image is matched with the phase image in the phase image set;
if so, acquiring a corresponding phase diagram;
if not, converting the position information in the light field image into light beam image information, and performing GS iterative algorithm processing on the light beam image information to obtain a phase image;
and combining the corresponding phase pattern and the obtained phase pattern to form a beam splitting hologram.
Further, the linear regulator is further configured to be executed by the processor to:
position information P in the light field diagramk(x, y) into beam image information Ak0，k＝1…M；
Establishing an input light field A0And an initial phase, wherein the input light field A0Image information calculated for the incident beam of the light field pattern, the initial phase being the beam image information Ak0Obtained by Fourier transform;
will input the light field A0Combined with the initial phase to complex amplitude
And Fourier transform is carried out, and a phase diagram is obtained through cyclic iteration.
Further, the linear regulator is further configured to be executed by the processor to:
will input the light field A0Combined with the initial phase to complex amplitude
For complex amplitude
Performing a positive Fourier transform to the frequency domain
And extracting frequency domain phase information
The light beam is imaged to form information Ak0Replacing the amplitude factor A in the frequency domainklAnd calculating to obtain frequency domain
To the frequency domain
Performing inverse Fourier transform to obtain light field distribution in spatial domain
And extracting spatial domain phase information
Spatial domain phase information
As
Input light field A0As AklCombined into a new spatial light field
And performing positive Fourier transform to obtain a phase diagram by cyclic iteration, wherein l is the iteration number.
Further, the linear regulator is further configured to be executed by the processor to:
and storing the obtained phase diagram into the phase diagram set for matching next time.
Further, the linear regulator is further configured to be executed by the processor to:
and performing complex amplitude summation calculation on the beam splitting hologram, introducing an energy correction coefficient into each complex amplitude to perform energy correction, and obtaining a complex amplitude summation term, wherein the specific calculation formula is as follows:
wherein the beam splitting hologram is
Energy correction factor akK 1 … M, before calibration, akThe default value is 1;
extracting phase information from the obtained complex amplitude summation item to obtain a multi-beam phase hologram, wherein a specific calculation formula is as follows:
further, the linear regulator is further configured to be executed by the processor to:
and when the energy distribution is not uniform, linearly modifying the energy correction coefficient according to the position of the multi-beam phase hologram so as to perform complex light field superposition processing and verification on the beam splitting hologram again to obtain the optimal multi-beam phase hologram with uniform energy distribution.
In this embodiment, first, laser beam information is obtained through analysis according to a preset multi-beam target field, then, a beam splitting hologram is obtained according to the laser beam information, so that complex light field superposition processing is performed on the beam splitting hologram to obtain a multi-beam phase hologram, the multi-beam phase hologram is loaded to a spatial light modulator for verification to obtain energy distribution, and finally, linear adjustment is performed on the multi-beam phase hologram according to the energy distribution to update the multi-beam phase hologram, so that a hologram with the best effect of uniform energy distribution is obtained. Through the linear correction hologram, the linear regulation and control efficiency is improved, so that the linear regulation and control can be accurately realized, the whole output energy of the laser beam is effectively utilized, and the laser processing efficiency is improved.
The specific embodiment of the computer-readable storage medium of the present invention is substantially the same as the embodiments of the linear control method for planar multi-beam laser, and will not be described herein again in detail.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. With this understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a readable storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes several instructions for enabling a terminal (which may be a computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
The present invention is described in connection with the accompanying drawings, but the present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and those skilled in the art can make various changes without departing from the spirit and scope of the invention as defined by the appended claims, and all changes that come within the meaning and range of equivalency of the specification and drawings that are obvious from the description and the attached claims are intended to be embraced therein.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A linear regulation and control method of planar multi-beam laser is characterized by comprising the following steps:
analyzing to obtain laser beam information according to a preset multi-beam target field;
obtaining a beam splitting hologram according to the laser beam information;
performing complex light field superposition processing on the beam splitting hologram to obtain a multi-beam phase hologram;
loading the multi-beam phase hologram to a spatial light modulator for verification to obtain energy distribution;
and linearly adjusting the multi-beam phase hologram according to the energy distribution to update the multi-beam phase hologram.
2. The linear regulating method as claimed in claim 1, wherein the analyzing the laser beam information according to the predetermined multi-beam target field comprises:
analyzing a preset multi-beam target field to obtain the total number of laser beams and position information corresponding to each beam, wherein the position information is PkAnd (x, y), wherein k is 1 … M, M is the total number of laser beams, and x and y are coordinate information of the light spots respectively.
3. The linear control method according to claim 1 or 2, wherein the obtaining a beam splitting hologram according to the laser beam information comprises:
obtaining a light field diagram of each light beam according to the laser beam information;
judging whether each light field image is matched with the phase image in the phase image set;
if so, acquiring a corresponding phase diagram;
if not, converting the position information in the light field image into light beam image information, and performing GS iterative algorithm processing on the light beam image information to obtain a phase image;
and combining the corresponding phase pattern and the obtained phase pattern to form a beam splitting hologram.
4. The linear control method according to claim 3, wherein the converting the position information in the light field map into the beam image information and performing GS iterative algorithm processing on the beam image information to obtain the phase map comprises:
position information P in the light field diagramk(x, y) into beam image information Ak0,k＝1…M；
Establishing an input light field A0And an initial phase, wherein the input light field A0Calculated for the incident beam of the light field mapThe initial phase is the beam image information Ak0Obtained by Fourier transform;
will input the light field A0Combined with the initial phase to complex amplitude
And Fourier transform is carried out, and a phase diagram is obtained through cyclic iteration.
5. The linear modulation method according to claim 4, wherein the light field A to be input is input0Combined with the initial phase to complex amplitude
And performing Fourier transform, and performing loop iteration to obtain a phase diagram, wherein the phase diagram comprises the following steps:
will input the light field A0Combined with the initial phase to complex amplitude
For complex amplitude
Performing a positive Fourier transform to the frequency domain
And extracting frequency domain phase information
The light beam is imaged to form information Ak0Replacing the amplitude factor A in the frequency domainklAnd calculating to obtain frequency domain
To the frequency domain
Performing inverse Fourier transform to obtain light field distribution in spatial domain
And extracting spatial domain phase information
Spatial domain phase information
As
Input light field A0As AklCombined into a new spatial light field
And performing positive Fourier transform to obtain a phase diagram by cyclic iteration, wherein l is the iteration number.
6. The linear modulation method according to claim 4 or 5, wherein after the obtaining the phase map, the linear modulation method further comprises:
and storing the obtained phase diagram into the phase diagram set for matching next time.
7. The linear control method according to claim 1, wherein the performing the complex optical field superposition processing on the beam splitting hologram to obtain the multi-beam phase hologram comprises:
and performing complex amplitude summation calculation on the beam splitting hologram, introducing an energy correction coefficient into each complex amplitude to perform energy correction, and obtaining a complex amplitude summation term, wherein the specific calculation formula is as follows:
wherein the beam splitting hologram is
Energy correction factor akK 1 … M, before calibration, akThe default value is 1;
extracting phase information from the obtained complex amplitude summation item to obtain a multi-beam phase hologram, wherein a specific calculation formula is as follows:
8. the linear adjustment and control method of claim 7, wherein the linearly adjusting the multi-beam phase hologram according to the energy distribution to update the multi-beam phase hologram comprises:
and when the energy distribution is not uniform, linearly modifying the energy correction coefficient according to the position of the multi-beam phase hologram so as to perform complex light field superposition processing and verification on the beam splitting hologram again to obtain the optimal multi-beam phase hologram with uniform energy distribution.
9. A linear regulating apparatus of planar multi-beam laser, characterized by comprising: a memory, a processor, and a linear regulating program stored on the memory and executable on the processor, the linear regulating program when executed by the processor implementing the steps of the linear regulating method of planar multibeam laser according to any one of claims 1 to 8.
10. A computer-readable storage medium, characterized in that a linear regulation program is stored thereon, which when executed by a processor, implements the steps of the linear regulation method of planar multibeam laser according to any one of claims 1 to 8.
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