Control method, device and equipment of fiber laser and storage medium

Abstract

The invention provides a control method, device and equipment of an optical fiber laser and a storage medium, and the method comprises the steps: carrying out the high-sensitivity monitoring processing of a light beam transmission path of a fusion welding point region in the optical fiber laser, and obtaining micro-reflection data; performing multi-angle analysis processing on the characteristic waveform and the mode coupling signal in the micro-reflection data according to pre-stored optical reference information to obtain corresponding welding point abnormal distribution information; according to the abnormal distribution information, performing directional adjustment processing on local pumping energy and a thermal management mode of the fusion welding point area to obtain local control parameters; and performing cooperative calibration processing on the overall output power of the fiber laser according to the local control parameters to obtain target light beam output. Through the cooperation of monitoring analysis and directional adjustment, the micro reflection of the fusion welding point can be more accurately detected and inhibited, and the method has a remarkable effect on the stable output of light beams of a high-power fiber laser.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment control, and in particular to a control method, device, equipment and storage medium for a fiber laser. Background Art

[0002] In the field of research, development and application of fiber lasers, as the laser output power continues to rise, the energy density and heat load inside the fiber also increase, which puts higher requirements on the structural design, coupling efficiency and beam quality of the fiber itself. Traditional fiber lasers usually use simple output power feedback and overall thermal management methods in the lower power range, and only adjust the macro power stability and thermal stability. However, when the laser enters the high-power output stage, the fusion point area of ​​the optical fiber often causes weak but potentially dangerous reflections due to uneven refractive index transition or stress concentration. This micro-reflection is usually masked by background light, thermal noise or slight scattering signals of the optical fiber in conventional detection, and it is difficult to accurately identify through simple overall power monitoring.

[0003] In the prior art, power redundancy or uniform power reduction is often used to avoid abnormal instability in response to reflection and mode coupling problems that may occur at the fiber fusion point, but this can easily lead to waste of resources or a decrease in overall efficiency under high-power applications. In addition, common optical monitoring methods are mostly based on large-aperture sensors or detection of overall beam quality, and lack sensitivity and resolution for micro-reflection signals at local fusion points. Once a tiny local problem occurs in the fusion point area, it is very likely to cause a series of chain problems such as laser beam mode degradation or uneven heat dissipation. In order to more effectively detect and suppress micro-reflections in the fusion point area, and maintain beam quality while maintaining high power output, it is necessary to monitor and analyze the micro-reflection data and mode coupling signals in a targeted manner, and to fine-tune them in combination with local pump energy and thermal management methods.

[0004] However, in high-power laser applications, there are a large number of gain sections, coupling devices, and fusion points in the optical fiber, and each module will experience different degrees of thermal stress and optical stress during operation. How to accurately monitor and control the local reflection risk caused by specific fusion points without losing global output performance has become a key problem in the in-depth development of current fiber lasers. Summary of the invention

[0005] The main purpose of the present invention is to solve the technical problem that it is difficult for the existing fiber laser to timely detect and suppress the local reflection of the welding point under the high power output state, which makes the beam mode susceptible to interference and reduces the overall stability of the system; A first aspect of the present invention provides a control method for a fiber laser, the control method for a fiber laser comprising: Performing high-sensitivity monitoring processing on the beam transmission path of a preset area inside the fiber laser to obtain micro-reflection data, wherein the preset area is a welding point area; Performing multi-angle analysis and processing on the characteristic waveform and mode coupling signal in the micro-reflection data according to the pre-stored optical reference information to obtain corresponding abnormal distribution information of the welding point; According to the abnormal distribution information of the welding points, the local pump energy and thermal management method of the welding point area are directional adjusted to obtain local control parameters; According to the local control parameters, the overall output power of the fiber laser is collaboratively calibrated to obtain a target beam output.

[0006] Optionally, in a first implementation of the first aspect of the present invention, the step of performing high-sensitivity monitoring processing on a beam transmission path of a preset area inside the fiber laser to obtain micro-reflection data includes: A multi-channel detection end is configured for the preset area, and optical signals of different wavelengths and different polarization states are synchronously collected and processed by the multi-channel detection end to obtain multi-dimensional optical sampling information for characterizing local scattering changes; Performing segmented threshold filtering on the background optical noise of the multi-dimensional optical sampling information to obtain a preliminary reflection detection result, wherein the preliminary reflection detection result includes a candidate interval for indicating that a reflection pulse may exist and a corresponding time index; Performing time domain comparison processing on the pulse positions of each candidate interval according to the time index in the preliminary reflection detection result to obtain the intensity distribution of the reflection signal; According to the intensity distribution of the reflection signal, correlation matching processing is performed on the multi-dimensional optical sampling information, and corresponding effective reflection peak position and amplitude information are screened out from the multi-dimensional optical sampling information based on a matching index to obtain micro-reflection data.

[0007] Optionally, in a second implementation of the first aspect of the present invention, performing multi-angle analysis and processing on the characteristic waveform and the mode coupling signal in the micro-reflection data according to the pre-stored optical reference information to obtain the corresponding abnormal distribution information of the welding point includes: Performing waveform deconstruction processing on the characteristic waveform in the micro-reflection data to obtain continuous spectrum fragments and discrete energy peak information; According to the continuous spectrum fragments and the discrete energy peak information, a mode mapping process is performed on a reference database to obtain a suspected sub-mode coupling index; Performing joint comparison processing on the sub-mode coupling index and the mode coupling signal of the micro-reflection data to obtain a mode interference mark on the local time axis; The pre-stored optical reference information is subjected to difference analysis processing according to the pattern interference mark to obtain abnormal distribution information of the welding points.

[0008] Optionally, in a third implementation of the first aspect of the present invention, performing difference analysis processing on pre-stored optical reference information according to the pattern interference mark to obtain abnormal distribution information of welding points includes: Performing index reading processing on the temporal and spatial positions of the pattern interference marks to obtain an interference position set for indicating interference moments and interference section boundaries; Performing multi-dimensional comparison processing on pre-stored optical reference information according to the interference position set to obtain difference distribution data for representing the difference in interference intensity; Performing anomaly threshold screening processing on the difference distribution data to obtain potential anomalies; According to the potential abnormal items, the spatial coordinates of the welding points in the welding point area are subjected to association mapping processing to obtain abnormal distribution information of the welding points.

[0009] Optionally, in a fourth implementation of the first aspect of the present invention, the local pump energy and thermal management method of the welding point area are directional-adjusted according to the abnormal distribution information of the welding point, and the local control parameters obtained include: Positioning the welding point coordinates in the welding point area according to the abnormal distribution information of the welding points to obtain a target welding point set; Correcting the local pump energy of the pump source corresponding to the target welding point set to obtain a pump power allocation instruction; The pump power allocation instruction is coupled and adjusted with the thermal management method of the welding point area to obtain refined cooling and heat dissipation instructions; The pump power allocation instructions are recombined according to the refined cooling and heat dissipation instructions to obtain local control parameters.

[0010] Optionally, in a fifth implementation of the first aspect of the present invention, the correcting the local pump energy of the pump source corresponding to the target welding point set to obtain the pump power allocation instruction includes: Performing parameter reading processing on each pump source output associated with the target welding point set to obtain original pump power data; Performing difference calculation processing on the energy demand of the welding point section according to the original pump power data to obtain a power deviation value; Performing fitting processing on the power deviation value and the adjustable remaining pump energy of the pump source to obtain temporary power allocation data; A safety threshold verification process is performed on the temporary power allocation data to obtain a pump power allocation instruction.

[0011] Optionally, in a sixth implementation of the first aspect of the present invention, the collaborative calibration process is performed on the overall output power of the fiber laser according to the local control parameter to obtain the target beam output, comprising: The local control parameters are merged in sections to obtain power adjustment commands involving the multi-stage amplification units inside the fiber laser; According to the power adjustment command, matching and scheduling processing is performed on the gain fiber and the related coupler in the fiber laser to obtain multi-channel output power instructions; Comparing the multi-channel output power instructions with the real-time power readings output by the terminal monitoring module of the optical fiber laser to obtain power deviation information; The multi-path output power instructions are redistributed according to the power deviation information, and the target beam output of the optical fiber laser is performed based on the redistributed multi-path output power instructions.

[0012] A second aspect of the present invention provides a control device for a fiber laser, the control device for a fiber laser comprising: A high-sensitivity monitoring module is used to perform high-sensitivity monitoring processing on the light beam transmission path of a preset area inside the fiber laser to obtain micro-reflection data, wherein the preset area is a welding point area; A multi-angle analysis module, used to perform multi-angle analysis and processing on the characteristic waveform and mode coupling signal in the micro-reflection data according to pre-stored optical reference information, so as to obtain corresponding abnormal distribution information of welding points; A directional adjustment module, used to perform directional adjustment processing on the local pump energy and thermal management method of the welding point area according to the abnormal distribution information of the welding point, so as to obtain local control parameters; The collaborative calibration module is used to perform collaborative calibration processing on the overall output power of the fiber laser according to the local control parameters to obtain a target beam output.

[0013] A third aspect of the present invention provides a control device for a fiber laser, comprising: a memory and at least one processor, wherein instructions are stored in the memory, and the memory and the at least one processor are interconnected via a line; and the at least one processor calls the instructions in the memory so that the control device of the fiber laser executes the steps of the above-mentioned control method of the fiber laser.

[0014] A fourth aspect of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores instructions, which, when executed on a computer, enable the computer to execute the steps of the above-mentioned method for controlling a fiber laser.

[0015] The control method, device, equipment and storage medium of the above-mentioned fiber laser obtain micro-reflection data by performing high-sensitivity monitoring processing on the beam transmission path of the internal welding point area of ​​the fiber laser; performing multi-angle analysis processing on the characteristic waveform and mode coupling signal in the micro-reflection data according to the pre-stored optical reference information to obtain the corresponding abnormal distribution information of the welding point; performing directional adjustment processing on the local pump energy and thermal management method of the welding point area according to the abnormal distribution information to obtain local control parameters; and then performing collaborative calibration processing on the overall output power of the fiber laser according to the local control parameters to obtain the target beam output. The present invention can more accurately detect and suppress micro-reflection of the welding point through the coordinated cooperation of the above-mentioned monitoring analysis and directional adjustment, which has a significant effect on the stable output of the beam of the high-power fiber laser.

[0016] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a first embodiment of a method for controlling a fiber laser according to an embodiment of the present invention; Figure 2 A schematic diagram of an embodiment of a control device for a fiber laser in an embodiment of the present invention; Figure 3 FIG. 1 is a schematic diagram of an embodiment of a control device for a fiber laser in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0020] The terms "including" and "having" and any variations thereof mentioned in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device end including a series of steps or units is not limited to the listed steps or units, but may optionally include other steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or device ends.

[0021] To facilitate understanding of this embodiment, a control method for a fiber laser disclosed in an embodiment of the present invention is first described in detail. Figure 1 As shown, the method comprises the following steps: 101. Perform high-sensitivity monitoring processing on a beam transmission path of a preset area inside the fiber laser to obtain micro-reflection data, wherein the preset area is a welding point area; In one embodiment of the present invention, the high-sensitivity monitoring processing of the light beam transmission path of a preset area inside the fiber laser to obtain micro-reflection data includes: configuring a multi-channel detection end for the preset area, synchronously collecting and processing light signals of different wavelengths and different polarization states through the multi-channel detection end, and obtaining multi-dimensional optical sampling information for characterizing local scattering changes; performing segmented threshold filtering processing on the background optical noise of the multi-dimensional optical sampling information to obtain a preliminary reflection detection result, wherein the preliminary reflection detection result includes a candidate interval for indicating that a reflection pulse may exist and a corresponding time index; performing time domain comparison processing on the pulse position of each candidate interval according to the time index in the preliminary reflection detection result to obtain an intensity distribution of the reflection signal; performing correlation matching processing on the multi-dimensional optical sampling information according to the intensity distribution of the reflection signal, and screening out the corresponding effective reflection peak position and amplitude information from the multi-dimensional optical sampling information based on the matching index to obtain micro-reflection data.

[0022] Specifically, when configuring a multi-channel detection end for the preset area and synchronously collecting and processing optical signals of different wavelengths and different polarization states through the detection end, it is necessary to set up several splitters near the fusion point of the fiber laser to divide the main transmission beam into multiple branches according to a predetermined ratio, and ensure that each branch signal is transmitted independently in space. In order to obtain more stable multi-channel data, detectors with different response bandwidths can be connected in sequence at the rear end of the splitter so that each detector corresponds to an optical signal of a specific wavelength or polarization state. A high-speed analog-to-digital conversion module can be configured for the output end of each detector, and a unified sampling frequency can be set in the module to reduce the sampling delay difference between different channels at the hardware level. If the fiber laser works in pulse mode, it is necessary to enable the trigger logic in the analog-to-digital conversion module so that all channels start data reading at the same time under the same pulse trigger signal, and write the sampled data into the cache queue in time order so that the multi-channel signals are aligned on the time axis. In order to ensure that the capture of weak scattering is still maintained under high-power operation, an optical isolator or loss plate can be added to the front end of the detector to avoid strong light burning the detector or saturation. In addition, if there are signals with different polarization states, a polarization beam splitter needs to be added to the spectroscopic device to import the mutually perpendicular polarization components into their respective detection channels. The multi-channel detection end generates high-dimensional raw data during acquisition. The light intensity information of each channel is independent in terms of time, frequency, and polarization. These data together constitute multi-dimensional optical sampling information that can characterize local scattering changes.

[0023] Specifically, when the background optical noise of the multi-dimensional optical sampling information is subjected to segmented threshold filtering and a preliminary reflection detection result is obtained, it is necessary to first define several continuous segments on the sampling time axis or frequency axis to divide the overall signal into segments of a controllable range. The boundary of each segment can be set based on the existing noise distribution statistical data. The specific method is to perform offline calculations on the sampling results output by the high-power laser in a low-power or no-load state to determine the fluctuation range of the noise level in different segments. Subsequently, threshold parameters are set for each segment, including the average noise amplitude and several standard deviation multiples, to distinguish normal noise from suspicious reflections. In the actual filtering stage, the multi-dimensional optical sampling information in each segment is compared point by point. When a sampling point exceeds the threshold range of the segment in terms of light intensity or amplitude, it is determined that there is a suspected reflection pulse in the range of the point, and its time index is recorded in the detection result. If the threshold is exceeded at several adjacent sampling points, the time indexes of these sampling points can be merged into the same candidate interval to form a more complete suspected reflection segment information. This segmented threshold filtering breaks down the overall sampled data into multiple segments for processing, avoiding over- or under-screening under a single threshold, and also allows the filtering process to perform differentiated processing on the noise levels of different segments. Ultimately, a series of candidate interval start and end times and amplitude ranges can be generated in the preliminary reflection detection results, with time indexes corresponding to each interval to indicate more specific suspicious pulse locations.

[0024] Specifically, according to the time index in the preliminary reflection detection result, the pulse position of each candidate interval is subjected to time domain comparison processing. When the intensity distribution of the reflected signal is obtained, it is necessary to further extract the pulse envelope of the multi-channel sampling data in those candidate intervals and compare the rising edge, peak segment and falling edge of the pulse point by point. To achieve this process, the original sampling of each channel previously recorded can be retrieved in the data management module, and the specific start and end points of the corresponding interval can be found by matching the time index. When extracting the pulse amplitude, it is usually necessary to perform baseline correction on the pulse envelope in each channel, that is, to deduct the mean noise component from the original light intensity to avoid being pulled up or down by noise when the peak value is small. Then, a differential or convolution operation can be performed to determine the time length between the rising edge and the peak position of the pulse, and combined with the energy integral of the pulse peak and the overall area of ​​the falling edge, a higher resolution description of the pulse intensity is formed. If the fiber laser uses multi-wavelength pumping, the data of different wavelength channels need to be normalized and corrected so that the pulse intensity of each channel in the same candidate interval can be compared on a unified standard. Through this time domain comparison processing, the suspicious intervals obtained by preliminary detection can be refined to a more accurate pulse range, and then the amplitude distribution and waveform shape of the pulses in each interval can be output.

[0025] Specifically, according to the intensity distribution of the reflected signal, the multidimensional optical sampling information is subjected to correlation matching processing, and the corresponding effective reflection peak position and amplitude information are screened out from the multidimensional optical sampling information based on the matching index. When the micro-reflection data is obtained, it is necessary to combine the extracted time domain pulse envelope with the numerical correlation between the original multi-channel sampling to determine whether it is a real reflection peak. In the actual implementation process, the peak value of the pulse is often compared with the original data in three dimensions, including the time axis, wavelength axis and polarization axis. If a segment of sampling is basically consistent with the pulse morphology in these three dimensions, the segment is determined as an "effective reflection peak" and the specific time index and amplitude value of its peak value are recorded. If there is a large deviation in some dimensions, the segment of sampling is excluded to prevent the noise spike from being misjudged as a reflection peak. The correlation matching algorithm generally adopts a point-by-point accumulation method, that is, in the same time window, the reflection signal and the original sampling are numerically multiplied or the difference is accumulated, and compared with the preset matching threshold. Once the accumulation result exceeds the threshold, the effective reflection peak information is output. The peak position and amplitude information can be sorted according to the amplitude, and peaks with too low amplitude or too short duration can be marked as noise peaks, thereby retaining the most influential micro-reflection features under high power conditions in the final micro-reflection data.

[0026] 102. Perform multi-angle analysis and processing on characteristic waveforms and mode coupling signals in micro-reflection data according to pre-stored optical reference information to obtain corresponding abnormal distribution information of welding points; In one embodiment of the present invention, the multi-angle analysis and processing of the characteristic waveform and the mode coupling signal in the micro-reflection data according to the pre-stored optical reference information to obtain the corresponding abnormal distribution information of the welding point includes: performing waveform deconstruction processing on the characteristic waveform in the micro-reflection data to obtain continuous spectral fragments and discrete energy peak information; performing mode mapping processing on the reference database according to the continuous spectral fragments and discrete energy peak information to obtain a suspicious sub-mode coupling index; performing joint comparison processing on the sub-mode coupling index and the mode coupling signal of the micro-reflection data to obtain a mode interference mark on the local time axis; performing difference analysis processing on the pre-stored optical reference information according to the mode interference mark to obtain the abnormal distribution information of the welding point.

[0027] Specifically, when waveform deconstruction processing is performed on the characteristic waveform in the micro-reflection data to obtain continuous spectrum fragments and discrete energy peak information, it is necessary to first extract the time series and spectrum fragments related to the fiber fusion point from the micro-reflection data, and perform multi-level segmentation on the waveform in the deconstruction algorithm. In order to implement this process, an analysis method relying on short-time Fourier transform or wavelet transform can be set in the signal processing unit, and the reflection data is locally windowed on the time axis and frequency axis respectively to intercept the spectral components of each moment. Subsequently, smoothing and difference processing are performed on the intercepted waveform to distinguish the continuous bandwidth part from the pulse peak part, forming a preliminary division of continuous spectrum fragments and discrete energy peaks. The smoothed waveform is transferred to the threshold judgment module to identify the high amplitude area exceeding the background baseline in a specific frequency band, and the curve fitting is performed on the area to obtain the center position and corresponding energy of the peak. The output continuous spectrum fragment can be archived to a special data index to judge the degree of fiber mode change by comparing the bandwidth characteristics in the subsequent process; the discrete energy peak information can be written into a peak list, which contains the timestamp, amplitude and neighboring spectral range of the peak. Through this processing method, the characteristic waveform is finely decomposed into spectral segments for pattern analysis and energy peaks for amplitude analysis, achieving a multi-dimensional description of the local scattering of the welding point.

[0028] Furthermore, the difference analysis processing of the pre-stored optical reference information according to the pattern interference mark to obtain the abnormal distribution information of the welding point includes: index reading processing of the spatiotemporal position of the pattern interference mark to obtain an interference position set for indicating the interference moment and the boundary of the interference segment; multi-dimensional comparison processing of the pre-stored optical reference information according to the interference position set to obtain difference distribution data for representing the difference in interference intensity; abnormal threshold screening processing is performed on the difference distribution data to obtain potential abnormal items; and association mapping processing is performed on the welding point space coordinates of the welding point area according to the potential abnormal items to obtain the abnormal distribution information of the welding point.

[0029] Specifically, when the mode mapping process is performed on the reference database according to the continuous spectrum fragment and discrete energy peak information, and the suspicious sub-mode coupling index is obtained, each continuous spectrum fragment and discrete energy peak needs to be compared with the standard mode characteristics in the reference database in terms of wavelength, power distribution and coherence properties. The mode mapping process can pre-store the common fundamental mode and sub-mode distribution diagrams of different types of optical fibers in the database module, as well as characteristic parameters such as bandwidth expansion and peak drift that may occur under various typical coupling forms. During the calculation process, the algorithm will assign a matching weight to each control item based on the spectral similarity and peak statistical characteristics. When the matching weight of a certain fragment or peak in the key dimension exceeds the set threshold, a "suspicious sub-mode coupling" prompt is sent to the output end, and a corresponding sub-mode coupling index is generated as the target of subsequent processing. If the same spectrum fragment maintains a high similarity with a certain type of sub-mode coupling mode in the database in multiple features, a refined matching will be further performed to determine which mode coupling form this fragment is closest to. Discrete peak information will also participate in this comparison to check whether there are multiple reflection peaks corresponding to a single sub-mode mode. The final mapping process outputs an index list containing the spatiotemporal locations of suspected submode couplings and the matching scores.

[0030] Specifically, when the sub-mode coupling index and the mode coupling signal of the micro-reflection data are jointly compared and processed to obtain the mode interference mark on the local time axis, it is necessary to correspond the coupling type indicated in the sub-mode coupling index to the mode coupling signal recorded in the micro-reflection data one by one, and align the peak phase and amplitude changes of the two on the time axis. To complete this process, the specific coupling form and its occurrence interval in the sub-mode coupling index are first read in the mode analysis module, and then the coupling signal characteristics collected in the same time period or frequency band are retrieved in the micro-reflection data. If the two are consistent in characteristic amplitude and phase offset, and overlap or continuously distributed in the occurrence time, it is determined that significant mode interference occurs in the area, and the peak time of interference is determined by interpolation or curve fitting. After the interference mark is generated, the coupling type label and intensity level of the mode interference will be attached to intuitively reflect the degree of interference when recording. The interference mark also contains a label of the local time axis, which is used to indicate the time period or pulse index where the interference occurs, so as to distinguish whether the interference is periodic during multiple pulse repetitions. Through such joint comparison, a one-to-one mapping relationship is formed between the mode coupling index and the micro-reflection data, so that the interference mark can be focused on the most representative sub-mode coupling time zone.

[0031] Specifically, when the pre-stored optical reference information is subjected to difference analysis processing according to the mode interference mark, when the abnormal distribution information of the fusion point is obtained, it is necessary to compare the specific time and space position indicated by the interference mark with the normal mode distribution of the same section of the fusion point in the optical reference information. The difference analysis processing usually takes the nominal mode distribution map and historical data in the optical reference information as the comparison benchmark, and evaluates the severity and distribution range of the fusion point abnormality by calculating the degree of deviation of the current interference mark in the dimensions of spectral width, energy attenuation and polarization state distribution. If there is a significant inconsistency between the area covered by the interference mark and the normal transmission mode in the reference information, the algorithm will determine this place as the abnormal fusion point area, and add the coordinate location and interference intensity parameters of the abnormal area to the output record. In order to improve the accuracy of the abnormal distribution, the difference analysis processing will be extended to several sampling segments near the fusion point in the spatial dimension to exclude occasional errors generated only at a single point. The final generated abnormal distribution information of the fusion point will be output in the form of a list or a spectrum, and contains the coherence level of the mode interference, the optical loss index and the corresponding fusion point coordinate index.

[0032] 103. According to the abnormal distribution information of the welding points, the local pump energy and thermal management method of the welding point area are directional adjusted to obtain local control parameters; In one embodiment of the present invention, the local pump energy and thermal management method of the welding point area are directed adjusted according to the abnormal distribution information of the welding points to obtain local control parameters, including: positioning the welding point coordinates of the welding point area according to the abnormal distribution information of the welding points to obtain a target welding point set; correcting the local pump energy of the pump source corresponding to the target welding point set to obtain a pump power allocation instruction; coupling and adjusting the pump power allocation instruction with the thermal management method of the welding point area to obtain a refined cooling and heat dissipation instruction; recombining the pump power allocation instruction according to the refined cooling and heat dissipation instruction to obtain local control parameters.

[0033] Specifically, the fusion point coordinates of the fusion point area are positioned and processed according to the fusion point abnormal distribution information. When the target fusion point set is obtained, it is necessary to retrieve the fusion point abnormal distribution information in the data management module and correspond one-to-one with the known optical fiber space coordinate index. In order to complete this process, it is necessary to first establish a set of coordinate mapping tables covering the specific positions of each fusion point in the system. The mapping table is often obtained through precise measurement or factory calibration during laser assembly, and is associated with the number of each fusion point in the storage unit. When the fusion point abnormal distribution information indicates that mode interference or scattering anomalies are detected within a certain coordinate range, the algorithm will locate the corresponding fusion point number in the mapping table according to the range, and merge a group of abnormal points with a higher concentration in the coordinate area as output. If reflection anomalies occur between adjacent coordinate nodes, adjacency analysis will be performed, and these closely adjacent fusion points will be regarded as a higher priority abnormal section, and the section number will be indicated when output. This positioning process often uses the geometric data of the fiber path and the recorded gain distribution data to associate the coordinate span with the anomaly amplitude, and finally forms an index list of the target splice set, which contains the absolute spatial coordinates of each splice, the corresponding anomaly index, and the necessary reference spectrum information. Through this coordinate positioning process, the system can accurately lock the area that is most susceptible to reflection interference reported in the splice anomaly distribution information, avoiding indiscriminate subsequent adjustments to the entire fiber range. At this time, the upstream and downstream coordinates of the splice will be retained in the index list to consider the impact of the beam direction on the heat accumulation of the splice in the energy correction and thermal management design. When the target splice set is generated, the data management module will pass the set to the next level of pump energy correction unit.

[0034] Specifically, the local pump energy of the pump source corresponding to the target splice set is corrected, and when the pump power allocation instruction is obtained, the available output range of each pump source and its current working state need to be obtained in the control unit. This process can be based on the stored device parameter table, which marks the maximum output power, minimum safe power and applicable wavelength range of each pump source. After locating the target splice set, the control software will retrieve the pump channels connected or affected by these splices, and set the output of the corresponding channel to the state to be corrected. The correction process needs to redistribute the pump energy through linear or nonlinear equations based on the abnormal amplitude in the abnormal distribution information and the configured optical power reference value of each pump source. If a splice shows high reflection interference, the algorithm will reduce the output power of the relevant pump source in the area, or transfer part of the energy to other wavelength channels that are not sensitive to other splices in a multi-wavelength pumping environment. If further refined control is required, a safety redundancy factor can be added to the original power allocation to prevent excessive local reduction from causing instability in the overall output of the system. After completing the parameter calculation, the control software writes the allocation results into the pump power allocation instruction, which contains the output power, modulation mode and spectral channel selection of each pump source for the target welding point, and is accompanied by the necessary timing synchronization information. After the instruction is generated, it will be sent to the hardware driver module, which adjusts the pump power supply current or the driving voltage of the laser diode according to the instruction, so that the local pump energy received by the target welding point section can be accurately corrected.

[0035] Specifically, when the pump power allocation instruction is coupled with the thermal management method of the fusion point area to obtain refined cooling and heat dissipation instructions, it is necessary to retrieve the aforementioned pump power allocation information and the heat dissipation configuration parameters inside the optical fiber at the control level at the same time. When the fiber laser is running at high power, more heat will be gathered at the fusion point, and the distribution of the heat around the optical fiber is often uneven, which can easily cause local overtemperature. In order to avoid damage to the fusion point or refractive index distortion caused by local overheating, it is necessary to integrate the correction result of the pump power with the state of the cooling subsystem in the thermal management module. When implementing this process, the algorithm predicts the heat load at the corresponding fusion point according to the specific output level of the pump power allocation instruction, and allocates appropriate cooling channels and air volume or water flow in the cooling subsystem. If some fusion points have a high abnormal index, the thermal management module will set a higher cooling priority for them, and reduce the temperature of the fusion point area by increasing the coolant flow rate or using additional thermoelectric cooling sheets, thereby preventing further excitation of micro-reflections due to thermal stress. This coupling adjustment process can also correct the estimated heat distribution according to the absorption attenuation coefficient of each wavelength in the case of multi-wavelength pumping, making the cooling channel allocation more targeted. After generating refined cooling and heat dissipation instructions, the control unit will send them to the cabinet heat dissipation or external circulation cooling module. The instructions include the cooling flow, temperature control set point and expected temperature range corresponding to each key welding point.

[0036] Specifically, the pump power allocation instructions are recombined according to the refined cooling and heat dissipation instructions. When the local control parameters are obtained, the actual feasible cooling capacity fed back by the cooling subsystem needs to be combined with the previous pump power allocation under the same scheduling logic for recalibration. This process is usually performed by a central controller, which balances the real-time temperature data output by a set of temperature detectors with the pump power target to ensure that when the predetermined cooling flow is not enough to suppress all high-power sections, some pump outputs can be fine-tuned or delayed to avoid heat accumulation. The recombining process checks the difference between the actual cooling capacity currently obtained by each target welding point and the corrected pump allocation value. If the local cooling redundancy is obviously insufficient at a certain place, the pump source power is reduced twice or injected in a time-sharing manner during the relatively idle period of other welding points in the same band to maintain the overall beam output quality. The local control parameter file finally output includes the terminal output power of each pump channel, the corresponding modulation waveform, and the temperature safety range setting of the key welding point. This file is sent to the driver and the cooling system for parallel execution, ensuring that the pumping and cooling operations can form a mutually coordinated operating mode in both time and space.

[0037] Furthermore, the correction processing of the local pump energy of the pump source corresponding to the target welding point set to obtain the pump power allocation instruction includes: performing parameter reading processing on the output of each pump source associated with the target welding point set to obtain original pump power data; performing difference calculation processing on the energy demand of the welding point section according to the original pump power data to obtain a power deviation value; fitting the power deviation value with the adjustable remaining pump energy of the pump source to obtain temporary power allocation data; and performing safety threshold verification processing on the temporary power allocation data to obtain a pump power allocation instruction.

[0038] Specifically, when the parameters of each pump source output associated with the target welding point set are read and processed to obtain the original pump power data, it is necessary to pre-record the key parameters such as the current output power, the maximum power available, and the corresponding working wavelength range of each pump source in the control unit. The process first obtains the real-time values ​​of the working current, output optical power, and modulation duty cycle of the relevant pump source one by one through the communication interface with the pump driver, and then writes these values ​​into the temporary buffer area, and makes a mapping relationship according to the coordinates or number of the target welding point. Since there are often multiple parallel pump sources in the same laser system, it is necessary to synchronize the data of each channel with the timestamp to ensure that the time base can be unified when calculating the energy difference later. After the parameters of all pump sources are read, a comprehensive data table containing output power, available margin, and wavelength attributes will be formed in the system memory, so that the actual working status of each pump source can be accurately identified in the next difference calculation.

[0039] Specifically, when the energy demand of the welding point section is calculated and processed according to the original pump power data, the previously generated target welding point set needs to be correlated and compared with the pump power data when the power deviation value is obtained. For each welding point, the algorithm will infer the current required correction power based on the abnormal distribution information of the welding point, that is, the ideal pump level that the welding point should maintain when there is no abnormal reflection. This ideal level can be determined by historical experimental data, the best coupling efficiency or safe working range recorded in the reference database. Subsequently, the system will check whether the current pump output for the welding point is too high or too low based on the original pump power data, and subtract the two to obtain the power deviation value. If a welding point detects a significant reflection anomaly, the required correction power will also be relatively reduced to alleviate the heat accumulation and scattering enhancement caused by excessive local energy. After calculating the power deviation of each welding point, the algorithm will list the deviation results in a table according to the coordinate or number order. The table contains the difference data of all pump sources associated with each target welding point, and records the reduction or increase required when the set threshold is exceeded.

[0040] Specifically, the power deviation value is fitted with the remaining adjustable pump energy of the pump source, and when the temporary power allocation data is obtained, it is necessary to comprehensively consider the remaining output capacity of each pump source and the energy demand gap of the welding point. This step is implemented based on multi-objective optimization or linear programming ideas, and all power deviation values ​​are regarded as constraints to be met or reduced, and the remaining adjustable power space of each pump source is regarded as a resource to be allocated, and the two are fitted. The specific implementation can first sort the power deviation of each welding point, give priority to the welding points with more serious reflection anomalies or larger demand fluctuations, and then gradually match other welding points in the remaining power margin. If the adjustable power of a certain pump source is not enough to meet the needs of multiple welding points, it will be allocated item by item according to the predetermined priority, and the remaining adjustable power of the pump source will be updated after the allocation is completed. Through a cyclic iteration approach, the system can integrate the output correction of each welding point and its corresponding pump source to generate temporary power allocation data after numerical convergence. The data records the final output level and modulation mode of each pump source, and classifies and saves this information in a communicative instruction format.

[0041] Specifically, when the temporary power allocation data is subjected to a safety threshold verification process and a pump power allocation instruction is obtained, it is necessary to confirm that the allocation results of all pump sources do not exceed the system hardware limit or the safe working range before the correction instruction is finally issued. During the verification process, the control software first checks whether each pump source exceeds its maximum allowable output power or minimum safe output power, and adjusts the setting value that exceeds the range back to the feasible range. Subsequently, by matching the real-time temperature read by the sensor with the upper limit of the safe temperature preset by the system, it is checked whether insufficient heat dissipation due to excessive power will occur at certain fusion points. If the risk is found to be too great, the algorithm will reduce the output of the pump source again until it meets the safety limit. For a multi-wavelength pumping environment, it is also necessary to ensure that there will be no gain competition caused by energy concentration at a certain wavelength. Therefore, the control software will compare the actual injection power of each wavelength with the corresponding absorption characteristics in the optical fiber. If a single wavelength outputs excessively, the temporary allocation data will be rebalanced. After all the verifications are completed, the remaining temporary allocation data that meets the safety threshold and completes the wavelength balance is officially upgraded to a pump power allocation instruction. The instruction is formatted into a set of executable commands and sent to the pump source driver. The driver adjusts the current or oscillator parameters according to the command to make the output power and wavelength distribution reach the verified distribution level, thus forming a pump power distribution scheme that can operate safely in the high-power fiber laser system.

[0042] 104. According to the local control parameters, the overall output power of the fiber laser is collaboratively calibrated to obtain the target beam output.

[0043] In one embodiment of the present invention, the overall output power of the fiber laser is collaboratively calibrated according to the local control parameters to obtain the target beam output, including: segmented merging of the local control parameters to obtain power adjustment commands involving the multi-stage amplification unit inside the fiber laser; matching and scheduling the gain fiber and related couplers in the fiber laser according to the power adjustment command to obtain multi-channel output power instructions; comparing the multi-channel output power instructions with the real-time power readings output by the terminal monitoring module of the fiber laser to obtain power deviation information; redistributing the multi-channel output power instructions according to the power deviation information, and outputting the target beam of the fiber laser based on the redistributed multi-channel output power instructions.

[0044] Specifically, when the local control parameters are processed in a segmented manner and the power adjustment command involving the multi-stage amplification unit inside the fiber laser is obtained, it is necessary to first receive a set of scattered and independent control information in the control system. These control information usually come from the previous integration results of the micro-reflection of the fusion point, the pump energy distribution and the thermal management strategy. In order to effectively integrate this set of information into an executable power adjustment command, the control software will classify the local control parameters according to the arrangement order of the multi-stage amplification units inside the fiber laser, and each partition usually corresponds to one or more amplification stages or pump source modules. When partitioning, it is necessary to combine the gain characteristics and coupler positions of each amplification unit to package those physically related parameters into a set to ensure that the local control parameters in the same amplification stage can be corrected together. Subsequently, the control software will perform a merge operation on the control instructions of each partition according to dimensions such as time or frequency, and check whether the power targets of adjacent sections are mutually exclusive or excessive during the merging process. When it is found that the output requirements of adjacent sections for the same amplification stage are too large, the algorithm will set a segmented transition zone to reconcile the two to a compatible level through numerical interpolation or linear transition. If there are different pump wavelengths or different pulse timings in a multi-channel parallel amplifier structure, the merging process also needs to record the wavelength or timing correspondence to avoid overlapping conflicts in the same amplifier unit. When all segments are merged, the system will generate a set of association tables in the memory to display the target power value of each amplifier level at different times or wavelengths, and write this association table into the data structure of the power adjustment command. This command often uses a centralized format that can be uniformly parsed in multi-stage amplifier units.

[0045] Specifically, according to the power adjustment command, the gain fiber and the related coupler in the fiber laser are matched and scheduled, and when the multi-channel output power instruction is obtained, it is necessary to enable each amplifier stage or each pump source to read the command fragment suitable for itself at the hardware execution level. The operation first retrieves the power adjustment command output in the previous step in the management software, and assigns appropriate working parameters to each amplifier stage according to the gain fiber position and coupler number marked therein. At this time, the control program will load a specific gain coefficient or target amplification factor for each gain fiber according to the topological structure of the fiber laser, and set the coupling ratio at the coupler to ensure that light beams of different wavelengths or different pulses can flow in each gain segment. If there is a coupler responsible for merging multi-channel pump energy into the same gain fiber, it is necessary to clearly specify the timing arrangement or duty cycle of each channel of energy during scheduling to avoid internal friction or excessive coupling during coupling and cause nonlinear effects. After the scheduling module generates an execution list, it will call the driver interface to issue instructions to each amplifier unit and coupler, and the instructions contain specific amplification gain, coupling ratio and corresponding safety parameter settings. The execution time is usually aligned with the system clock to ensure that each unit completes parameter loading within the same laser working cycle. In multi-wavelength lasers, the matching scheduling process distinguishes the gain priorities of different wavelengths according to the power adjustment command, and sets the splitting ratio at the coupler level so that the energy of each wavelength is injected into the gain fiber according to the specified ratio.

[0046] Specifically, when the multi-channel output power instruction is compared with the real-time power reading output by the terminal monitoring module of the fiber laser, and the power deviation information is obtained, it is necessary to enable the online detection function in the system monitoring link, which obtains the actual output power through a high-precision power meter or beam quality monitor installed at the output end. The monitoring module transmits the measured power reading back to the control host at each working cycle or triggering moment, and the host calculates the difference between the command power and the measured power against the previously generated multi-channel output power instruction. When the difference exceeds a certain range, it indicates that the amplifier stage or coupler of the channel fails to accurately execute the established target, or the gain fiber may have attenuation changes under high thermal load. In order to locate the problem more clearly, the control program will generate a power matching evaluation index for each output power instruction, and compare the instruction with the actual measurement point by point. After completing the difference analysis of all channels, the system will sort the differences by size and record them in a power deviation information list. Each deviation information corresponds to a specific channel number, current time and deviation amplitude. If a certain deviation amplitude persists or increases further, an early warning message will be triggered, indicating that this channel needs to redistribute energy or check the actual working status of the gain fiber and coupler. The power deviation information will also be combined with the data of other sensors such as temperature and current for comprehensive interpretation to determine whether there is local overheating or electrical abnormality inside the fiber laser. In this way, under high-power output conditions, the execution effect of multiple instructions can be guaranteed through real-time comparison and deviation information can be formed.

[0047] Specifically, according to the power deviation information, the multi-channel output power instruction is redistributed, and when the target beam of the fiber laser is output based on the redistributed multi-channel output power instruction, the control system needs to dynamically fine-tune each channel with deviation, and perform priority correction for the deviation with larger amplitude. The redistribution process combines the power deviation information with the power adjustment command of the previous step at the algorithm level, and determines whether there are still unused adjustable resources or reserved safety margins in each channel. If the output of a channel is too high and the deviation is positive, the system will reduce the power quota of the channel and transfer it to other channels with surplus or demand during redistribution; if the output is too low and the deviation is negative, it will be supplemented to the channel when there is energy surplus in other channels to achieve dynamic balance between channels. After the redistribution is completed, a new multi-channel output power instruction will be generated, and these revised instructions will be sent to the amplification unit and coupler for implementation in the next laser working cycle. At the hardware execution level, each pump source or coupler control unit will confirm that the new instruction does not exceed the hardware limit or heat dissipation capacity through numerical comparison, and then immediately update the corresponding current, modulation and coupling ratio parameters. In this way, the fiber laser can perform closed-loop adjustments based on real-time monitoring data when working at high power to ensure optimal output power distribution, thereby achieving more stable and higher-quality target beam output. The redistribution mechanism can be continuously carried out in multiple pulse cycles or continuous working mode during the overall operation process until the power deviation of all channels is reduced to a reasonable range, forming dynamic stability in the time dimension.

[0048] In this embodiment, micro-reflection data is obtained by performing high-sensitivity monitoring on the beam transmission path in the internal welding point area of ​​the fiber laser; multi-angle analysis and processing are performed on the characteristic waveform and mode coupling signal in the micro-reflection data according to the pre-stored optical reference information to obtain the corresponding abnormal distribution information of the welding point; local pump energy and thermal management methods in the welding point area are directional-adjusted according to the abnormal distribution information to obtain local control parameters; and the overall output power of the fiber laser is coordinated and calibrated according to the local control parameters to obtain the target beam output. The present invention can more accurately detect and suppress micro-reflection of the welding point through the coordinated cooperation of the above-mentioned monitoring analysis and directional adjustment, which has a significant effect on the stable output of the beam of the high-power fiber laser.

[0049] The control method of the optical fiber laser in the embodiment of the present invention is described above. The control device of the optical fiber laser in the embodiment of the present invention is described below. Figure 2 , an embodiment of the control device of the optical fiber laser in the embodiment of the present invention includes: The high-sensitivity monitoring module 201 is used to perform high-sensitivity monitoring processing on the light beam transmission path of a preset area inside the fiber laser to obtain micro-reflection data, wherein the preset area is a welding point area; A multi-angle analysis module 202 is used to perform multi-angle analysis and processing on the characteristic waveform and mode coupling signal in the micro-reflection data according to the pre-stored optical reference information to obtain the corresponding abnormal distribution information of the welding point; A directional adjustment module 203 is used to perform directional adjustment processing on the local pump energy and thermal management method of the welding point area according to the abnormal distribution information of the welding point to obtain local control parameters; The collaborative calibration module 204 is used to perform collaborative calibration processing on the overall output power of the fiber laser according to the local control parameters to obtain a target beam output.

[0050] In an embodiment of the present invention, the control device of the fiber laser runs the control method of the fiber laser described above, and the control device of the fiber laser obtains micro-reflection data by performing high-sensitivity monitoring processing on the beam transmission path of the internal welding point area of ​​the fiber laser; performs multi-angle analysis processing on the characteristic waveform and mode coupling signal in the micro-reflection data according to the pre-stored optical reference information to obtain the corresponding abnormal distribution information of the welding point; performs directional adjustment processing on the local pump energy and thermal management method of the welding point area according to the abnormal distribution information to obtain local control parameters; and then performs collaborative calibration processing on the overall output power of the fiber laser according to the local control parameters to obtain the target beam output. The present invention can more accurately detect and suppress micro-reflection of the welding point through the coordinated cooperation of the above-mentioned monitoring analysis and directional adjustment, which has a significant effect on the stable output of the beam of the high-power fiber laser.

[0051] above Figure 2 The control device of the optical fiber laser in the embodiment of the present invention is described in detail from the perspective of modular functional entities. The control device of the optical fiber laser in the embodiment of the present invention is described in detail from the perspective of hardware processing.

[0052] Figure 3It is a structural schematic diagram of a control device for a fiber laser provided by an embodiment of the present invention. The control device 300 for the fiber laser may have relatively large differences due to different configurations or performances, and may include one or more processors (central processing units, CPU) 310 (for example, one or more processors) and a memory 320, and one or more storage media 330 (for example, one or more mass storage device terminals) storing application programs 333 or data 332. Among them, the memory 320 and the storage medium 330 can be short-term storage or permanent storage. The program stored in the storage medium 330 may include one or more modules (not shown in the figure), and each module may include a series of instruction operations in the control device 300 of the fiber laser. Furthermore, the processor 310 may be configured to communicate with the storage medium 330, and execute a series of instruction operations in the storage medium 330 on the control device 300 of the fiber laser to implement the steps of the above-mentioned control method of the fiber laser.

[0053] The fiber laser control device 300 may also include one or more power supplies 340, one or more wired or wireless network interfaces 350, one or more input and output interfaces 360, and / or one or more operating systems 331, such as Windows Serve, Mac OS X, Unix, Linux, FreeBSD, etc. It will be appreciated by those skilled in the art that Figure 3 The structure of the control device for the optical fiber laser shown does not constitute a limitation on the control device for the optical fiber laser provided by the present invention, and may include more or less components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0054] The present invention also provides a computer-readable storage medium, which may be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium. Instructions are stored in the computer-readable storage medium. When the instructions are executed on a computer, the computer executes the steps of the control method of the optical fiber laser.

[0055] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, device, or unit can refer to the corresponding process in the aforementioned method embodiment and will not be repeated here.

[0056] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0057] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling a fiber laser, characterized in that: The control method of the fiber laser comprises: Performing high-sensitivity monitoring processing on the beam transmission path of a preset area inside the fiber laser to obtain micro-reflection data, wherein the preset area is a welding point area; Performing multi-angle analysis and processing on the characteristic waveform and mode coupling signal in the micro-reflection data according to the pre-stored optical reference information to obtain corresponding abnormal distribution information of the welding point; According to the abnormal distribution information of the welding points, the local pump energy and thermal management method of the welding point area are directional adjusted to obtain local control parameters; According to the local control parameters, the overall output power of the fiber laser is collaboratively calibrated to obtain a target beam output.

2. The control method of the optical fiber laser according to claim 1, characterized in that: The high-sensitivity monitoring process of the light beam transmission path of the preset area inside the fiber laser to obtain micro-reflection data includes: A multi-channel detection end is configured for the preset area, and optical signals of different wavelengths and different polarization states are synchronously collected and processed by the multi-channel detection end to obtain multi-dimensional optical sampling information for characterizing local scattering changes; Performing segmented threshold filtering on the background optical noise of the multi-dimensional optical sampling information to obtain a preliminary reflection detection result, wherein the preliminary reflection detection result includes a candidate interval for indicating that a reflection pulse may exist and a corresponding time index; Performing time domain comparison processing on the pulse positions of each candidate interval according to the time index in the preliminary reflection detection result to obtain the intensity distribution of the reflection signal; According to the intensity distribution of the reflection signal, correlation matching processing is performed on the multi-dimensional optical sampling information, and corresponding effective reflection peak position and amplitude information are screened out from the multi-dimensional optical sampling information based on a matching index to obtain micro-reflection data.

3. The control method of the optical fiber laser according to claim 1, characterized in that: The multi-angle analysis and processing of the characteristic waveform and the mode coupling signal in the micro-reflection data according to the pre-stored optical reference information to obtain the corresponding abnormal distribution information of the welding point includes: Performing waveform deconstruction processing on the characteristic waveform in the micro-reflection data to obtain continuous spectrum fragments and discrete energy peak information; According to the continuous spectrum fragments and the discrete energy peak information, a mode mapping process is performed on a reference database to obtain a suspected sub-mode coupling index; Performing joint comparison processing on the sub-mode coupling index and the mode coupling signal of the micro-reflection data to obtain a mode interference mark on the local time axis; The pre-stored optical reference information is subjected to difference analysis processing according to the pattern interference mark to obtain abnormal distribution information of the welding points.

4. The control method of the optical fiber laser according to claim 3, characterized in that: The performing difference analysis processing on the pre-stored optical reference information according to the pattern interference mark to obtain the abnormal distribution information of the welding points includes: Performing index reading processing on the temporal and spatial positions of the pattern interference marks to obtain an interference position set for indicating interference moments and interference section boundaries; Performing multi-dimensional comparison processing on pre-stored optical reference information according to the interference position set to obtain difference distribution data for representing the difference in interference intensity; Performing anomaly threshold screening processing on the difference distribution data to obtain potential anomalies; According to the potential abnormal items, the spatial coordinates of the welding points in the welding point area are subjected to association mapping processing to obtain abnormal distribution information of the welding points.

5. The control method of the optical fiber laser according to claim 1, characterized in that: According to the abnormal distribution information of the welding points, the local pump energy and thermal management method of the welding point area are directional adjusted to obtain the local control parameters including: Positioning the welding point coordinates in the welding point area according to the abnormal distribution information of the welding points to obtain a target welding point set; Correcting the local pump energy of the pump source corresponding to the target welding point set to obtain a pump power allocation instruction; The pump power allocation instruction is coupled and adjusted with the thermal management method of the welding point area to obtain refined cooling and heat dissipation instructions; The pump power allocation instructions are recombined according to the refined cooling and heat dissipation instructions to obtain local control parameters.

6. The control method of the optical fiber laser according to claim 5, characterized in that: The correcting the local pump energy of the pump source corresponding to the target welding point set to obtain the pump power allocation instruction includes: Performing parameter reading processing on each pump source output associated with the target welding point set to obtain original pump power data; Performing difference calculation processing on the energy demand of the welding point section according to the original pump power data to obtain a power deviation value; Performing fitting processing on the power deviation value and the adjustable remaining pump energy of the pump source to obtain temporary power allocation data; A safety threshold verification process is performed on the temporary power allocation data to obtain a pump power allocation instruction.

7. The control method of the optical fiber laser according to claim 1, characterized in that: The collaborative calibration process of the overall output power of the fiber laser according to the local control parameters to obtain the target beam output includes: The local control parameters are merged in sections to obtain power adjustment commands involving the multi-stage amplification units inside the fiber laser; According to the power adjustment command, matching and scheduling processing is performed on the gain fiber and the related coupler in the fiber laser to obtain multi-channel output power instructions; Comparing the multi-channel output power instructions with the real-time power readings output by the terminal monitoring module of the optical fiber laser to obtain power deviation information; The multi-path output power instructions are redistributed according to the power deviation information, and the target beam output of the optical fiber laser is performed based on the redistributed multi-path output power instructions.

8. A control device for a fiber laser, characterized in that: The control device of the optical fiber laser comprises: A high-sensitivity monitoring module is used to perform high-sensitivity monitoring processing on the light beam transmission path of a preset area inside the fiber laser to obtain micro-reflection data, wherein the preset area is a welding point area; A multi-angle analysis module, used to perform multi-angle analysis and processing on the characteristic waveform and mode coupling signal in the micro-reflection data according to pre-stored optical reference information, so as to obtain corresponding abnormal distribution information of welding points; A directional adjustment module, used to perform directional adjustment processing on the local pump energy and thermal management method of the welding point area according to the abnormal distribution information of the welding point, so as to obtain local control parameters; The collaborative calibration module is used to perform collaborative calibration processing on the overall output power of the fiber laser according to the local control parameters to obtain a target beam output.

9. A control device for a fiber laser, characterized in that: The control device of the optical fiber laser comprises: a memory and at least one processor, wherein instructions are stored in the memory; The at least one processor calls the instructions in the memory to enable the control device of the fiber laser to perform the steps of the control method of the fiber laser according to any one of claims 1 to 7.

10. A computer-readable storage medium having instructions stored thereon, characterized in that: When the instructions are executed by the processor, the steps of the method for controlling a fiber laser according to any one of claims 1 to 7 are implemented.

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