Collimation control system and method based on wave aberration optimization

Abstract

The application discloses a collimation regulation system and method based on wave aberration optimization, relates to the technical field of collimation regulation, and obtains a thermal response time starting point by determining the phase offset trend of a thermal spot appearing instant and the relationship between thermal flow distribution and wavefront distortion; energy section regulation is implemented on a light beam irradiation area according to the time starting point, an intermittent energy release process is established by introducing thermal flow distribution results; on this basis, phase drift of a turning mirror reflection area is tracked, and the angle distribution order of an optical path is adjusted; a phase steady-state maintenance process is constructed in combination with the angle distribution order, the wavefront recovery duration is prolonged; collimation self-balancing regulation of the light beam is implemented in the thermal spot back-falling stage, and the convergence of the phase and the incident angle rhythm is realized. The application establishes a time directional collimation regulation mechanism with the wavefront change as the core, cooperates energy and phase control in the whole process of thermal spot formation and back-falling, suppresses phase mutation and optical axis drift, maintains wavefront continuity and energy center consistency, and realizes long-term stability of the collimation state.

Description

Technical Field

[0001] This invention relates to the field of collimation control technology, specifically to a collimation control system and method based on wave aberration optimization. Background Technology

[0002] Collimation control based on wavefront aberration optimization refers to achieving high-precision collimation control of the optical axis, focal length, and field of view by analyzing and correcting the wavefront aberration distribution of the optical system in real time during the assembly and operation of the collimation system. Its core idea is to use wavefront aberration as a sensitive indicator of optical performance and minimize it as the collimation target. The system first uses an interferometer or wavefront sensor to measure the wavefront error of the primary mirror, secondary mirror, and folding mirror combination, obtaining RMS and PV values ​​under different fields of view. Then, combined with structural adjustment mechanisms, such as primary mirror pitch, secondary mirror off-axis angle, inter-mirror spacing, and focal plane fine-tuning, it corrects the geometric deviations that cause wavefront distortion item by item. Through iterative optimization, the RMS of the central field of view can be controlled within λ / 20, and the half-field of view within λ / 15. Throughout the process, wavefront aberration optimization is not only used to determine the direction of imaging error but also guides the fine-tuning of the angle and position of each mirror through changes in interference fringes, ensuring high parallelism and low distortion of the outgoing beam, ultimately obtaining a collimated light field close to an ideal plane wave.

[0003] This method is essentially an adaptive collimation correction process driven by minimizing wavefront error, which can achieve dynamic optimization of optical axis consistency and imaging surface flatness under complex off-axis structures.

[0004] The existing technology has the following shortcomings:

[0005] During collimation control, the folding mirror is prone to localized hot spots under prolonged high-energy beam irradiation. Uneven heat distribution on the coating surface can trigger abrupt changes in the refractive index of micro-regions, leading to nonlinear phase response jumps and unpredictable phase tearing bands. Although this phenomenon is extremely short-lived, it causes instantaneous optical axis shift, resulting in short-term speckle drift and energy distribution disorder in the parallel beam, thus affecting wavefront stability and collimation accuracy. If such phase tearing bands repeatedly occur during multiple thermal cycles, fatigue accumulation in the coating structure will lead to permanent shifts in the local reflection characteristics of the folding mirror, ultimately causing long-term drift in the system's collimation state and a decline in imaging quality.

[0006] The information disclosed in the background section is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a collimation control system and method based on wave aberration optimization to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a collimation control method based on wavelet aberration optimization, comprising the following steps:

[0009] Step 1: Collect wavefront variation data of the folding mirror under different light intensities. Based on the collected wavefront variation data, determine the phase shift trend at the moment the hot spot appears, and extract the correspondence between heat flux distribution and wavefront distortion to determine the starting point of the thermal response time of the folding mirror under high-energy light.

[0010] Step 2: Based on the determined thermal response time starting point, perform segmented energy control on the beam irradiation area, and introduce the heat flow distribution results in the obtained wavefront change data into the irradiation rhythm to establish an intermittent energy release process, so as to reduce the accumulation of local thermal stress and suppress the further expansion of hot spots.

[0011] Step 3: Based on the execution of energy segmentation control, drift tracking is performed on the phase change of the reflection area of ​​the folding mirror. The angle allocation order of the optical path is adjusted according to the difference in wavefront change data before and after, so as to promote the wavefront to become continuous and smooth.

[0012] Step 4: Combine the angle allocation sequence obtained from phase drift tracking to construct the phase steady-state maintenance process, extend the duration of wavefront recovery during the highly sensitive stage of heat diffusion, and maintain the stable transition of the optical axis by synchronously adjusting the incident angle rhythm.

[0013] Step 5: Based on the phase steady-state maintenance process, implement self-balancing control of beam collimation during the hot spot fall-off stage, synchronize the phase drift tracking and incident angle rhythm adjustment results, restore the consistency of the energy distribution center, eliminate the regeneration conditions of the phase tear zone, and maintain the long-term stability of the collimation control process.

[0014] Preferably, determining the starting point of the thermal response time of the folding mirror under high-energy light illumination includes the following steps:

[0015] The reflection area of ​​the folding mirror is set with a multi-level increment of beam illumination intensity, and corresponding wavefront change data are collected under different illumination intensities to form a continuous wavefront change dataset.

[0016] Based on the wavefront variation dataset, the wavefront variation data corresponding to different light intensities within the same irradiation cycle are compared and analyzed to determine the phase shift trend at the moment the hot spot appears.

[0017] By combining the phase shift trend with the spatial distribution information in the wavefront variation dataset, regional analysis of wavefront distortion morphology at different time points is performed to extract the correspondence between heat flow distribution and wavefront distortion.

[0018] Based on the correspondence between heat flux distribution and wavefront distortion, the characteristic change points in the heat flux distribution curve and the characteristic change points in the phase shift trend are matched in time to determine the starting point of the thermal response time of the folding mirror under high-energy light irradiation.

[0019] Preferably, based on the determined thermal response time starting point, segmented energy control is performed on the beam irradiation area, including the following steps:

[0020] Using the determined thermal response time start point as the starting reference for energy segmentation control, the energy input of the beam irradiation area is planned in stages, and the duration, energy density and irradiation sequence of each energy segment are set according to the heat flow distribution characteristics reflected in the wavefront change data.

[0021] Based on the phased planning results and combined with the heat flow distribution results reflected in the wavefront change data, a rhythm control process for beam irradiation is constructed, and the irradiation start time and irradiation interruption time are set according to the characteristic changes in the heat flow distribution curve.

[0022] Based on the matching relationship between energy segmentation planning and irradiation rhythm control, intermittent energy release regulation is performed on the beam irradiation area, and the time correspondence between heat input and heat diffusion is maintained by adjusting the irradiation sequence and energy distribution ratio in each energy segment.

[0023] Preferably, when performing intermittent energy release regulation, the irradiation start time, irradiation interruption time and energy distribution ratio in each energy segment are adjusted according to the time variation characteristics of heat flux distribution in the wavefront change data, and the temporal correlation between the thermal response time start point and the irradiation rhythm is maintained in the continuous irradiation cycle.

[0024] Preferably, adjusting the angle allocation order of the optical path based on the differences in wavefront change data includes the following steps:

[0025] Based on the implementation of energy segmented control, the phase changes of the reflected beam in different energy segments are continuously recorded using the reflection area of ​​the folding mirror as the monitoring range, forming a wavefront change data sequence arranged in time.

[0026] Based on the wavefront change data sequence, the differences between wavefront change data in adjacent time periods are compared, and the spatial distribution characteristics of the phase drift region are determined by combining the heat flow distribution information in the wavefront change data.

[0027] Based on the spatial distribution characteristics of the phase drift region, the angle allocation order of the optical path is adjusted, and the priority order of optical path adjustment is determined according to the phase drift direction and phase offset amplitude.

[0028] Preferably, when adjusting the angle allocation sequence of the optical path, the execution timing of the optical path angle adjustment is synchronously limited according to the order of appearance of the phase drift region on the time axis in the wavefront change data sequence, so as to maintain the time correspondence between the angle allocation sequence and the irradiation rhythm of energy segmentation control.

[0029] Preferably, the phase steady-state maintenance process is constructed by combining the angle assignment order obtained from phase drift tracking, including the following steps:

[0030] Based on the angle allocation order obtained from phase drift tracking, the delay of the wavefront recovery process is adjusted, and the duration of wavefront recovery is divided into time segments by combining the thermal response time start point and the heat flow distribution characteristics reflected in the wavefront change data.

[0031] Based on the time-division results and the angle allocation sequence, the rhythm of the incident beam angle change is synchronously adjusted, and the incident angle change sequence is correlated with the wavefront recovery process.

[0032] Based on the rhythm of the angle change and the order of the angle distribution of the incident beam, the thermal diffusion process in the reflection area of ​​the folding mirror is balanced and adjusted, and the phase recovery characteristics of each region in the wavefront change data are combined to control the thermal diffusion time sequence.

[0033] Based on the results of thermal diffusion balance adjustment, and combined with the angle distribution sequence and the rhythm of angle change of the incident beam, the optical axis direction is continuously adjusted to maintain a stable transition of the optical axis during the wavefront recovery process.

[0034] Preferably, the time division of wavefront recovery duration, the synchronous adjustment of the angle change rhythm of the incident beam, and the continuous adjustment of the optical axis direction are all uniformly constrained based on the angle allocation sequence obtained by phase drift tracking, and the time correspondence is kept consistent during the highly sensitive stage of heat diffusion, so as to maintain the continuity of the wavefront and the consistency of the optical axis transition during the phase steady state maintenance process.

[0035] Preferably, the self-balancing control of beam collimation during the hot spot fall-off phase includes the following steps:

[0036] During the hot spot fallback phase, the heat release process in the reflection area of ​​the folding mirror is continuously recorded, and the energy fallback characteristics are analyzed in correspondence with the wavefront change data to establish the time correspondence between energy fallback and wavefront recovery.

[0037] Based on the time correspondence, and combined with the adjustment results of the phase change direction and incident angle rhythm obtained from phase drift tracking, the wavefront change and incident angle change are synchronously converged.

[0038] Based on the synchronous convergence results, the energy distribution center of the beam is adjusted to maintain the consistency of the energy distribution center and eliminate the regeneration conditions of the phase tear band.

[0039] The collimation control system based on wavefront aberration optimization includes a wavefront thermal response determination module, an energy segmentation control module, a phase drift tracking module, a phase steady-state maintenance module, and a collimation self-balancing control module.

[0040] The wavefront thermal response determination module collects wavefront change data of the folding mirror under different light intensities, determines the phase shift trend at the moment the hot spot appears based on the collected wavefront change data, and extracts the correspondence between heat flux distribution and wavefront distortion to determine the starting point of the thermal response time of the folding mirror under high-energy light.

[0041] The energy segmentation control module performs energy segmentation control on the beam irradiation area based on the determined thermal response time starting point, and introduces the heat flow distribution results in the obtained wavefront change data into the irradiation rhythm to establish an intermittent energy release process.

[0042] The phase drift tracking module, based on the execution of energy segmented control, performs drift tracking on the phase changes of the reflection area of ​​the folding mirror, and adjusts the angle allocation order of the optical path according to the difference in wavefront change data before and after.

[0043] The phase steady-state maintenance module combines the angle allocation sequence obtained from phase drift tracking to construct the phase steady-state maintenance process, extending the duration of wavefront recovery during the highly sensitive stage of heat diffusion;

[0044] The collimation self-balancing control module, based on the phase steady-state maintenance process, implements beam collimation self-balancing control during the hot spot fall-off stage, and synchronously converges the phase drift tracking and incident angle rhythm adjustment results.

[0045] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0046] This invention uses wavefront variation data as the core control basis, continuously linking the thermal response time start point, energy segmentation control, phase drift tracking, and phase steady-state maintenance process. This transforms collimation control from a passive correction to a time-directed dynamic control process. Under high-energy illumination, it can respond to abnormal wavefront changes in the early stages of hotspot formation, preventing phase abrupt changes from further amplifying into optical axis shift and energy disturbance. This maintains the continuity and stability of the wavefront throughout the entire illumination cycle, ensuring consistent collimation accuracy even in complex thermal disturbance environments.

[0047] This invention introduces a self-balancing control mechanism for beam collimation during the hot spot fallback phase. This mechanism synchronizes the phase drift tracking results with the incident angle rhythm adjustment, ensuring that the energy distribution center remains consistent in time and space, thus preventing the recurrence of phase tearing bands. Through this cyclical wavefront and energy co-control method, the cumulative optical axis drift caused by thermal cycling can be effectively mitigated, maintaining long-term stability of the collimation state and ensuring reliable imaging quality and energy transmission consistency during long-term operation. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0049] Figure 1 This is a flowchart of the collimation control method based on wave aberration optimization according to the present invention.

[0050] Figure 2 The flowchart of the method for determining the starting point of thermal response time in this invention is shown below;

[0051] Figure 3 This is a flowchart of the method for performing segmented energy control on the beam irradiation area according to the present invention;

[0052] Figure 4 This is a schematic diagram of the collimation control system based on wave aberration optimization according to the present invention. Detailed Implementation

[0053] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art.

[0054] This invention provides, for example Figures 1 to 3 The collimation control method based on wave aberration optimization shown includes the following steps:

[0055] Step 1: Collect wavefront variation data of the folding mirror under different light intensities. Based on the collected wavefront variation data, determine the phase shift trend at the moment the hot spot appears, and extract the correspondence between heat flux distribution and wavefront distortion to determine the starting point of the thermal response time of the folding mirror under high-energy light.

[0056] The specific steps for determining the starting point of the thermal response time of the folding mirror under high-energy light illumination are as follows:

[0057] In the initial stage of collimation control, the illumination environment of the folding mirror's reflection area is preset, setting multi-level increments of beam illumination intensity, typically uniformly distributed within a specified energy density range, allowing the folding mirror surface to undergo a complete process from low-power to high-power illumination. During illumination, the wavefront changes of the emitted beam are recorded in real time using an interferometer, wavefront sampler, or other optical wavefront analysis equipment. The wavefront morphology, wavefront phase distribution, and phase difference data changing over time under different illumination intensities are stored as a time series. To ensure the temporal continuity of the data, a stable incremental state of beam output is maintained during the adjustment of illumination power, allowing the thermal response of the folding mirror surface at each intensity level to be fully acquired. The recorded content includes the wavefront surface morphology, phase difference change curve, interference fringe spacing, wavefront distortion distribution profile, and illumination energy input, thus forming a complete wavefront change dataset corresponding to different illumination intensities. This wavefront change dataset reflects the real-time changes in the optical performance of the folding mirror during energy input.

[0058] After acquiring continuous wavefront variation data, comparative analysis was performed on wavefront variation data under different illumination intensities within the same irradiation cycle. By comparing the phase distribution changes of the wavefront at different time intervals, the moments when local phase abrupt changes occurred in the reflected beam of the folding mirror were observed. When phase jumps, fringe breaks, or abrupt changes in phase distribution occurred in local regions of the wavefront variation data, it indicated the formation of a hot spot and the beginning of perturbation of the wavefront. Based on this change characteristic, the phase shift trend at the instant the hot spot appeared was determined, including parameters such as the shift direction, shift amplitude, and duration. During the analysis, a wavefront response sequence was established with time as the horizontal axis and wavefront phase change as the vertical axis. By observing the change law of the phase change rate under different irradiation intensities, the specific time interval of phase shift and the correspondence between illumination intensity were extracted. Through this process, the temporal characteristics of the wavefront changing from a stable state to a perturbed state when the folding mirror surface is exposed to high-energy light can be accurately described, forming a phase shift trend curve at the instant the hot spot appears. This phase shift trend curve is used to characterize the dynamic relationship between thermal energy accumulation and optical wavefront changes, providing a temporal coordinate basis for subsequent heat flux distribution extraction.

[0059] It should be noted that:

[0060] When the phase change of wavefront variation data in a local area exceeds the preset threshold comparison standard, it is determined that a phase jump, stripe breakage, or abrupt change in phase distribution has occurred in that area. This indicates that a hot spot has formed and has begun to disturb the wavefront.

[0061] The preset threshold comparison standard can be set based on the reference wavefront change data of the folding mirror under stable low-power illumination conditions. Specifically, wavefront phase data for a continuous period is first collected under conditions of no thermal disturbance or thermal equilibrium. The fluctuation range of phase change within this period is statistically analyzed, and the maximum fluctuation amplitude is taken as the upper limit of the reference fluctuation. Then, combined with the system's allowable collimation error range, this upper limit of the reference fluctuation is multiplied by a predetermined amplification factor to obtain the phase change threshold. When the phase change in a local area exceeds this threshold at two or more consecutive time points, accompanied by a disruption of interference fringe continuity or a sudden increase in phase gradient, the preset threshold comparison standard is determined to have been met. By using stable-state data as a reference and combining it with collimation accuracy requirements, this method ensures that the threshold reflects abnormal changes caused by actual thermal disturbances while avoiding misinterpreting normal, minor fluctuations as phase jumps.

[0062] After obtaining the phase shift trend of hotspot appearance, the phase shift trend curve is combined with the spatial distribution information in the wavefront variation dataset to perform regional analysis of wavefront distortion morphology at different time points, extracting the correspondence between heat flux distribution and wavefront distortion. Specifically, regions in the wavefront data where local phase changes exceed the upper limit of the phase change threshold are tracked and analyzed to determine the location and trajectory of these regions in the time series. By comparing the curvature difference of wavefront distortion at adjacent time points, the diffusion direction and range of heat flux on the surface of the folding mirror are determined. Simultaneously, the irradiation power input record is time-synchronized with the spatial distribution of wavefront distortion to analyze the correspondence between the rate of change of heat flux distribution during surface diffusion and the intensity of wavefront distortion. This process reveals the dynamic coupling relationship between light energy input and wavefront distortion, forming a heat flux transfer description with time as the main axis and spatial distribution as the characteristic. Through the precise extraction of the correspondence between heat flux and wavefront distortion, the synchronous change relationship between thermal energy diffusion and wavefront response on the folding mirror surface can be obtained, providing a direct basis for determining the starting point of the thermal response time.

[0063] It should be noted that:

[0064] When analyzing regions in wavefront data where local phase changes exceed the upper limit of the phase change threshold, the location and trajectory of these regions in the time series can be determined by comparing wavefront distribution data from continuous time series. Specifically, two-dimensional data of the wavefront phase distribution are recorded at each time node. The data from consecutive time nodes are superimposed and compared. When the phase change amplitude of a certain region consistently exceeds the upper limit of the phase change threshold across multiple time nodes, that region is identified as an active area of ​​heat flow. By tracking the spatial shift of this active region over time, the propagation path of heat on the surface of the folding mirror can be determined. When the center of the region diffuses outward between adjacent time nodes and the phase change gradually weakens, it indicates that the heat flow is spreading in that direction; if the phase change is concentrated and the region boundary contracts, it indicates that the heat flow is locally accumulating within that range. By continuously recording the evolution of these spatial locations, the main diffusion direction of heat flow on the surface of the folding mirror and the specific range of the heat-affected zone can be determined.

[0065] The upper limit of the phase change threshold can be set based on the reference wavefront phase fluctuation range under thermal equilibrium conditions, combined with the allowable error of collimation accuracy. Specifically, under low-power stable irradiation conditions, two-dimensional wavefront phase data for a continuous period are first collected. The maximum phase fluctuation value at each sampling point within this period is statistically analyzed, and this maximum fluctuation value is used as the background fluctuation reference value. Then, considering the system's allowable wavefront error control range, this reference value is multiplied by 1.5 to 2 to obtain the upper limit of the phase change threshold. For example, if the maximum natural phase fluctuation value in a certain region during benchmark testing is 0.02λ, the upper limit of the threshold can be set to 0.03λ or 0.04λ. When the phase change in this region continuously exceeds 0.03λ for two or more consecutive time points, it is determined that it exceeds the upper limit of the phase change threshold and enters the range of heat flow effect analysis, where λ is the wavelength of the light source. This setting method, based on actual stable fluctuation data and appropriately amplified, can effectively distinguish between normal micro-phase fluctuations and abnormal phase changes caused by heat flow.

[0066] After obtaining the correspondence between heat flux distribution and wavefront distortion, the starting point of the thermal response time of the folding mirror under high-energy illumination is determined based on this correspondence. Specifically, the location of the first local peak in the heat flux distribution curve is selected as the initial reference point and matched with the initial inflection point of the phase shift trend curve in the wavefront change data. When the two feature points coincide or appear adjacently on the time axis, this moment marks the starting point when the heat on the folding mirror surface begins to enter a non-uniform diffusion state, i.e., the starting point of the thermal response time. The corresponding illumination intensity, wavefront distortion, and phase shift amplitude are recorded simultaneously, forming the determination result of the starting point of the thermal response time. In this way, the transition time when the thermal energy accumulation on the folding mirror surface changes from an equilibrium state to a perturbed state can be clearly identified. The determined starting point of the thermal response time serves as the benchmark input for subsequent segmented energy control, guiding the temporal allocation of the illumination energy rhythm. Determining this starting point of the thermal response time ensures that the energy input and wavefront response remain consistent in the time dimension during subsequent collimation control, avoiding the expansion of wavefront distortion caused by continuous heat accumulation.

[0067] By executing the above steps sequentially, a complete time-series response analysis process is formed, from wavefront variation data acquisition, phase shift trend identification, extraction of the relationship between heat flux and wavefront distortion, to determination of the thermal response time starting point. Throughout the process, wavefront variation data serves as the main thread, with adjustments to illumination intensity, capture of phase changes, and extraction of heat flux distribution all revolving around this data, ensuring a continuous mapping relationship from optical response to thermal response. Each step is based on specific measurement results, establishing the temporal characteristics of the folding mirror's optical response through continuous temporal and spatial analysis. The finally determined thermal response time starting point provides time calibration for energy segmentation control, phase drift tracking, and steady-state optical axis maintenance in the collimation control method, enabling subsequent control processes to use the true starting point of the thermal response as the control basis.

[0068] Step 2: Based on the determined thermal response time starting point, perform segmented energy control on the beam irradiation area, and introduce the heat flow distribution results in the obtained wavefront change data into the irradiation rhythm to establish an intermittent energy release process, so as to reduce the accumulation of local thermal stress and suppress the further expansion of hot spots.

[0069] Based on the determined thermal response time starting point, segmented energy control is performed on the beam irradiation area. The specific steps are as follows:

[0070] Once the thermal response time starting point is determined, it serves as the initial reference for segmented energy control, allowing for phased planning of the energy input to the beam-irradiated area. During implementation, the illumination energy is divided into multiple continuous energy segments along the time axis. The duration, energy density, and irradiation sequence of each segment are set segment by segment based on the heat flow distribution characteristics reflected in the wavefront variation data. To ensure the temporal continuity of the thermal diffusion process on the folding mirror surface, a smooth transition between adjacent energy segments is maintained during energy segmentation, ensuring coordination between changes in illumination intensity and the thermal diffusion response. During energy segmentation planning, the time of the heat flow peak is used as the inflection point of energy input based on the phase fluctuation trend in the wavefront variation data, thereby adjusting the beam irradiation duration and energy release ratio. The power density and duration of each energy segment are adjusted step-by-step according to the thermal response characteristics of the folding mirror reflection area, ensuring that the heat input of each energy segment matches the heat flow diffusion capacity of that stage, thus achieving a balance between energy input and heat release. During the execution of segmented planning, the response of wavefront change data within each energy segment is continuously recorded as the basis for subsequent rhythm control, so that the energy input process forms an orderly distribution in time and ensures that the heat diffusion is evenly distributed in space.

[0071] After energy segmentation planning is completed, a rhythm control process for beam irradiation is constructed based on the heat flow distribution results reflected in the wavefront variation data. This rhythm control, based on energy segmentation, combines the irradiation sequence of each energy segment with the thermal response cycle of the folding mirror to achieve synchronous adjustment of the illumination process and the heat diffusion process. In specific implementation, within each energy segment, the start and stop times of beam irradiation are set according to the time interval of local peaks in the heat flow distribution curve, forming an alternating irradiation rhythm. During the irradiation start phase, the beam irradiates the folding mirror reflector according to the planned energy density, and heat flow begins to accumulate in the irradiation area; during the irradiation stop phase, the beam energy input stops, and heat on the folding mirror surface diffuses radially, releasing local heat. By periodically switching the irradiation state, heat is rhythmically inputted and released in the time dimension, avoiding the continuous accumulation of heat and the resulting thermal stress concentration. The irradiation rhythm is adjusted based on the relationship between the starting point of the thermal response time and the duration of each energy segment. When the heat flow distribution curve shows periodic fluctuations, the ratio of the irradiation time interval to the beam power is adjusted to keep the irradiation rhythm synchronized with the heat diffusion time. Through this rhythm control process, the light input and heat diffusion response form a closed loop in time, so that the heat flux peak can be released in each cycle, and the wavefront change process is stably controlled.

[0072] After the irradiation rhythm control is established, intermittent energy release regulation is performed on the beam irradiation area based on the matching relationship between energy segmentation planning and irradiation rhythm. This process achieves coordinated regulation of energy release and heat diffusion in continuous irradiation cycles. By adjusting the order and interval of beam energy release, a balanced state of heat transfer within the reflection area of ​​the folding mirror is established. In implementation, each irradiation cycle of the energy segment is divided into a thermal excitation stage and a thermal diffusion stage. During the thermal excitation stage, the beam irradiation energy is kept constant, allowing the heat flow distribution reflected in the wavefront variation data to gradually reach a stable state. During the thermal diffusion stage, the beam irradiation intensity is reduced, and the no-irradiation interval is extended, allowing heat to diffuse naturally radially on the surface of the folding mirror, slowing down the accumulation rate of the local thermal gradient. Within continuous cycles, the time ratio of the thermal excitation and thermal diffusion stages is dynamically adjusted according to the heat flow peak variation law, so that the heat flow forms a uniform distribution on the surface of the folding mirror, preventing the aggravation of wavefront distortion due to prolonged heating of a single area. During intermittent energy release, the heat flow distribution results are synchronously compared with the wavefront variation data. By controlling the irradiation sequence and energy distribution ratio of each energy segment, the folding mirror maintains a time correspondence between heat input and heat release in multiple cycles. As the multi-cycle energy release process proceeds, the surface temperature distribution of the folding mirror gradually stabilizes, and the phase shift trend in the wavefront variation data slows down, indicating that segmented energy control achieves dynamic equilibrium in the thermal field distribution.

[0073] It should be noted that:

[0074] When implementing intermittent energy release regulation, the boundary between the heat flux growth phase and the heat flux decay phase within the current energy segment is first determined based on the time-varying slope of the heat flux distribution curve in the wavefront change data. When the heat flux distribution curve enters the rising range and the phase change rate begins to accelerate, the irradiation start time is set within a preset time window after the start of the thermal response time, ensuring that the energy input is synchronized with the initial heat flux accumulation phase. When the heat flux distribution curve reaches a local peak and an inflection point appears, the irradiation interruption time is set at the corresponding time nodes before and after the inflection point, stopping the energy input at the beginning of the heat flux diffusion phase, thereby preventing further heat accumulation. Regarding the adjustment of the energy distribution ratio, the change in the peak heat flux amplitude between two adjacent time periods is considered. The power density of each energy segment is redistributed according to the proportional relationship of peak amplitude. The power density corresponding to the energy segment with a large increase in heat flux peak amplitude is reduced proportionally, while the power density corresponding to the energy segment with a high degree of heat flux diffusion completion is replenished proportionally, so that the input energy of each energy segment matches the heat diffusion capacity within that time period. In the continuous irradiation cycle, the starting point of the thermal response time is always used as the time reference, and the irradiation start time and irradiation interruption time in each cycle are aligned and calibrated to ensure that the time series of the irradiation rhythm corresponds to the periodic changes of the heat flux distribution curve. This forms a stable start-stop-diffusion cycle rhythm over multiple cycles, achieving a continuous correlation between the energy input rhythm and the time characteristics of heat flux.

[0075] Through the above steps, energy segmentation planning, irradiation rhythm setting, and intermittent energy release regulation together constitute a time-continuous and synchronously responsive energy input control process. This process uses the thermal response time starting point as the core control point, incorporating the heat flow distribution results from wavefront variation data into the irradiation rhythm. By adjusting the correspondence between beam energy input and the thermal diffusion process in a time-segmented manner, a balanced regulation between the thermal field state and wavefront variation is achieved. The energy segmentation planning stage determines the distribution law of energy input in the time dimension; the irradiation rhythm setting stage establishes the time matching relationship between energy input and thermal diffusion; and the intermittent energy release regulation stage forms a dynamic closed loop of heat transfer, ensuring that the heat release on the folding mirror surface remains synchronous with the wavefront stability. The entire process ensures that the beam irradiation area can maintain a stable thermal equilibrium state under continuous high-energy illumination conditions, suppressing the expansion of hot spots in time and space.

[0076] Step 3: Based on the execution of energy segmentation control, drift tracking is performed on the phase change of the reflection area of ​​the folding mirror. The angle allocation order of the optical path is adjusted according to the difference in wavefront change data before and after, so as to promote the wavefront to become continuous and smooth.

[0077] The optical path angle allocation order is adjusted based on the differences in wavefront variation data. The specific steps are as follows:

[0078] After the energy segmentation control is completed, the phase change process of the reflected beam in different energy release stages is continuously recorded, using the reflection area of ​​the folding mirror as the monitoring range. Specifically, a fixed time interval is selected within the energy segmentation irradiation cycle, and the wavefront change data of the reflected beam from the folding mirror is collected chronologically, recording the wavefront morphology, phase distribution, and spatial distribution of wavefront distortion. Each time point corresponds to an energy release stage, and the collected data covers the entire process from energy input to heat diffusion. To ensure the temporal continuity of the recording results, the incident conditions of the beam are kept constant within the irradiation cycle, so that each recording reflects the natural changes in the thermal response of the folding mirror surface. The collected data includes changes in the interference fringes of the wavefront within the reflection area, local abrupt changes in the phase distribution, and the distortion morphology of the wavefront surface in space. By continuously recording the wavefront changes within multiple irradiation cycles, a set of wavefront change data sequences arranged chronologically can be formed, reflecting the dynamic trajectory of the phase response of the folding mirror surface as heat flow changes. The wavefront change data in each time series contains optical wavefront distribution information within the reflection area of ​​the folding mirror, providing basic data for subsequent phase drift tracking.

[0079] After acquiring phase change data in the folding mirror reflection area, the wavefront change data within adjacent time periods are compared. Specifically, the wavefront change data from the previous energy segment irradiation cycle is time-aligned with the wavefront change data from the next energy segment irradiation cycle. The phase value changes at each spatial point are compared to identify the range and direction of the phase drift region. Within the phase drift region, the continuity of the wavefront shifts due to differences in heat flux distribution. By comparing the spatial offset of the wavefront surface and the phase difference, the center position and propagation path of the phase drift are determined. During the comparison process, the heat flux distribution information in the wavefront change data is combined with the phase offset results to analyze whether the direction of heat flux diffusion is consistent with the direction of phase drift. When a sudden change in phase difference occurs in the wavefront change data, the stage of phase drift is determined by tracking the rate of change of the phase change curve, and the time node of the drift occurrence is correlated with the energy segment irradiation rhythm. In this way, a spatial mapping relationship between heat flux diffusion and wavefront phase change within the folding mirror reflection area can be established, making the phase drift characteristics traceable on both the time and space axes. After comparative analysis, the direction vector, amplitude range, and distribution range of phase drift are obtained. These results serve as a reference for adjusting the optical path angle allocation order, providing a parameter basis for achieving wavefront continuity restoration.

[0080] After obtaining the spatial distribution of wavefront drift, the angle allocation order of the optical path is adjusted based on the differences in wavefront change data before and after. This process uses phase drift tracking results as a basis, dividing the phase drift region within the reflection area of ​​the folding mirror into multiple optical path adjustment units, and determining the priority order of optical path adjustment according to the drift direction and phase shift amplitude. Specifically, the region with the largest phase drift in the wavefront change data is first used as the adjustment starting point, and the exit angle of the reflected beam is adjusted accordingly. During the adjustment process, using the phase drift center as a reference, the angles of adjacent beams are fine-tuned according to the drift direction, so that the reflected beams reconverge into the continuous wavefront region. Time synchronization is maintained during the angle adjustment process to ensure that the timing of the optical path angle allocation adjustment is consistent with the energy segmentation irradiation rhythm, preventing the angle adjustment from becoming disconnected from the thermal diffusion process. After the adjustment is completed, the phase drift region is continuously tracked. When the phase difference between adjacent regions in the wavefront change data gradually decreases, it indicates that the continuity of the wavefront has been restored. To ensure the wavefront remains continuous and smooth throughout the reflection region, the optical path angles are adjusted progressively from the center outwards, following the spatial distribution trend of the wavefront variation data. This ensures a smooth phase transition after the beam is reflected by the folding mirror. As the angle allocation sequence is completed, wavefront drift within the folding mirror reflection region gradually disappears, the wavefront shape of the reflected beam returns to a continuous distribution, the energy transmission path remains stable, and the optical axis direction remains consistent after multiple reflections.

[0081] Through the implementation of the above steps, phase change capture, wavefront difference comparison, and optical path angle allocation adjustment form a complete phase drift tracking process. This process combines the thermal rhythm of the energy segmentation control stage with the time response characteristics of wavefront change data, enabling optical path adjustment and thermal diffusion processes to proceed synchronously, thereby achieving stable wavefront transmission of the reflected beam under high-energy illumination conditions. Through the coordinated execution of phase drift tracking and optical path angle adjustment, the wavefront shift caused by heat flow within the folding mirror reflection area is dynamically corrected, maintaining the continuity of the wavefront morphology and ensuring the stability of the optical axis direction under multi-cycle illumination conditions. This lays the foundation for subsequent phase stability maintenance and beam collimation self-balancing control.

[0082] Step 4: Combine the angle allocation sequence obtained from phase drift tracking to construct the phase steady-state maintenance process, extend the duration of wavefront recovery during the highly sensitive stage of heat diffusion, and maintain the stable transition of the optical axis by synchronously adjusting the incident angle rhythm.

[0083] The phase steady-state maintenance process is constructed by combining the angle assignment order obtained from phase drift tracking. The specific steps are as follows:

[0084] After obtaining the angle allocation sequence formed during phase drift tracking, the wavefront recovery process is delayed and adjusted based on this sequence. In practice, the thermal diffusion time of the reflective region of the toroidal mirror is compared with the wavefront recovery time. The wavefront recovery stage is divided into multiple time periods according to the time interval corresponding to each angle adjustment in the angle allocation sequence. Within each time period, the duration of wavefront recovery is determined by combining the thermal response time starting point obtained from the previous energy segmentation control with the heat flow distribution characteristics reflected in the wavefront change data, ensuring that thermal diffusion and wavefront adjustment extend synchronously. For stages with faster heat diffusion, the wavefront recovery time within each time period is appropriately shortened to maintain a continuous transition between the heat conduction process on the toroidal mirror surface and the wavefront response process. For stages with slower heat diffusion, the wavefront recovery duration is extended to ensure that heat completes diffusion within the reflective region before entering the next stage of optical path adjustment. Through this time-division control method, the wavefront recovery time corresponds to the thermal diffusion time, and the stable recovery of the wavefront morphology is synchronized with the changes in the temperature distribution on the toroidal mirror surface. After each time period ends, the morphological changes of the wavefront change data are recorded to form a time series of wavefront recovery, providing a time reference for subsequent adjustment of the incident angle rhythm.

[0085] After extending the wavefront recovery duration, the angle change rhythm of the incident beam is synchronously adjusted based on the angle allocation sequence obtained from phase drift tracking. In practice, each angle adjustment point in the angle allocation sequence serves as a timing reference for the incident angle change. The incident angle change rhythm is set within each thermal diffusion cycle to ensure the beam's incident direction is synchronized with the wavefront recovery process. When thermal diffusion enters the high-energy conduction stage, the frequency of incident angle adjustment increases accordingly, maintaining consistency between the beam's incident angle change and the heat flow conduction direction on the folding mirror surface. When thermal diffusion is in the energy release stage, the incident angle adjustment frequency is appropriately reduced to match the beam's direction change with the energy fallback time of thermal diffusion. Each incident angle adjustment is strictly executed according to the angle allocation sequence, ensuring consistency between the optical path direction change and the response speed of the wavefront recovery curve. Within multiple consecutive thermal diffusion cycles, the adjustment of the incident angle rhythm and the wavefront recovery time work together to create a rhythmic response on the folding mirror surface during thermal diffusion, ensuring a continuous transition of the wavefront in time without abrupt changes. By synchronously controlling the incident angle rhythm, the beam forms a continuous phase transition path after reflection by the folding mirror, and the heat diffusion and optical response processes are coordinated in time.

[0086] After synchronizing the incident angle rhythm with wavefront recovery, the heat diffusion process is balanced and adjusted based on the angle distribution sequence. During implementation, the surface of the folding mirror is divided into multiple thermal response regions. The temporal sequence of heat diffusion in each region is controlled according to the phase recovery rate and heat flow direction in the wavefront change data. During the wavefront recovery phase, fine-tuning the incident angle change period promotes uniform heat diffusion from the center outwards along the reflection area, preventing heat accumulation in localized areas. For regions with high energy concentration in the heat flow distribution, the time interval between beam incident angle changes is extended to allow sufficient heat conduction time. For regions with weak energy conduction in the heat flow distribution, the angle adjustment interval is shortened, and the beam direction switching frequency is increased to rebalance the heat diffusion process. This balancing adjustment method maintains the temporal symmetry of energy distribution on the folding mirror surface during the highly sensitive phase of heat diffusion, ensuring continuous wavefront recovery is not disturbed by localized heat fluctuations. Throughout the entire heat diffusion cycle, the phase gradient of the wavefront change data gradually decreases, the phase distribution of the reflected beam remains consistent, and the wavefront recovery process and the heat diffusion process achieve a coordinated state.

[0087] After completing the thermal diffusion balance adjustment, the steady-state maintenance process of the optical axis is implemented, based on the angle allocation sequence and incident angle rhythm established in the preceding steps. Specifically, the adjustment of the optical axis direction corresponds to the duration of the wavefront recovery phase. Within each time period of wavefront recovery, the transition speed of the optical axis direction is controlled according to the change pattern of the incident angle. By continuously tracking the offset of the optical axis direction in the wavefront change data, the offset is compared with the wavefront recovery speed. When the optical axis offset increases, the amplitude of the incident angle change is gradually reduced. During the wavefront recovery acceleration phase, the incident angle adjustment range is appropriately increased to keep the optical axis direction synchronized with the wavefront recovery process. Throughout the entire wavefront recovery phase, the adjustment of the optical axis direction remains continuously changing in time, without abrupt jumps or interruptions. When switching energy input to the next irradiation cycle, the optical axis direction of the previous cycle is used as the initial reference, ensuring a smooth transition between the optical axis adjustment and the new wavefront recovery phase. Through this continuous transition method, the beam propagation path remains stable, the outgoing direction after reflection by the folding mirror is consistent with the incident direction, and as the wavefront recovery process is completed, the optical axis gradually returns to a stable state, the propagation path of the reflected beam forms a fixed spatial trajectory, and the optical axis stability is maintained throughout the entire collimation control period.

[0088] Through the above process, wavefront delay recovery achieves temporal extension of the wavefront morphology, synchronizing the thermal diffusion process with the wavefront recovery process; incident angle rhythm synchronization ensures coordinated execution of beam direction changes and thermal diffusion cycles; thermal diffusion balance adjustment, through dual regulation in time and space, achieves dynamic equilibrium between energy distribution and wavefront recovery; and optical axis steady-state maintenance transforms these control results into a continuous optical output state, ensuring that the reflective area of ​​the folding mirror remains wavefront stable and aligned with the optical axis during the highly sensitive phase of thermal diffusion. The entire process uses the angle allocation sequence as the core control basis, and the temporal coordination of the thermal diffusion process and wavefront changes as the means. Through the continuous implementation of delay recovery, rhythm synchronization, thermal balance, and steady-state maintenance, it ensures that the folding mirror maintains phase balance and optical axis stability under long-term high-energy illumination conditions.

[0089] Step 5: Based on the phase steady-state maintenance process, implement self-balancing control of beam collimation during the hot spot fall-off stage, synchronize the phase drift tracking and incident angle rhythm adjustment results, restore the consistency of the energy distribution center, eliminate the regeneration conditions of the phase tearing zone, and maintain the long-term stability of the collimation control process.

[0090] During the hot spot fallback phase, self-balancing control of beam collimation is implemented, and the specific steps are as follows:

[0091] At the start of the hot spot fallback phase, the heat release process in the reflective region of the toroidal mirror is continuously recorded, and the energy fallback characteristics are analyzed in correspondence with the wavefront response. During implementation, the energy distribution changes in the reflective region of the toroidal mirror are monitored using the wavefront recovery curve during the phase steady-state maintenance phase as a reference. During the heat fallback phase, thermal diffusion occurs from the center outward on the surface of the toroidal mirror, and the change in energy density is reflected in the wavefront change data as a gradual convergence of the phase gradient. By recording the correspondence between wavefront phase changes and energy fallback rates at different time points, the synchronization degree of wavefront recovery can be determined. When a region of delayed recovery is found in the wavefront curve within a certain time period, it indicates that the thermal diffusion rate and energy release rate in that region are not fully matched. In this case, by adjusting the time segmentation of the energy fallback phase, the wavefront recovery period is correlated with the heat release time, so that thermal diffusion and wavefront recovery are coordinated in time. The adjustment of each time segment is performed based on the actual heat flow changes within the reflective region of the toroidal mirror, gradually shortening the gap between the thermal diffusion transition phase and the wavefront recovery lag. This gradual adjustment ensures that the energy release maintains symmetrical diffusion in space, and the wavefront change process is continuous and smooth, providing a stable data foundation for subsequent phase and angle synchronous convergence.

[0092] After establishing the time correspondence between energy fallback and wavefront response, the phase and angle synchronization convergence phase begins. During this process, the wavefront phase change direction obtained in the phase drift tracking phase is synchronized with the angle change parameters determined in the incident angle rhythm adjustment phase, ensuring the beam propagation path in the folding mirror reflection region remains dynamically stable. In practice, based on the previously obtained phase change data, the wavefront change data within each time segment is correlated with the incident angle rhythm change curve to ensure consistency in their time series. In the early stages of the energy fallback cycle, the phase change rate is faster, and the incident angle adjustment rhythm is correspondingly accelerated to ensure synchronization between wavefront recovery and incident direction change. In the later stages of energy fallback, the phase change tends to stabilize, and the incident angle adjustment frequency gradually decreases, allowing the beam to maintain a stable propagation state at the end of the wavefront recovery phase. For regions with slight phase shifts in the wavefront change data, the incident angle change step size is reduced to weaken the rate of change in the beam direction, thereby restoring the correspondence between the wavefront curve and the beam propagation direction. When the phase change curve and the incident angle rhythm curve completely coincide on the time axis, it indicates that the phase and angle synchronous convergence has reached an equilibrium state. The beam propagation direction in the reflection region is completely consistent with the wavefront recovery direction, the phase continuity in the reflection region of the folding mirror is fully restored, and energy is maintained uniformly transmitted in the propagation path. Throughout the synchronous convergence phase, the matching relationship between phase change and angle adjustment is continuously tracked, ensuring that the beam maintains wavefront continuity and optical path consistency even in the dynamic environment of energy decline.

[0093] After phase and angle convergence is complete, energy center consistency is restored to eliminate the regeneration of phase tearing bands that may be caused during the energy fallback phase. In practice, the trend of the beam energy center's position is determined by comparing wavefront change data and heat flow distribution data after phase and angle convergence. As heat diffuses outward from the center, the energy distribution center will slightly shift, causing local fluctuations in energy density along the beam propagation path. To restore energy center consistency, within each time interval of the energy fallback phase, the beam incident angle and reflection angle are slightly adjusted based on the phase center position in the wavefront change data. Specifically, when the energy distribution center is biased towards the edge of the folding mirror, the incident beam direction is appropriately adjusted to slightly compensate for the reflection angle, allowing energy to refocus in the central region; when the energy distribution center is biased towards the optical axis, the energy release time in the corresponding interval is extended to allow sufficient heat diffusion before restoring a stable incident angle rhythm, ensuring a balanced energy distribution in space. As multi-cycle adjustments and energy fallback proceed simultaneously, the beam energy center gradually returns to stability in time and space, phase fluctuations in the wavefront curve completely disappear, and the exit direction of the beam reflected by the folding mirror remains stably on the initial optical axis. After the energy center uniformity is restored, the reflected beam forms a continuous and smooth wavefront structure throughout the entire exit process, the spatial energy distribution remains uniform, the optical axis direction does not shift over a long period, the conditions for phase tearing zone regeneration are completely eliminated, and the entire collimation and control process achieves sustained wavefront stability.

[0094] Through the continuous implementation of the above steps, the self-balancing control process of beam collimation completes the reconstruction of wavefront stability and energy consistency during the hot spot fallback stage. The energy fallback and wavefront response correspondence analysis step achieves time coordination between thermal diffusion and wavefront recovery. The phase and angle synchronous convergence step ensures the time synchronization between the incident angle rhythm change and the wavefront recovery process. The energy center consistency recovery step, through fine-tuning of spatial distribution, refocuses the reflected beam energy at the center position, eliminating the risk of phase tearing caused by wavefront discontinuity. The entire self-balancing control process uses the angle distribution sequence and incident angle rhythm of the phase steady-state maintenance stage as time references. Through dynamic convergence control during the thermal diffusion and energy fallback stages, it achieves continuous wavefront recovery and long-term stability of the optical axis direction, providing a dual balance mechanism in time and space for the collimation control process. This ensures that the beam maintains stable wavefront smoothness and energy concentration even in complex thermal dynamic environments, thereby guaranteeing that the collimation accuracy remains unchanged during long-term operation.

[0095] This invention uses wavefront variation data as the core control basis, continuously linking the thermal response time start point, energy segmentation control, phase drift tracking, and phase steady-state maintenance process. This transforms collimation control from a passive correction to a time-directed dynamic control process. Under high-energy illumination, it can respond to abnormal wavefront changes in the early stages of hotspot formation, preventing phase abrupt changes from further amplifying into optical axis shift and energy disturbance. This maintains the continuity and stability of the wavefront throughout the entire illumination cycle, ensuring consistent collimation accuracy even in complex thermal disturbance environments.

[0096] This invention introduces a self-balancing control mechanism for beam collimation during the hot spot fallback phase. This mechanism synchronizes the phase drift tracking results with the incident angle rhythm adjustment, ensuring that the energy distribution center remains consistent in time and space, thus preventing the recurrence of phase tearing bands. Through this cyclical wavefront and energy co-control method, the cumulative optical axis drift caused by thermal cycling can be effectively mitigated, maintaining long-term stability of the collimation state and ensuring reliable imaging quality and energy transmission consistency during long-term operation.

[0097] This invention provides, for example Figure 4 The collimation control system based on wavefront aberration optimization shown includes a wavefront thermal response determination module, an energy segmentation control module, a phase drift tracking module, a phase steady-state maintenance module, and a collimation self-balancing control module.

[0098] The wavefront thermal response determination module collects wavefront change data of the folding mirror under different light intensities, determines the phase shift trend at the moment the hot spot appears based on the collected wavefront change data, and extracts the correspondence between heat flux distribution and wavefront distortion to determine the starting point of the thermal response time of the folding mirror under high-energy light.

[0099] The energy segmentation control module performs energy segmentation control on the beam irradiation area based on the determined thermal response time starting point, and introduces the heat flow distribution results in the obtained wavefront change data into the irradiation rhythm to establish an intermittent energy release process.

[0100] The phase drift tracking module, based on the execution of energy segmented control, performs drift tracking on the phase changes of the reflection area of ​​the folding mirror, and adjusts the angle allocation order of the optical path according to the difference in wavefront change data before and after.

[0101] The phase steady-state maintenance module combines the angle allocation sequence obtained from phase drift tracking to construct the phase steady-state maintenance process, extending the duration of wavefront recovery during the highly sensitive stage of heat diffusion;

[0102] The collimation self-balancing control module, based on the phase steady-state maintenance process, implements beam collimation self-balancing control during the hot spot fall-off stage, and synchronously converges the phase drift tracking and incident angle rhythm adjustment results.

[0103] The collimation control method based on wavefront aberration optimization provided in this embodiment of the invention is implemented through the above-described collimation control system based on wavefront aberration optimization. For details of the specific methods and processes of the collimation control system based on wavefront aberration optimization, please refer to the embodiments of the collimation control method based on wavefront aberration optimization described above, which will not be repeated here.

[0104] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A collimation control method based on wavelet aberration optimization, characterized in that, Includes the following steps: Collect wavefront variation data of the folding mirror under different light intensities; determine the phase shift trend at the moment the hot spot appears based on the collected wavefront variation data, and extract the correspondence between heat flux distribution and wavefront distortion to determine the starting point of the thermal response time of the folding mirror. Based on the determined thermal response time starting point, energy segmentation control is performed on the beam irradiation area, and the heat flow distribution results in the obtained wavefront change data are introduced into the irradiation rhythm to establish an intermittent energy release process. Based on the execution of energy segmented control, the phase change of the reflection region of the folding mirror is drift tracked, and the angle allocation order of the optical path is adjusted according to the difference of wavefront change data before and after. By combining the angle assignment order obtained from phase drift tracking, a phase steady-state maintenance process is constructed, which extends the duration of wavefront recovery during the heat diffusion stage; Based on the phase steady-state maintenance process, self-balancing control of beam collimation is implemented during the hot spot fall-off stage, and the results of phase drift tracking and incident angle rhythm adjustment are synchronously converged.

2. The collimation control method based on wave aberration optimization according to claim 1, characterized in that, Determining the starting point of the thermal response time of the folding mirror includes the following steps: The reflection area of ​​the folding mirror is set with a multi-level increment of beam illumination intensity, and corresponding wavefront change data are collected under different illumination intensities to form a continuous wavefront change dataset. Based on the wavefront variation dataset, the wavefront variation data corresponding to different light intensities within the same irradiation cycle are compared and analyzed to determine the phase shift trend at the moment the hot spot appears. By combining the phase shift trend with the spatial distribution information in the wavefront variation dataset, regional analysis of wavefront distortion morphology at different time points is performed to extract the correspondence between heat flow distribution and wavefront distortion. Based on the correspondence between heat flux distribution and wavefront distortion, the characteristic change points in the heat flux distribution curve and the characteristic change points in the phase shift trend are matched in time to determine the starting point of the thermal response time of the folding mirror.

3. The collimation control method based on wave aberration optimization according to claim 2, characterized in that, Based on the determined thermal response time start point, segmented energy control is performed on the beam irradiation area, including the following steps: Using the determined thermal response time start point as the starting reference for energy segmentation control, the energy input of the beam irradiation area is planned in stages, and the duration, energy density and irradiation sequence of each energy segment are set according to the heat flow distribution characteristics reflected in the wavefront change data. Based on the phased planning results and combined with the heat flow distribution results reflected in the wavefront change data, a rhythm control process for beam irradiation is constructed, and the irradiation start time and irradiation interruption time are set according to the characteristic changes in the heat flow distribution curve. Based on the matching relationship between energy segmentation planning and irradiation rhythm control, intermittent energy release regulation is performed on the beam irradiation area, and the time correspondence between heat input and heat diffusion is maintained by adjusting the irradiation sequence and energy distribution ratio in each energy segment.

4. The collimation control method based on wave aberration optimization according to claim 3, characterized in that, When performing intermittent energy release regulation, the irradiation start time, irradiation interruption time, and energy distribution ratio in each energy segment are adjusted according to the temporal variation characteristics of heat flux distribution in the wavefront variation data.

5. The collimation control method based on wave aberration optimization according to claim 3, characterized in that, Adjusting the optical path angle allocation order based on the differences in wavefront variation data includes the following steps: Based on the implementation of energy segmented control, the phase changes of the reflected beam in different energy segments are continuously recorded using the reflection area of ​​the folding mirror as the monitoring range, forming a wavefront change data sequence arranged in time. Based on the wavefront change data sequence, the differences between wavefront change data in adjacent time periods are compared, and the spatial distribution characteristics of the phase drift region are determined by combining the heat flow distribution information in the wavefront change data. Based on the spatial distribution characteristics of the phase drift region, the angle allocation order of the optical path is adjusted, and the priority order of optical path adjustment is determined according to the phase drift direction and phase offset amplitude.

6. The collimation control method based on wave aberration optimization according to claim 5, characterized in that, When adjusting the angle allocation order of the optical path, the execution timing of the optical path angle adjustment is synchronously limited according to the order of appearance of the phase drift region on the time axis in the wavefront change data sequence.

7. The collimation control method based on wave aberration optimization according to claim 5, characterized in that, The phase steady-state holding process is constructed by combining the angle assignment order obtained from phase drift tracking, including the following steps: Based on the angle allocation order obtained from phase drift tracking, the delay of the wavefront recovery process is adjusted, and the duration of wavefront recovery is divided into time segments by combining the thermal response time start point and the heat flow distribution characteristics reflected in the wavefront change data. Based on the time-division results and the angle allocation sequence, the rhythm of the incident beam angle change is synchronously adjusted, and the incident angle change sequence is correlated with the wavefront recovery process. Based on the rhythm of the angle change and the order of the angle distribution of the incident beam, the thermal diffusion process in the reflection area of ​​the folding mirror is balanced and adjusted, and the phase recovery characteristics of each region in the wavefront change data are combined to control the thermal diffusion time sequence. Based on the results of thermal diffusion balance adjustment, and combined with the angle distribution sequence and the rhythm of angle change of the incident beam, the optical axis direction is continuously adjusted to maintain a stable transition of the optical axis during the wavefront recovery process.

8. The collimation control method based on wave aberration optimization according to claim 7, characterized in that, The time division of wavefront recovery duration, the synchronous adjustment of the angle change rhythm of the incident beam, and the continuous adjustment of the optical axis direction are all uniformly constrained based on the angle allocation order obtained by phase drift tracking, and maintain a consistent time correspondence during the heat diffusion stage.

9. The collimation control method based on wave aberration optimization according to claim 7, characterized in that, Self-balancing control of beam collimation is implemented during the hot spot fall-off phase, including the following steps: During the hot spot fallback phase, the heat release process in the reflection area of ​​the folding mirror is continuously recorded, and the energy fallback characteristics are analyzed in correspondence with the wavefront change data to establish the time correspondence between energy fallback and wavefront recovery. Based on the time correspondence, and combined with the adjustment results of the phase change direction and incident angle rhythm obtained from phase drift tracking, the wavefront change and incident angle change are synchronously converged. Based on the synchronous convergence results, the energy distribution center of the beam is adjusted.

10. A collimation control system based on wavefront aberration optimization, used to implement the collimation control method based on wavefront aberration optimization as described in any one of claims 1-9, characterized in that, It includes a wavefront thermal response determination module, an energy segmentation control module, a phase drift tracking module, a phase steady-state maintenance module, and a collimation self-balancing control module; The wavefront thermal response determination module collects wavefront change data of the folding mirror under different light intensities, determines the phase shift trend at the moment the hot spot appears based on the collected wavefront change data, and extracts the correspondence between heat flux distribution and wavefront distortion to determine the starting point of the thermal response time of the folding mirror. The energy segmentation control module performs energy segmentation control on the beam irradiation area based on the determined thermal response time starting point, and introduces the heat flow distribution results in the obtained wavefront change data into the irradiation rhythm to establish an intermittent energy release process. The phase drift tracking module, based on the execution of energy segmented control, performs drift tracking on the phase changes of the reflection area of ​​the folding mirror, and adjusts the angle allocation order of the optical path according to the difference in wavefront change data before and after. The phase steady-state maintenance module combines the angle allocation sequence obtained from phase drift tracking to construct the phase steady-state maintenance process, extending the duration of wavefront recovery during the heat diffusion phase; The collimation self-balancing control module, based on the phase steady-state maintenance process, implements beam collimation self-balancing control during the hot spot fall-off stage, and synchronously converges the phase drift tracking and incident angle rhythm adjustment results.

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