中国光学（中英文）2025，Vol.18Issue(3)：520-534,15.DOI:10.37188/CO.EN-2024-0022
激光内通道热晕效应的快速模拟与相位畸变评估
Rapid simulation and phase distortion evaluation of thermal blooming effect in internal laser propagation channels
摘要
Abstract
During the propagation of high-power lasers within internal channels,the laser beam heats the propagation medium,causing the thermal blooming effect that degrades the beam quality at the output.The intricate configuration of the optical path within the internal channel necessitates complex and time-consum-ing efforts to assess the impact of thermal blooming effect on the optical path.To meet the engineering need for rapid evaluation of thermal blooming effect in optical paths,this study proposed a rapid simulation meth-od for the thermal blooming effect in internal optical paths based on the finite element method.This method discretized the fluid region into infinitesimal elements and employed finite element method for flow field analysis.A simplified analytical model of the flow field region in complex internal channels was established,and regions with similar thermal blooming effect were divided within this model.Based on the calculated op-tical path differences within these regions,numerical simulations of phase distortion caused by thermal blooming were conducted.The calculated result were compared with those obtained using the existing meth-ods.The findings reveal that for complex optical paths,the discrepancy between the two approaches is less than 3.6％,with similar phase distortion patterns observed.For L-type units,this method and the existing methods identify the same primary factors influencing aberrations and exhibit consistent trends in their vari-ation.This method was used to analyze the impact of thermal blooming effect in a straight channel under dif-ferent gravity directions.The results show that phase distortion varies with changes in the direction of grav-ity,and the magnitude of the phase difference is strongly correlated with the component of gravity perpendic-ular to the optical axis.Compared to the existing methods,this approach offers greater flexibility,obviates the need for complex custom analysis programming.The analytical results of this method enable a rapid as-sessment of the thermal blooming effect in optical paths within the internal channel.This is especially useful during the engineering design.These results also provide crucial references for developing strategies to sup-press thermal blooming effect.关键词
高能激光/热晕效应/光束相位/数值模拟/热耦合效应/光束控制系统Key words
high-power laser/thermal blooming effect/beam phase/numerical simulation/thermal coupling effect/beam control system分类
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吴东宇,李响,李家晟,高亮,宋延嵩,王思,董科研..激光内通道热晕效应的快速模拟与相位畸变评估[J].中国光学（中英文）,2025,18(3):520-534,15.基金项目
吉林省科技发展计划项目(No.20230301002GX,No.20230301001GX)Supported by Science and Technology Development Project of Jilin Province,China(No.20230301002GX,No.20230301001GX) （No.20230301002GX,No.20230301001GX）
