强激光与粒子束2026，Vol.38Issue(6)：1-10,10.DOI:10.11884/HPLPB202638.260049
两级级联分段镜分束器相干合成系统的热致合成性能退化机理研究
Study on mechanisms of thermally induced combining performance degradation in two-stage cascaded segmented-mirror-splitters coherent combining systems
摘要
Abstract
[Background]In high-power coherent beam combining systems based on segmented-mirror-splitters(SMS),thermal effects arising from parasitic absorption in optical components are critical factors that limit steady-state combining performance.[Purpose]To address the limited understanding of the mechanisms underlying thermally induced performance degradation in high-power two-stage cascaded SMS systems,we established a 28-channel optical-thermal-mechanical multi-physics coupling model using the finite element method.[Methods]Nume-rical simulations were performed to analyze the thermally induced wavefront distortion and the sequential coherent superposition of multiple beams within the zig-zag optical path.[Results]The results indicate that the accumulation of laser power along the combining direction leads to a significantly higher thermal load on the second-stage segmented mirror than on the first stage.Consequently,an asymmetric temperature gradient induces substantial beam quality degradation along the combining direction.[Conclusions]Furthermore,parametric optimization demonstrates that reducing the substrate thickness can effectively suppress thermal distortion,thereby enhancing combining efficiency and improving beam quality.Meanwhile,although increasing the sub-beam spacing reduces thermal effects and enhances combined power,it simultaneously intensifies the anisotropic beam quality degradation.关键词
相干合成/分段镜分束器/热效应/合成效率/光束质量Key words
coherent beam combining/segmented-mirror-splitters/thermal effect/combining efficiency/beam quality分类
信息技术与安全科学引用本文复制引用
邱丽云,温静,冯曦,陈鸿,林宏奂,李玮..两级级联分段镜分束器相干合成系统的热致合成性能退化机理研究[J].强激光与粒子束,2026,38(6):1-10,10.基金项目
国家自然科学NSAF联合基金项目(U2230127) （U2230127）
