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

邱丽云; 温静; 冯曦; 陈鸿; 林宏奂; 李玮

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

doi: 10.11884/HPLPB202638.260049

邱丽云^1,,
温静²,
冯曦²,
陈鸿¹,
林宏奂²,
李玮^1, ,

1.
四川大学电子信息学院激光微纳工程研究所，成都 610065
2.
中国工程物理研究院激光聚变研究中心，四川绵阳 621900

基金项目: 国家自然科学NSAF联合基金项目(U2230127)

详细信息

作者简介:
邱丽云，yunhexi2001@163.com

通讯作者:
李　玮，weili@scu.edu.cn。

中图分类号: TN248.1
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- 文章访问数: 41
- HTML全文浏览量: 21
- PDF下载量: 10
- 被引次数: 0
出版历程
- 收稿日期: 2026-02-12
- 修回日期: 2026-03-18
- 录用日期: 2026-03-12
- 网络出版日期: 2026-04-13

Study on mechanisms of thermally induced combining performance degradation in two-stage cascaded segmented-mirror-splitters coherent combining systems

Qiu Liyun^1
,,
Wen Jing²,
Feng Xi²,
Chen Hong¹,
Lin Honghuan²,
Li Wei^{1
, ,}

1.
Institute of Laser and Micro/Nano Engineering, College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China
2.
Laser Fusion Research Center, CAEP, Mianyang 621900, China

摘要

摘要: 在高功率分段镜分束器（SMS）相干合成系统中，光学元件残余吸收引起的热效应是制约系统稳态合成性能的关键因素。针对高功率两级级联SMS系统中热致性能退化机制研究不足的问题，基于有限元法建立了28路光-热-力多物理场耦合模型，数值模拟了多光束在“之”字形光路中的热致波前畸变及光束叠加过程。结果表明，激光功率沿合成方向的逐级累积使第二级分段镜的热负载显著高于第一级，形成明显的非对称温度梯度，从而诱导光束质量的在合成方向上的显著退化。对系统参数的优化分析进一步表明，适当减小基底厚度可抑制热畸变，提升合成效率并改善光束质量；增大子束间距虽能降低热叠加效应并提高合成功率，但会加剧光束质量的各向异性退化。
- 相干合成 /
- 分段镜分束器 /
- 热效应 /
- 合成效率 /
- 光束质量
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 a critical factor that limits 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,
Methods
we established a 28-channel optical-thermal-mechanical multi-physics coupling model using the finite element method. Numerical 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.
- coherent beam combining /
- segmented-mirror-splitters /
- thermal effect /
- combining efficiency /
- beam quality

HTML全文

图 1 基于二维SMS的28路相干合成系统示意图

Figure 1. Schematic diagram of the 28-channel two-dimensional SMS-based CBC system

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图 2 光束合束器中表面吸收和体吸收的物理模型

Figure 2. Physical models of surface and bulk absorption in the beam combiner

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图 3 分段镜M₁和M₃的稳态温度场分布图

Figure 3. Steady-state temperature distributions on segmented mirror M₁ and M₃

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图 4 分段镜M₁和M₃的稳态热变形场分布图

Figure 4. Steady-state thermal deformation distributions on segmented mirror M₁ and M₃

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图 5 不同基底厚度下M₁和M₃横截面的稳态温度分布图

Figure 5. Cross-sectional steady-state temperature distributions on M₁ and M₃ for different substrate thicknesses

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图 6 不同基底厚度下M₁和M₃横截面的稳态热变形分布图

Figure 6. Cross-sectional steady-state thermal deformation distributions on M₁ and M₃ for different substrate thicknesses

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图 7 不同基底厚度下合成效率和光束质量的仿真结果

Figure 7. Simulation results of combining efficiency and beam quality for different substrate thicknesses

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图 8 不同子束间距下M₁的PR膜层表面温度和热变形分布图

Figure 8. Temperature and thermal deformation distributions on the PR coating surfaces of M₁ for different sub-beam spacings

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图 9 不同子束间距下M₃的PR膜层表面温度和热变形分布图

Figure 9. Temperature and thermal deformation distributions on the PR coating surfaces of M₃ for different sub-beam spacings

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图 10 不同子束间距下SMS₂横截面的热变形分布图

Figure 10. Cross-sectional thermal deformation distributions on SMS₂ for different sub-beam spacings

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图 11 不同子束间距下合成效率和光束质量的仿真结果

Figure 11. Simulation results of combining efficiency and beam quality for different sub-beam spacings

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表 1 二维SMS相干合成系统中光学元件的几何参数

Table 1. Geometric parameters of the optical components in the two-dimensional SMS-based CBC system

beam combiner	optical component	length L /mm	width W /mm	thickness H /mm
SMS₁	segmented mirror (M₁)	160	157	20
SMS₁	HR mirror (M₂)	160	126	20
SMS₂	segmented mirror (M₃)	251	40	20
SMS₂	HR mirror (M₄)	220	40	20

下载: 导出CSV

表 2 基底材料的热物理参数(康宁7980熔融石英玻璃)^[26]

Table 2. Thermophysical parameters of the substrate material (corning 7980 fused silica)^[26]

density/ (g·cm⁻³)	specific heat/ (J·g⁻¹·K⁻¹)	thermal conductivity/ (W·m⁻¹·K⁻¹)	Young’s modulus/ GPa	Poisson’s ratio	thermal expansion/K⁻¹	thermo-optical coefficient/K⁻¹	refractive index
2.20	0.77	1.38	73	0.16	0.57×10⁻⁶	9.6×10⁻⁶	1.45

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表 3 光学元件的吸收系数

Table 3. Absorption coefficients of optical components

α_AR^[27]	α_bulk/cm^−1[27]	α_HR^[28]	α_PR^[29]
1.2×10⁻⁶	19.0×10⁻⁶	4.0×10⁻⁶	10.0×10⁻⁶

下载: 导出CSV

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