High-precision assembly process of large-aperture laser transport mirror in the high-energy laser facility
High-precision assembly process of large-aperture laser transport mirror in the high-energy laser facility
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DOI：
10.1117/1.oe.59.11.115101
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发表时间：
2020-11
影响因子：
1.3
通讯作者：
Dongya Chu;Menjiya Tian;Yongjie Li;Hui Wang;Zheng Zhang;Tingfen Cao
中科院分区：
文献类型：
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作者：
Dongya Chu;Menjiya Tian;Yongjie Li;Hui Wang;Zheng Zhang;Tingfen Cao
摘要。针对大功率激光设备中大口径激光传输镜的表面畸变最小化问题，提出了一种大口径激光传输镜的装配设计和安装方法。首先，建立了镜面变形的理论模型。采用新的装配设计，将反射镜固定在中性平面上，通过在镜体上产生弯矩的几个可调力，可以精确地补偿反射镜的光学表面畸变。设计了一种动态运动关节，弹簧压缩与螺杆旋转之间的对应关系保证了镜预载荷大小的精确控制。最后，通过现场实验和数值模拟验证了该方法的有效性。该运输镜总成安装设计具有机械结构简单、工作效率高、预紧力控制精确等技术优势。结果表明，优化后的装配设计和安装策略可以将反射镜的总表面畸变控制在350 nm（峰谷）以内。
Abstract. Aiming to minimize the surface distortion of large-aperture laser transport mirrors in high-power laser facilities, an assembly design and mounting method are proposed for the mirror. First, a theoretical model on the mirror surface deformation is established. With a new assembly design, the mirror is fastened on its neutral plane and its optical surface distortion can be precisely compensated through several adjustable forces on the sides, which will generate bending moments on the mirror body. Furthermore, a dynamic kinematic joint is designed, in which a corresponding relationship between spring compression and screw rotation ensures the accurate control of the magnitude of mirror preload. Finally, the performance of the presented method has been validated through field experiments and numerical simulations. This transport mirror assembly and mounting design have obvious technical advantages on simple mechanical structure, high operational efficiency, and precise preload control. The results show that the assembly design and optimized mounting strategy can keep the total surface distortion of the mirror within 350 nm (peak-valley).