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13 November 2020 High-precision assembly process of large-aperture laser transport mirror in the high-energy laser facility
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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).

© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2020/$28.00 © 2020 SPIE
Dongya Chu, Menjiya Tian, Yongjie Li, Hui Wang, Zheng Zhang, and Tingfen Cao "High-precision assembly process of large-aperture laser transport mirror in the high-energy laser facility," Optical Engineering 59(11), 115101 (13 November 2020).
Received: 12 July 2020; Accepted: 26 October 2020; Published: 13 November 2020

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