Study on edge-trimming experiment of a reflective mirror

Huijun Wang; Jiyou Zhang; Jianhai Yu; Yuming Zhou; Yonggang Wang; Wen Guo

doi:10.1117/12.2505041

11 January 2019 Study on edge-trimming experiment of a reflective mirror

Huijun Wang, Jiyou Zhang, Jianhai Yu, Yuming Zhou, Yonggang Wang, Wen Guo

Proceedings Volume 10837, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 1083711 (2019) https://doi.org/10.1117/12.2505041
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

Edge-trimming experiment of a reflective mirror is carried on in the paper to study the influence of edge-trimming on the surface figure of a reflective mirror. First, the influences of both self-gravity and the supporting method in measuring on the surface figure of the same mirror before and after edge-trimming are simulated. The simulation results show that both self-gravity and the supporting method in measuring have little influence on the surface figure. Second, the real surface figure of the mirror before edge-trimming is calibrated. Third, edge-trimming experiment of the mirror is carried on the ultrasonic grinding machine. Forth, the real surface figure of the mirror with the same effective aperture after edge-trimming is calibrated. The measuring results show that the surface figure of the mirror after edge-trimming is changed greatly in comparison of that of the mirror before edge-trimming: the surface figure of the mirror before edge-trimming is that the root-mean-square value (RMS value) is about λ/40 (λ=632.8nm), while the RMS value of the surface figure of the mirror after edge-trimming is about λ/15. At last, the mirror is polished again. The final RMS value of the surface figure of the mirror is about λ/40. The experimental results show that edge-trimming can bring stress to the mirror. Therefore, edge-trimming influences the surface figure of the mirror considerably. The consequent polishing experiment can erase the influence. The experiment shows that edge-trimming can be carried on with the reflective mirror with lower surface precision. The whole experiment will provide some helpful reference on the choice of edge-trimming occasion of the reflective mirror if it is necessary.

Citation Download Citation

Huijun Wang, Jiyou Zhang, Jianhai Yu, Yuming Zhou, Yonggang Wang, and Wen Guo "Study on edge-trimming experiment of a reflective mirror", Proc. SPIE 10837, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 1083711 (11 January 2019); https://doi.org/10.1117/12.2505041

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