Long focal length aspherical mirror testing with CGH and auxiliary lenses (invited)

doi:10.3788/IRLA20220384

CIOMP OpenIR

	Long focal length aspherical mirror testing with CGH and auxiliary lenses (invited)
	Y. Zhang; F. Li; L. Yan; D. Yan; C. Wang; Y. Zhang; B. Zhang; X. Zhang; M. Cai; J. He and X. Wang
	2022
发表期刊	Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering
ISSN	10072276
卷号	51 期号:9
摘要	At present, the radius of curvature of the primary mirror in some large-aperture optical telescopes has reached the order of tens of meters. If the surface of the mirror is tested simply by CGH, the length of the testing optical path is not lower than the length of its radius of curvature. Due to factors such as site size and ambient airflow disturbance, it is difficult to achieve high-precision measurement of the mirror surface under these conditions. In order to solve the problem of high-precision surface testing of large-aperture long focal length optical mirror, a hybrid compensation method is proposed. This hybrid compensation method combines CGH and auxiliary lenses to effectively shorten the length of the testing optical path, and can realize null testing of aspherical mirrors. In the optical path design, it is necessary to effectively optimize the optical design parameters of the hybrid compensation optical path and the separation of the CGH diffraction order. At the same time, the optical path length should be less than the radius of curvature of the aspherical mirror to achieve the purpose of shortening the length of the testing optical path. By testing the EELT main mirror, the simulation test shows that the testing path length of the method can be shortened to less than 1/8 of the length of the radius of curvature of the surface. Designing testing accuracy is better than that of RMS /100 (=632.8 nm). The above simulation results show that this method can not only realize the shortening the length of the testing optical path, but also achieve the high-precision surface testing of the aspherical mirror. 2022 Chinese Society of Astronautics. All rights reserved.
DOI	10.3788/IRLA20220384
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收录类别	ei
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/66816
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Y. Zhang,F. Li,L. Yan,et al. Long focal length aspherical mirror testing with CGH and auxiliary lenses (invited)[J]. Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering,2022,51(9).
APA	Y. Zhang.,F. Li.,L. Yan.,D. Yan.,C. Wang.,...&J. He and X. Wang.(2022).Long focal length aspherical mirror testing with CGH and auxiliary lenses (invited).Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering,51(9).
MLA	Y. Zhang,et al."Long focal length aspherical mirror testing with CGH and auxiliary lenses (invited)".Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering 51.9(2022).

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