Design and fabrication of CGH for 600mm diameter SiC primary mirror surface figure testing

Zhihai Pang; Zhen Ma; Xuewu Fan; Gangyi Zou

doi:10.1117/12.2243443

27 September 2016 Design and fabrication of CGH for 600mm diameter SiC primary mirror surface figure testing

Zhihai Pang, Zhen Ma, Xuewu Fan, Gangyi Zou

Proceedings Volume 9684, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment; 96842J (2016) https://doi.org/10.1117/12.2243443
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China

Abstract

Computer-generated hologram (CGH) is an effective way to compensate wavefront aberration in null test of aspheric surfaces and freeform surfaces. Our strategies of CGH design for 600mm diameter SiC primary mirror surface figure testing are presented, and an experiment demonstrating the compensation test results of CGH is reported. We design a CGH including two sections on the same substrate in order to align the CGH to the incident wavefront: main section for compensating wavefront in null test, alignment section for adjusting the relative position between CGH and interferometer. In order to isolate different orders of diffraction, we used power carrier to make different orders of diffraction come to focus at different position along the axis to avoid ghost reflections. We measured the 600mm diameter SiC primary mirror using this CGH, and the surface test result is 0.033λ rms.

Citation Download Citation

Zhihai Pang, Zhen Ma, Xuewu Fan, and Gangyi Zou "Design and fabrication of CGH for 600mm diameter SiC primary mirror surface figure testing", Proc. SPIE 9684, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment, 96842J (27 September 2016); https://doi.org/10.1117/12.2243443

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