Manufacturing of the 1070mm F/1.5 ellipsoid mirror

Peiji Guo; Jingchi Yu; Yaoming Zhang; Gufeng Qiu

doi:10.1117/12.830818

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20 May 2009 Manufacturing of the 1070mm F/1.5 ellipsoid mirror

Peiji Guo, Jingchi Yu, Yaoming Zhang, Gufeng Qiu

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Proceedings Volume 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 728210 (2009) https://doi.org/10.1117/12.830818
Event: AOMATT 2008 - 4th International Symposium on Advanced Optical Manufacturing, 2008, Chengdu, Chengdu, China

Abstract

The manufacturing procedure of a φ1070mm in diameter F/1.5 ellipsoid mirror is introduced in detail. For testing the rough-ground surface, guiding shaping and fine grinding, a three dimension X-θ-Z profilometer is developed, the instrument measures surface profiles with 1μm accuracy and the biggest mirror being tested is φ1200mm in diameter. During polishing and fine figuring, we chose null test by null corrector with point source at infinity, the designed null corrector includes two piece of lenses and the designed residual wave front aberration is less than 0.008λ(λ=0.6328μm)PV. For avoiding the influence of gravity deformation during polishing and testing, a kind of support system with multipoint unequal support force is developed by applying FEA-based optimization. The mirror was finally figured to the shape accuracy of 0.016λRMS.

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Peiji Guo, Jingchi Yu, Yaoming Zhang, and Gufeng Qiu "Manufacturing of the 1070mm F/1.5 ellipsoid mirror", Proc. SPIE 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 728210 (20 May 2009); https://doi.org/10.1117/12.830818

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