Optimized method for manufacturing large aspheric surfaces

Xusheng Zhou; Shengyi Li; Yifan Dai; Xuhui Xie

doi:10.1117/12.782931

21 November 2007 Optimized method for manufacturing large aspheric surfaces

Xusheng Zhou, Shengyi Li, Yifan Dai, Xuhui Xie

Proceedings Volume 6721, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 67210G (2007) https://doi.org/10.1117/12.782931
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

Aspheric optics are being used more and more widely in modern optical systems, due to their ability of correcting aberrations, enhancing image quality, enlarging the field of view and extending the range of effect, while reducing the weight and volume of the system. With optical technology development, we have more pressing requirement to large-aperture and high-precision aspheric surfaces. The original computer controlled optical surfacing (CCOS) technique cannot meet the challenge of precision and machining efficiency. This problem has been thought highly of by researchers. Aiming at the problem of original polishing process, an optimized method for manufacturing large aspheric surfaces is put forward. Subsurface damage (SSD), full aperture errors and full band of frequency errors are all in control of this method. Lesser SSD depth can be gained by using little hardness tool and small abrasive grains in grinding process. For full aperture errors control, edge effects can be controlled by using smaller tools and amendment model with material removal function. For full band of frequency errors control, low frequency errors can be corrected with the optimized material removal function, while medium-high frequency errors by using uniform removing principle. With this optimized method, the accuracy of a K9 glass paraboloid mirror can reach rms 0.055 waves (where a wave is 0.6328μm) in a short time. The results show that the optimized method can guide large aspheric surface manufacturing effectively.

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Xusheng Zhou, Shengyi Li, Yifan Dai, and Xuhui Xie "Optimized method for manufacturing large aspheric surfaces", Proc. SPIE 6721, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 67210G (21 November 2007); https://doi.org/10.1117/12.782931

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KEYWORDS

Polishing

Surface finishing

Aspheric lenses

Manufacturing

Abrasives

Mirrors

Iron

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