21 August 2009 Non-null interferometric aspheric testing with partial null lens and reverse optimization
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Abstract
With respect to null test, non-null test is more flexible and can provide fast, general test with acceptable accuracy. A non-null interferometric aspheric testing system, which employs partial null lens and reverse optimization reconstruction, is proposed. The partial null lens compensates most of the longitude aberration of the aspheric under test and keeps the slope of the non-null wavefront within the resolution of the detector. The reverse optimization reconstruction procedure reduces the retrace error of the non-null test and reconstructs the figure of the test aspheric. The characteristic, design process of the partial null lens and especially the implement of the reverse optimization reconstruction are discussed in detail. Computer simulation shows the reverse optimization reconstruction procedure can reconstruct the aspheric figure error with an accuracy better than 1/200wave within 5 mins. The error analysis is also considered and some conclusions are given. This research is of great importance for general aspheric surfacing and testing.
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Dong Liu, Yongying Yang, Yongjie Luo, Chao Tian, Yibing Shen, Yongmo Zhuo, "Non-null interferometric aspheric testing with partial null lens and reverse optimization", Proc. SPIE 7426, Optical Manufacturing and Testing VIII, 74260M (21 August 2009); doi: 10.1117/12.824534; https://doi.org/10.1117/12.824534
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