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http://dx.doi.org/10.3807/KJOP.2005.16.1.071

A study for null lens design of autostigmatic type and the limitation of measurement accuracy for ultra precision manufacturing of large aspherical surface  

Kim, Kil-Seon (Applied Optics and Electromagnetics, School of Natural Science, Hannam University)
Rim, Cheon-Seog (Applied Optics and Electromagnetics, School of Natural Science, Hannam University)
Publication Information
Korean Journal of Optics and Photonics / v.16, no.1, 2005 , pp. 71-78 More about this Journal
Abstract
A null lens system of autostigmatic type, consisting of two mirrors, is designed for testing a large aspherical mirror. The system is theoretically analyzed to determine the limitation of measurement accuracy according to the manufacturing and alignment errors. We confirmed that irregularity of the null lens surface is the principal factor among tolerances in limiting measurement accuracy. Consequently, we can predict that measurement accuracy will be from 5λ/100 to 4λ/1000 according to the amount of this irregularity. That is, we can present the limitation of possible measurement accuracy with actual alignment and manufacturing errors.
Keywords
autostigmatic; null lens; tolerance analysis; large aspherical mirror;
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