As-fab elements: design vs. reality

Victor E. Densmore III; Christopher M. Shanor; Isela D. Howlett; Kate Medicus; Tilman Stuhlinger; Kenneth R. Castle

doi:10.1117/12.2324941

19 September 2018 As-fab elements: design vs. reality

Victor E. Densmore III, Christopher M. Shanor, Isela D. Howlett, Kate Medicus, Tilman Stuhlinger, Kenneth R. Castle

Proceedings Volume 10747, Optical System Alignment, Tolerancing, and Verification XII; 107470G (2018) https://doi.org/10.1117/12.2324941
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

In the design of optical assemblies, emphasis is placed on tolerancing the surface irregularity, which is a driving factor in price and manufacturing prices and time during polishing. Quite often, the default irregularity tolerance in modeling software is assumed to be a 50:50 split between astigmatism and 3^rd order spherical aberration (i.e. symmetric zonal errors). In this paper, we reviewed the irregularity of over 1,000 custom fabrication optical surfaces. We looked at the relationship between the spherical and astigmatism aberrations and found generally that a surface will be either astigmatic or spherical, but rarely a mixture of the two. We also looked at the PV and rms of the surfaces and how that compares to the model and the general knowledge. One striking result of our analysis came from a closer analysis of how the optical modeling software package handles ‘power’ errors in the irregularity tolerance. It is possible that there is a mismatch between the model and the optical manufacturer.

Citation Download Citation

Victor E. Densmore III, Christopher M. Shanor, Isela D. Howlett, Kate Medicus, Tilman Stuhlinger, and Kenneth R. Castle "As-fab elements: design vs. reality", Proc. SPIE 10747, Optical System Alignment, Tolerancing, and Verification XII, 107470G (19 September 2018); https://doi.org/10.1117/12.2324941

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