The adversarial relationship between optical performance and scratch-dig

Cody B. Kreischer

doi:10.1117/12.870033

9 September 2010 The adversarial relationship between optical performance and scratch-dig

Cody B. Kreischer

Proceedings Volume 7652, International Optical Design Conference 2010; 76521K (2010) https://doi.org/10.1117/12.870033
Event: International Optical Design Conference 2010, 2010, Jackson Hole, WY, United States

Abstract

A key factor in the manufacturing difficulty of a precision optic, and therefore a key cost factor, is the surface quality (scratch-dig) specification. On the other hand, surface quality usually has little or no significant impact on the performance of the finished optical system, but rather is included in tolerancing for cosmetic purposes only. From a manufacturing standpoint, center thickness, radius, irregularity, glass type and cosmetic quality are all inter-related. When more importance is placed on any one of these, there is a tendency for the others to be negatively impacted. This paper makes the case that when surface quality is over-emphasized, not only is it a cost driver but also the average "as built" optical performance of the optical system will be lower because performance based tolerances are more likely to be pushed to their limit.

Citation Download Citation

Cody B. Kreischer "The adversarial relationship between optical performance and scratch-dig", Proc. SPIE 7652, International Optical Design Conference 2010, 76521K (9 September 2010); https://doi.org/10.1117/12.870033

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