Specifications: figure and finish are not enough

Robert E. Parks

doi:10.1117/12.798223

3 September 2008 Specifications: figure and finish are not enough

Robert E. Parks

Proceedings Volume 7071, An Optical Believe It or Not: Key Lessons Learned; 70710B (2008) https://doi.org/10.1117/12.798223
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

Abstract

Several examples are given of optics apparently specified only by figure and finish. Although these optics met the specifications they did not produce good images. The presumed reason for the poor performance was the lack of a specification for mid-spatial frequency roughness. We show that a reasonable specification can be applied using the concept of a structure function, a mathematically simple function easily calculated from interferometric phase data at each pixel. An example wavefront is used to show how the specification can be developed from typical figure and finish specifications and include information about roughness in the mid-spatial frequency region.

Citation Download Citation

Robert E. Parks "Specifications: figure and finish are not enough", Proc. SPIE 7071, An Optical Believe It or Not: Key Lessons Learned, 70710B (3 September 2008); https://doi.org/10.1117/12.798223

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