Super-smooth optical fabrication controlling high spatial frequency surface irregularity

Javier Del Hoyo, Dae Wook Kim, James H Burge

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations

Abstract

Modern advanced optical systems often require challenging high spatial frequency surface error control during their optical fabrication processes. While the large scale surface figure error can be controlled by directed material removal processes such as small tool figuring, surface finish (<<1mm scales) is controlled with the polishing process. For large aspheric optical systems, surface shape irregularities of a few millimeters in scale may cause serious performance degradation in terms of scattered light background noise and high contrast imaging capability. The conventional surface micro roughness concept in Root Mean Square (RMS) over a very high spatial frequency range (e.g. RMS of 0.5 by 0.5 mm local surface map with 500 by 500 pixels) is not sufficient to describe or specify these surface characteristics. For various experimental polishing conditions, we investigate the process control for high frequency surface errors with periods up to ~2-3mm. The Power Spectral Density of the finished optical surfaces has been measured and analyzed to relate various computer controlled optical surfacing parameters (e.g. polishing interface materials) with the high spatial frequency errors on the surface. The experiment-based optimal polishing conditions and processes producing a super smooth optical surface while controlling surface irregularity at the millimeter range are presented.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume8838
DOIs
Publication statusPublished - 2013
EventOptical Manufacturing and Testing X - San Diego, CA, United States
Duration: Aug 26 2013Aug 27 2013

Other

OtherOptical Manufacturing and Testing X
CountryUnited States
CitySan Diego, CA
Period8/26/138/27/13

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ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Hoyo, J. D., Kim, D. W., & Burge, J. H. (2013). Super-smooth optical fabrication controlling high spatial frequency surface irregularity. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 8838). [88380T] https://doi.org/10.1117/12.2022924