Improvements in the scanning long-wave optical test system

Hyemin Yoo, Greg A. Smith, Chang Jin Oh, Andrew E. Lowman, Matthew Dubin

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

7 Scopus citations


The Scanning Long-wave Optical Test System (SLOTS) is a slope measuring deflectometry system that provides accurate measurements on ground surfaces. As it uses a thermal source, we can measure an optic during the grinding phase which allows us to correct figure errors when material removal is much faster. We have made improvements in SLOTS, such as the step-And-stare method, the ceramic rod, and the Gaussian fitting processing software, so that this system supports higher accuracy and resolution. As a result, SLOTS is an optical testing system that covers a huge portion of the fabrication process from the grinding to the figuring. It is a complementary solution for other metrology systems such as the laser tracker, SCOTS, and null interferometry. SLOTS can reduce the manufacturing time by producing ground aspheres that have low errors of the surface figure when polishing begins.

Original languageEnglish (US)
Title of host publicationOptical Manufacturing and Testing XII
EditorsRay Williamson, Dae Wook Kim, Rolf Rascher
ISBN (Electronic)9781510620551
StatePublished - 2018
EventOptical Manufacturing and Testing XII 2018 - San Diego, United States
Duration: Aug 20 2018Aug 22 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherOptical Manufacturing and Testing XII 2018
Country/TerritoryUnited States
CitySan Diego


  • Aspheric mirror
  • Deflectometry
  • Ground surface
  • optical testing
  • slope measurement

ASJC Scopus subject areas

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


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