Parametric Circular Aperture Segmentation Formalism

Jeong Yeol Han, Sukmock Lee, Daewook Kim

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


To minimize the artifacts in Point Spread Functions (PSFs) of space telescopes such as the 6 major spikes shown in the star image observed by the James Webb Space Telescope, which are caused by the primary mirror outer boundary and the gaps between segments, an alternative method to segmentize large circular telescope mirror is proposed. From the fact that the strong spikes are due to the parallel-ness of all linear boundary edges and gaps in the current hexagonal segmentation approach, the proposed segmentation methodology minimizes such parallel-ness. The proposed method comes with a set of formulas that can assist the design process including the systematic calculation of number of segments and the size of each segment to cover the entire mirror pupil area. Some example PSFs of a few possible segmented mirrors with the proposed formalism will be presented.

Original languageEnglish (US)
Title of host publicationOptical Manufacturing and Testing XIV
EditorsDaewook Kim, Heejoo Choi, Heidi Ottevaere, Rolf Rascher
ISBN (Electronic)9781510654266
StatePublished - 2022
EventOptical Manufacturing and Testing XIV 2022 - San Diego, United States
Duration: Aug 22 2022Aug 24 2022

Publication series

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


ConferenceOptical Manufacturing and Testing XIV 2022
Country/TerritoryUnited States
CitySan Diego


  • Point Spread Function
  • segmentation
  • segmented mirror
  • telescope mirrors

ASJC Scopus subject areas

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


Dive into the research topics of 'Parametric Circular Aperture Segmentation Formalism'. Together they form a unique fingerprint.

Cite this