Replication as an alternative approach for large segmented telescopes

Melville P. Ulmer*, Robert I. Altkorn, E. D. Kibblewhite, Steven Varlese

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations


The next generation of optical/IR telescopes will require large numbers of co-phased segmented mirrors. Therefore, some form of replication technology is desirable to reduce costs. Electroforming has the advantage that it is a commercially developed technology for replication, and the technology has been widely used for making X-ray mirrors (e.g. XMM-Newton). Composite materials are appealing, since a great deal of development work as been done with composites as well. There are 3 areas that need to be addressed: replication with minimal stress so as to produce a high quality figure; attachment of support of the mirror segment so as to maintain the figure quality; and, thermal control requirements. Here we present a discussion of the requirements that lead us to select replication as the fabrication technology and the advantages of replication. We report on our first results of making a concave mirror and testing support methods of flats.

Original languageEnglish (US)
Pages (from-to)786-794
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue number2
StatePublished - 2002
EventLarge Ground-based Telescopes - Waikoloa, HI, United States
Duration: Aug 22 2002Aug 26 2002


  • Composites
  • Electroforming
  • Optics
  • Segmented Telescopes

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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