Measurement of a 2-meter flat using a pentaprism scanning system

Proteep C.V. Mallik, Chunyu Zhao, James H. Burge

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Precise manufacturing of optical flats requires precise characterization of the surface. A scanning pentaprism system is ideal for use as an absolute and precise test for an optical flat. Such a system was built and used to test a 2-m diameter flat mirror. This system uses light from an autocollimator that is reflected from two pentaprisms to project reference beams of light onto the flat mirror. The light reflected from the mirror back through the pentaprisms provides information on low order optical aberrations in the flat mirror. We report results of the test on a 2-m flat, characterizing the errors and their sources. There is enormous potential for our system to be used to test larger flats and even curved surfaces, made of either a glass or a liquid.

Original languageEnglish (US)
Article number023602
JournalOptical Engineering
Issue number2
StatePublished - Feb 2007


  • Difference measurements
  • Flat mirror
  • Optical scanning
  • Optical testing
  • Pentaprism
  • Slope measurements

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)


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