Sub-Nyquist interferometry: Implementation and measurement capability

John E. Greivenkamp, Andrew E. Lowman, Russell J. Palum

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Sub-Nyquist interferometry (SNI) provides a method for measuring wavefronts with large departures from a reference sphere, such as those encountered when testing steep aspheric surfaces. SNI allows wavefronts with several hundred waves of departure to be recorded and analyzed. The theory of SNI is reviewed, its experimental implementation described, and limitations in the hardware and potential improvements are discussed. The importance of calibrating the interferometer for non-null testing is demonstrated.

Original languageEnglish (US)
Article number09016
Pages (from-to)2962-2969
Number of pages8
JournalOptical Engineering
Issue number10
StatePublished - Oct 1996


  • Aspheres
  • Interferometry
  • Metrology
  • Optical testing
  • Phase-shifting interferometry

ASJC Scopus subject areas

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


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