Fizeau interferometer with spherical reference and CGH correction for measuring large convex aspheres

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

16 Citations (Scopus)

Abstract

Large, convex surfaces, such as secondary mirrors, have presented challenging metrology problems for many years. Over the years, new metrology approaches have been developed to keep pace with the ever changing definition of "large". The latest class of large secondary mirrors requires a new approach that is practical, scalable and can produce low uncertainty measurements. This paper presents a new configuration that uses a computer generated hologram based Fizeau interferometer to make sub-aperture measurements on large secondary mirrors. One of the key features of this system is that all of the surfaces used in the interferometer are spherical. Another key element is the ability to perform simultaneous phase shift interferometry which reduces sensitivity to vibration. An example system that is capable of measuring the Large Synoptic Survey Telescope secondary mirror is presented along with a sensitivity analysis.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume7426
DOIs
StatePublished - 2009
EventOptical Manufacturing and Testing VIII - San Diego, CA, United States
Duration: Aug 4 2009Aug 5 2009

Other

OtherOptical Manufacturing and Testing VIII
CountryUnited States
CitySan Diego, CA
Period8/4/098/5/09

Fingerprint

Fizeau Interferometer
Asphere
aspheric optics
Interferometers
Mirror
interferometers
mirrors
Metrology
metrology
Convex Surface
Measurement Uncertainty
Hologram
Holograms
sensitivity analysis
Interferometry
Phase Shift
Phase shift
Telescopes
Interferometer
Sensitivity analysis

Keywords

  • Aspheres
  • Computer generated holograms
  • Interferometry
  • Optical testing

ASJC Scopus subject areas

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

Cite this

Fizeau interferometer with spherical reference and CGH correction for measuring large convex aspheres. / Dubin, Matthew B; Su, Peng; Burge, James H.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7426 2009. 74260S.

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

Dubin, MB, Su, P & Burge, JH 2009, Fizeau interferometer with spherical reference and CGH correction for measuring large convex aspheres. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 7426, 74260S, Optical Manufacturing and Testing VIII, San Diego, CA, United States, 8/4/09. https://doi.org/10.1117/12.829053
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