Applications of computer-generated holograms for interferometric measurement of large aspheric optics

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

102 Scopus citations

Abstract

Interferometric optical testing using computer-generated holograms (CGH's) has proven to give highly accurate measurements of aspheric surfaces. New applications of CGH interferometry were developed to support the fabrication of the large, steep mirrors required by the next generation ground-based telescopes. A new test to certify null correctors was designed and implemented that uses small CGH's fabricated onto flat surfaces. This test solves the difficult problem of verifying the accuracy of the null correctors that are used for measuring primary mirrors. Several new techniques for hologram fabrication have been explored for this application. A second new use of CGH's was developed for measuring convex secondary mirrors using test plates with holograms fabricated onto concave spherical reference surfaces. This test provides efficient and accurate measurement of large aspheric convex mirrors. A polar coordinate laser writing machine was built for fabricating these patterns onto curved optical surfaces up to 1.8 meters in diameter and as fast as f/1. These powerful new techniques have been implemented and optimized at the Steward Observatory Mirror Laboratory to guide mirror polishing for large telescope projects. They can also be readily applied for measuring small aspheres to high accuracy.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsToshio Kasai
PublisherSociety of Photo-Optical Instrumentation Engineers
Pages258-269
Number of pages12
ISBN (Print)0819419370
StatePublished - Jan 1 1995
EventInternational Conference on Optical Fabrication and Testing - Tokyo, Jpn
Duration: Jun 5 1995Jun 7 1995

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume2576
ISSN (Print)0277-786X

Other

OtherInternational Conference on Optical Fabrication and Testing
CityTokyo, Jpn
Period6/5/956/7/95

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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  • Cite this

    Burge, J. H. (1995). Applications of computer-generated holograms for interferometric measurement of large aspheric optics. In T. Kasai (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (pp. 258-269). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 2576). Society of Photo-Optical Instrumentation Engineers.