Certification of null correctors for primary mirrors

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

28 Scopus citations

Abstract

An optical test for measuring null correctors has been developed that uses a rotationally symmetric computer-generated hologram (CGH) to synthesize the wavefront that would be reflected by a perfect primary mirror. The test of a null lens is performed by measuring the CGH through the null corrector. Agreement between the null lens and the CGH indicates a high probability that both the null lens and the CGH are correct. This paper presents results that confirm the ease and accuracy of the test. Three null correctors for 3.5-m primary mirrors were measured at the Steward Observatory Mirror Lab using this test. Two of the null correctors were shown to have the correct conic constants within the measurement uncertainty of ± 78 ppm. The test of the third null corrector was limited by gross flaws in the holograms caused by a fabrication error. A proposed solution to the fabrication problem is presented.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsVictor J. Doherty
PublisherPubl by Society of Photo-Optical Instrumentation Engineers
Pages248-259
Number of pages12
ISBN (Print)0819412430
StatePublished - Dec 1 1994
EventAdvanced Optical Manufacturing and Testing IV - San Diego, CA, USA
Duration: Jul 15 1993Jul 16 1993

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume1994
ISSN (Print)0277-786X

Other

OtherAdvanced Optical Manufacturing and Testing IV
CitySan Diego, CA, USA
Period7/15/937/16/93

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. (1994). Certification of null correctors for primary mirrors. In V. J. Doherty (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (pp. 248-259). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 1994). Publ by Society of Photo-Optical Instrumentation Engineers.