Progress in manufacturing the first 8.4 m off-axis segment for the Giant Magellan Telescope

H. M. Martin, J. H. Burge, B. Cuerden, W. B. Davison, J. S. Kingsley, W. C. Kittrell, R. D. Lutz, S. M. Miller, C. Zhao, T. Zobrist

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

11 Scopus citations

Abstract

The first of the 8.4 m off-axis segments for the primary mirror of the Giant Magellan Telescope is being manufactured at the Steward Observatory Mirror Lab. In addition to the manufacture of the segment, this project includes the development of a complete facility to make and measure all seven segments. We have installed a new 28 m test tower and designed a set of measurements to guide the fabrication and qualify the finished segments. The first test, a laser-tracker measurement of the ground surface, is operational. The principal optical test is a full-aperture interferometric test with a null corrector that includes a 3.75 m spherical mirror, a smaller sphere, and a computer-generated hologram. We have also designed a scanning pentaprism test to validate the measurement of low-order aberrations. The first segment has been cast and generated, and is in the process of loose-abrasive grinding.

Original languageEnglish (US)
Title of host publicationAdvanced Optical and Mechanical Technologies in Telescopes and Instrumentation
DOIs
StatePublished - Nov 21 2008
EventAdvanced Optical and Mechanical Technologies in Telescopes and Instrumentation - Marseille, France
Duration: Jun 23 2008Jun 28 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7018
ISSN (Print)0277-786X

Other

OtherAdvanced Optical and Mechanical Technologies in Telescopes and Instrumentation
CountryFrance
CityMarseille
Period6/23/086/28/08

Keywords

  • Active optics
  • Aspheres
  • Optical fabrication
  • Optical testing
  • Telescopes

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Progress in manufacturing the first 8.4 m off-axis segment for the Giant Magellan Telescope'. Together they form a unique fingerprint.

  • Cite this

    Martin, H. M., Burge, J. H., Cuerden, B., Davison, W. B., Kingsley, J. S., Kittrell, W. C., Lutz, R. D., Miller, S. M., Zhao, C., & Zobrist, T. (2008). Progress in manufacturing the first 8.4 m off-axis segment for the Giant Magellan Telescope. In Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation [70180C] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7018). https://doi.org/10.1117/12.789805