Manufacture of a 1.7 m prototype of the GMT primary mirror segments

H. M. Martin; J. H. Burge; S. M. Miller; B. K. Smith; R. Zehnder; C. Zhao

doi:10.1117/12.672105

Manufacture of a 1.7 m prototype of the GMT primary mirror segments

H. M. Martin, J. H. Burge, S. M. Miller, B. K. Smith, R. Zehnder, C. Zhao

Optical Sciences, College of

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

23 Scopus citations

Abstract

We have nearly completed the manufacture of a 1.7 m off-axis mirror as part of the technology development for the Giant Magellan Telescope. The mirror is an off-axis section of a 5.3 m f/0.73 parent paraboloid, making it roughly a 1:5 model of the outer 8.4 m GMT segment. The 1.7 m mirror will be the primary mirror of the New Solar Telescope at Big Bear Solar Observatory. It has a 2.7 mm peak-to-valley departure from the best-fit sphere, presenting a serious challenge in terms of both polishing and measurement. The mirror was polished with a stressed lap, which bends actively to match the local curvature at each point on the mirror surface, and works for asymmetric mirrors as well as symmetric aspheres. It was measured using a hybrid reflective-diffractive null corrector to compensate for the mirror's asphericity. Both techniques will be applied in scaled-up versions to the GMT segments.

Original language	English (US)
Title of host publication	Optomechanical Technologies for Astronomy
DOIs	https://doi.org/10.1117/12.672105
State	Published - 2006
Event	Optomechanical Technologies for Astronomy - Orlando, FL, United States Duration: May 24 2006 → May 31 2006

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	6273 I
ISSN (Print)	0277-786X

Other

Other	Optomechanical Technologies for Astronomy
Country/Territory	United States
City	Orlando, FL
Period	5/24/06 → 5/31/06

Keywords

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

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10.1117/12.672105

Cite this

Martin, HM, Burge, JH, Miller, SM, Smith, BK, Zehnder, R & Zhao, C 2006, Manufacture of a 1.7 m prototype of the GMT primary mirror segments. in Optomechanical Technologies for Astronomy., 62730G, Proceedings of SPIE - The International Society for Optical Engineering, vol. 6273 I, Optomechanical Technologies for Astronomy, Orlando, FL, United States, 5/24/06. https://doi.org/10.1117/12.672105

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abstract = "We have nearly completed the manufacture of a 1.7 m off-axis mirror as part of the technology development for the Giant Magellan Telescope. The mirror is an off-axis section of a 5.3 m f/0.73 parent paraboloid, making it roughly a 1:5 model of the outer 8.4 m GMT segment. The 1.7 m mirror will be the primary mirror of the New Solar Telescope at Big Bear Solar Observatory. It has a 2.7 mm peak-to-valley departure from the best-fit sphere, presenting a serious challenge in terms of both polishing and measurement. The mirror was polished with a stressed lap, which bends actively to match the local curvature at each point on the mirror surface, and works for asymmetric mirrors as well as symmetric aspheres. It was measured using a hybrid reflective-diffractive null corrector to compensate for the mirror's asphericity. Both techniques will be applied in scaled-up versions to the GMT segments.",

keywords = "Aspheres, Optical fabrication, Optical testing, Telescopes",

author = "Martin, {H. M.} and Burge, {J. H.} and Miller, {S. M.} and Smith, {B. K.} and R. Zehnder and C. Zhao",

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AU - Martin, H. M.

AU - Burge, J. H.

AU - Miller, S. M.

AU - Smith, B. K.

AU - Zehnder, R.

AU - Zhao, C.

PY - 2006

Y1 - 2006

N2 - We have nearly completed the manufacture of a 1.7 m off-axis mirror as part of the technology development for the Giant Magellan Telescope. The mirror is an off-axis section of a 5.3 m f/0.73 parent paraboloid, making it roughly a 1:5 model of the outer 8.4 m GMT segment. The 1.7 m mirror will be the primary mirror of the New Solar Telescope at Big Bear Solar Observatory. It has a 2.7 mm peak-to-valley departure from the best-fit sphere, presenting a serious challenge in terms of both polishing and measurement. The mirror was polished with a stressed lap, which bends actively to match the local curvature at each point on the mirror surface, and works for asymmetric mirrors as well as symmetric aspheres. It was measured using a hybrid reflective-diffractive null corrector to compensate for the mirror's asphericity. Both techniques will be applied in scaled-up versions to the GMT segments.

AB - We have nearly completed the manufacture of a 1.7 m off-axis mirror as part of the technology development for the Giant Magellan Telescope. The mirror is an off-axis section of a 5.3 m f/0.73 parent paraboloid, making it roughly a 1:5 model of the outer 8.4 m GMT segment. The 1.7 m mirror will be the primary mirror of the New Solar Telescope at Big Bear Solar Observatory. It has a 2.7 mm peak-to-valley departure from the best-fit sphere, presenting a serious challenge in terms of both polishing and measurement. The mirror was polished with a stressed lap, which bends actively to match the local curvature at each point on the mirror surface, and works for asymmetric mirrors as well as symmetric aspheres. It was measured using a hybrid reflective-diffractive null corrector to compensate for the mirror's asphericity. Both techniques will be applied in scaled-up versions to the GMT segments.

KW - Aspheres

KW - Optical fabrication

KW - Optical testing

KW - Telescopes

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T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Optomechanical Technologies for Astronomy

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Y2 - 24 May 2006 through 31 May 2006

ER -

Manufacture of a 1.7 m prototype of the GMT primary mirror segments

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Keywords

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