Polishing of a 6.5 m f/1.25 mirror for the first Magellan telescope

H. M. Martin; R. G. Allen; J. H. Burge; L. R. Dettmann; D. A. Ketelsen; W. C. Kittrell; S. M. Miller

Polishing of a 6.5 m f/1.25 mirror for the first Magellan telescope

H. M. Martin, R. G. Allen, J. H. Burge, L. R. Dettmann, D. A. Ketelsen, W. C. Kittrell, S. M. Miller

Optical Sciences, College of

Research output: Contribution to journal › Conference article › peer-review

13 Scopus citations

Abstract

We describe the optical fabrication and testing of the 6.5 m f/1.25 primary mirror for the first Magellan telescope. Figuring was performed with a 1.2 m stressed lap, which bends under active control to match the local curvature of the optical surface, and a variety of small passive tools. The figure was measured with IR and visible interferometers, using refractive null correctors to compensate 810 microns of aspheric departure. After subtraction of Seidel astigmatism and spherical aberration, the finished mirror is accurate to 14 nm rms surface error, and has an encircled energy of 80% in 0.06″ diameter at 500 nm.

Original language	English (US)
Pages (from-to)	47-55
Number of pages	9
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	3739
State	Published - 1999
Event	Proceedings of the 1999 Optical Fabrication and Testing - Berlin, Ger Duration: May 26 1999 → May 28 1999

ASJC Scopus subject areas

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

Cite this

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title = "Polishing of a 6.5 m f/1.25 mirror for the first Magellan telescope",

abstract = "We describe the optical fabrication and testing of the 6.5 m f/1.25 primary mirror for the first Magellan telescope. Figuring was performed with a 1.2 m stressed lap, which bends under active control to match the local curvature of the optical surface, and a variety of small passive tools. The figure was measured with IR and visible interferometers, using refractive null correctors to compensate 810 microns of aspheric departure. After subtraction of Seidel astigmatism and spherical aberration, the finished mirror is accurate to 14 nm rms surface error, and has an encircled energy of 80% in 0.06″ diameter at 500 nm.",

author = "Martin, {H. M.} and Allen, {R. G.} and Burge, {J. H.} and Dettmann, {L. R.} and Ketelsen, {D. A.} and Kittrell, {W. C.} and Miller, {S. M.}",

year = "1999",

language = "English (US)",

volume = "3739",

pages = "47--55",

journal = "Proceedings of SPIE - The International Society for Optical Engineering",

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publisher = "SPIE",

note = "Proceedings of the 1999 Optical Fabrication and Testing ; Conference date: 26-05-1999 Through 28-05-1999",

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TY - JOUR

T1 - Polishing of a 6.5 m f/1.25 mirror for the first Magellan telescope

AU - Martin, H. M.

AU - Allen, R. G.

AU - Burge, J. H.

AU - Dettmann, L. R.

AU - Ketelsen, D. A.

AU - Kittrell, W. C.

AU - Miller, S. M.

PY - 1999

Y1 - 1999

N2 - We describe the optical fabrication and testing of the 6.5 m f/1.25 primary mirror for the first Magellan telescope. Figuring was performed with a 1.2 m stressed lap, which bends under active control to match the local curvature of the optical surface, and a variety of small passive tools. The figure was measured with IR and visible interferometers, using refractive null correctors to compensate 810 microns of aspheric departure. After subtraction of Seidel astigmatism and spherical aberration, the finished mirror is accurate to 14 nm rms surface error, and has an encircled energy of 80% in 0.06″ diameter at 500 nm.

AB - We describe the optical fabrication and testing of the 6.5 m f/1.25 primary mirror for the first Magellan telescope. Figuring was performed with a 1.2 m stressed lap, which bends under active control to match the local curvature of the optical surface, and a variety of small passive tools. The figure was measured with IR and visible interferometers, using refractive null correctors to compensate 810 microns of aspheric departure. After subtraction of Seidel astigmatism and spherical aberration, the finished mirror is accurate to 14 nm rms surface error, and has an encircled energy of 80% in 0.06″ diameter at 500 nm.

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M3 - Conference article

AN - SCOPUS:0032646744

SN - 0277-786X

VL - 3739

SP - 47

EP - 55

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

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

T2 - Proceedings of the 1999 Optical Fabrication and Testing

Y2 - 26 May 1999 through 28 May 1999

ER -

Polishing of a 6.5 m f/1.25 mirror for the first Magellan telescope

Abstract

ASJC Scopus subject areas

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