Fabrication and measured quality of the MMT primary mirror

H. M. Martin; R. G. Allen; J. R.P. Angel; J. H. Burge; W. B. Davison; S. T. DeRigne; L. R. Dettmann; D. A. Ketelsen; W. C. Kittrell; S. M. Miller; P. A. Strittmatter; S. C. West

doi:10.1117/12.319255

Fabrication and measured quality of the MMT primary mirror

H. M. Martin, R. G. Allen, J. R.P. Angel, J. H. Burge, W. B. Davison, S. T. DeRigne, L. R. Dettmann, D. A. Ketelsen, W. C. Kittrell, S. M. Miller, P. A. Strittmatter, S. C. West

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

15 Scopus citations

Abstract

The primary mirror for the Multiple Mirror Telescope Conversion is the first 6.5 m honeycomb sandwich mirror cast and polished by the Steward Observatory Mirror Lab. We describe the optical fabrication and testing of the f/1.25 paraboloid, and present the final measurements of figure accuracy and inferred image quality. 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 mirror was pressurized to compensate for polishing loads and thereby eliminate print-through of the honeycomb structure. The net results is a smoother surface on scales of 5-20 cm than has been achieved on previous honeycomb sandwich mirrors. The figure was measured with IR and visible interferometers, using refractive null correctors to compensate 810 microns of aspheric departure. The final measurements were used to calculate synthetic stellar images in a variety of seeing conditions.

Original language	English (US)
Pages (from-to)	194-204
Number of pages	11
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	3352
DOIs	https://doi.org/10.1117/12.319255
State	Published - 1998
Event	Advanced Technology Optical/IR Telescopes VI - Kona, HI, United States Duration: Mar 23 1998 → Mar 25 1998

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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10.1117/12.319255

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Martin, H. M., Allen, R. G., Angel, J. R. P., Burge, J. H., Davison, W. B., DeRigne, S. T., Dettmann, L. R., Ketelsen, D. A., Kittrell, W. C., Miller, S. M., Strittmatter, P. A., & West, S. C. (1998). Fabrication and measured quality of the MMT primary mirror. Proceedings of SPIE - The International Society for Optical Engineering, 3352, 194-204. https://doi.org/10.1117/12.319255

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title = "Fabrication and measured quality of the MMT primary mirror",

abstract = "The primary mirror for the Multiple Mirror Telescope Conversion is the first 6.5 m honeycomb sandwich mirror cast and polished by the Steward Observatory Mirror Lab. We describe the optical fabrication and testing of the f/1.25 paraboloid, and present the final measurements of figure accuracy and inferred image quality. 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 mirror was pressurized to compensate for polishing loads and thereby eliminate print-through of the honeycomb structure. The net results is a smoother surface on scales of 5-20 cm than has been achieved on previous honeycomb sandwich mirrors. The figure was measured with IR and visible interferometers, using refractive null correctors to compensate 810 microns of aspheric departure. The final measurements were used to calculate synthetic stellar images in a variety of seeing conditions.",

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

author = "Martin, {H. M.} and Allen, {R. G.} and Angel, {J. R.P.} and Burge, {J. H.} and Davison, {W. B.} and DeRigne, {S. T.} and Dettmann, {L. R.} and Ketelsen, {D. A.} and Kittrell, {W. C.} and Miller, {S. M.} and Strittmatter, {P. A.} and West, {S. C.}",

year = "1998",

doi = "10.1117/12.319255",

language = "English (US)",

volume = "3352",

pages = "194--204",

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

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note = "Advanced Technology Optical/IR Telescopes VI ; Conference date: 23-03-1998 Through 25-03-1998",

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TY - JOUR

T1 - Fabrication and measured quality of the MMT primary mirror

AU - Martin, H. M.

AU - Allen, R. G.

AU - Angel, J. R.P.

AU - Burge, J. H.

AU - Davison, W. B.

AU - DeRigne, S. T.

AU - Dettmann, L. R.

AU - Ketelsen, D. A.

AU - Kittrell, W. C.

AU - Miller, S. M.

AU - Strittmatter, P. A.

AU - West, S. C.

PY - 1998

Y1 - 1998

N2 - The primary mirror for the Multiple Mirror Telescope Conversion is the first 6.5 m honeycomb sandwich mirror cast and polished by the Steward Observatory Mirror Lab. We describe the optical fabrication and testing of the f/1.25 paraboloid, and present the final measurements of figure accuracy and inferred image quality. 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 mirror was pressurized to compensate for polishing loads and thereby eliminate print-through of the honeycomb structure. The net results is a smoother surface on scales of 5-20 cm than has been achieved on previous honeycomb sandwich mirrors. The figure was measured with IR and visible interferometers, using refractive null correctors to compensate 810 microns of aspheric departure. The final measurements were used to calculate synthetic stellar images in a variety of seeing conditions.

AB - The primary mirror for the Multiple Mirror Telescope Conversion is the first 6.5 m honeycomb sandwich mirror cast and polished by the Steward Observatory Mirror Lab. We describe the optical fabrication and testing of the f/1.25 paraboloid, and present the final measurements of figure accuracy and inferred image quality. 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 mirror was pressurized to compensate for polishing loads and thereby eliminate print-through of the honeycomb structure. The net results is a smoother surface on scales of 5-20 cm than has been achieved on previous honeycomb sandwich mirrors. The figure was measured with IR and visible interferometers, using refractive null correctors to compensate 810 microns of aspheric departure. The final measurements were used to calculate synthetic stellar images in a variety of seeing conditions.

KW - Aspheres

KW - Optical fabrication

KW - Optical testing

KW - Telescopes

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M3 - Conference article

AN - SCOPUS:0002690296

SN - 0277-786X

VL - 3352

SP - 194

EP - 204

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

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

T2 - Advanced Technology Optical/IR Telescopes VI

Y2 - 23 March 1998 through 25 March 1998

ER -

Fabrication and measured quality of the MMT primary mirror

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Keywords

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