Final acceptance testing of the LSST monolithic primary/tertiary mirror

Michael T. Tuell; James H. Burge; Brian Cuerden; William Gressler; Hubert M. Martin; Steven C. West; Chunyu Zhao

doi:10.1117/12.2057076

Final acceptance testing of the LSST monolithic primary/tertiary mirror

Michael T. Tuell, James H. Burge, Brian Cuerden, William Gressler, Hubert M. Martin, Steven C. West, Chunyu Zhao

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

10 Scopus citations

Abstract

The Large Synoptic Survey Telescope (LSST) is a three-mirror wide-field survey telescope with the primary and tertiary mirrors on one monolithic substrate¹. This substrate is made of Ohara E6 borosilicate glass in a honeycomb sandwich, spin cast at the Steward Observatory Mirror Lab at The University of Arizona². Each surface is aspheric, with the specification in terms of conic constant error, maximum active bending forces and finally a structure function specification on the residual errors³. There are high-order deformation terms, but with no tolerance, any error is considered as a surface error and is included in the structure function. The radii of curvature are very different, requiring two independent test stations, each with instantaneous phase-shifting interferometers with null correctors. The primary null corrector is a standard two-element Offner null lens. The tertiary null corrector is a phase-etched computer-generated hologram (CGH). This paper details the two optical systems and their tolerances, showing that the uncertainty in measuring the figure is a small fraction of the structure function specification. Additional metrology includes the radii of curvature, optical axis locations, and relative surface tilts. The methods for measuring these will also be described along with their tolerances.

Original language	English (US)
Title of host publication	Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Editors	Colin R. Cunningham, Ramon Navarro, Allison A. Barto
Publisher	SPIE
ISBN (Electronic)	9780819496195
DOIs	https://doi.org/10.1117/12.2057076
State	Published - 2014
Externally published	Yes
Event	Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation - Montreal, Canada Duration: Jun 23 2014 → Jun 27 2014

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	9151
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Other

Other	Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Country/Territory	Canada
City	Montreal
Period	6/23/14 → 6/27/14

Keywords

Active optics
Asphere
Computer-generated hologram (CGH)
Force and temperature compensation
Interferometry
Measurement uncertainty
Null corrector
Structure function

ASJC Scopus subject areas

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

Access to Document

10.1117/12.2057076

Cite this

Tuell, M. T., Burge, J. H., Cuerden, B., Gressler, W., Martin, H. M., West, S. C., & Zhao, C. (2014). Final acceptance testing of the LSST monolithic primary/tertiary mirror. In C. R. Cunningham, R. Navarro, & A. A. Barto (Eds.), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation Article 91510W (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9151). SPIE. https://doi.org/10.1117/12.2057076

Final acceptance testing of the LSST monolithic primary/tertiary mirror. / Tuell, Michael T.; Burge, James H.; Cuerden, Brian et al.
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation. ed. / Colin R. Cunningham; Ramon Navarro; Allison A. Barto. SPIE, 2014. 91510W (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9151).

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

Tuell, MT, Burge, JH, Cuerden, B, Gressler, W, Martin, HM, West, SC & Zhao, C 2014, Final acceptance testing of the LSST monolithic primary/tertiary mirror. in CR Cunningham, R Navarro & AA Barto (eds), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation., 91510W, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9151, SPIE, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, Montreal, Canada, 6/23/14. https://doi.org/10.1117/12.2057076

Tuell MT, Burge JH, Cuerden B, Gressler W, Martin HM, West SC et al. Final acceptance testing of the LSST monolithic primary/tertiary mirror. In Cunningham CR, Navarro R, Barto AA, editors, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation. SPIE. 2014. 91510W. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2057076

Tuell, Michael T. ; Burge, James H. ; Cuerden, Brian et al. / Final acceptance testing of the LSST monolithic primary/tertiary mirror. Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation. editor / Colin R. Cunningham ; Ramon Navarro ; Allison A. Barto. SPIE, 2014. (Proceedings of SPIE - The International Society for Optical Engineering).

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abstract = "The Large Synoptic Survey Telescope (LSST) is a three-mirror wide-field survey telescope with the primary and tertiary mirrors on one monolithic substrate1. This substrate is made of Ohara E6 borosilicate glass in a honeycomb sandwich, spin cast at the Steward Observatory Mirror Lab at The University of Arizona2. Each surface is aspheric, with the specification in terms of conic constant error, maximum active bending forces and finally a structure function specification on the residual errors3. There are high-order deformation terms, but with no tolerance, any error is considered as a surface error and is included in the structure function. The radii of curvature are very different, requiring two independent test stations, each with instantaneous phase-shifting interferometers with null correctors. The primary null corrector is a standard two-element Offner null lens. The tertiary null corrector is a phase-etched computer-generated hologram (CGH). This paper details the two optical systems and their tolerances, showing that the uncertainty in measuring the figure is a small fraction of the structure function specification. Additional metrology includes the radii of curvature, optical axis locations, and relative surface tilts. The methods for measuring these will also be described along with their tolerances.",

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AB - The Large Synoptic Survey Telescope (LSST) is a three-mirror wide-field survey telescope with the primary and tertiary mirrors on one monolithic substrate1. This substrate is made of Ohara E6 borosilicate glass in a honeycomb sandwich, spin cast at the Steward Observatory Mirror Lab at The University of Arizona2. Each surface is aspheric, with the specification in terms of conic constant error, maximum active bending forces and finally a structure function specification on the residual errors3. There are high-order deformation terms, but with no tolerance, any error is considered as a surface error and is included in the structure function. The radii of curvature are very different, requiring two independent test stations, each with instantaneous phase-shifting interferometers with null correctors. The primary null corrector is a standard two-element Offner null lens. The tertiary null corrector is a phase-etched computer-generated hologram (CGH). This paper details the two optical systems and their tolerances, showing that the uncertainty in measuring the figure is a small fraction of the structure function specification. Additional metrology includes the radii of curvature, optical axis locations, and relative surface tilts. The methods for measuring these will also be described along with their tolerances.

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Final acceptance testing of the LSST monolithic primary/tertiary mirror

Abstract

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Keywords

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