The adaptive optics beam steering mirror for the GMT Integral-Field Spectrograph, GMTIFS

R. Sharp; R. Boz; J. Hart; G. Bloxham; D. Bundy; J. Davis; P. J. McGregor; J. Nielson; C. Vest; P. J. Young

doi:10.1117/12.2054835

The adaptive optics beam steering mirror for the GMT Integral-Field Spectrograph, GMTIFS

R. Sharp^*, R. Boz, J. Hart, G. Bloxham, D. Bundy, J. Davis, P. J. McGregor, J. Nielson, C. Vest, P. J. Young

^*Corresponding author for this work

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

4 Citations (Scopus)

Abstract

To achieve the high adaptive optics sky coverage necessary to allow the GMT Integral-Field Spectrograph to access key scientific targets, the on-instrument adaptive-optics wavefront-sensing system must patrol the full 180 arcsecond diameter guide field passed to the instrument. Starlight must be held stationary on the wavefront sensor (accounting for flexure, differential refraction and non-sidereal tracking rates) to ∼ 1 milliarcsecond to provide the stable position reference signal for deep AO observations and avoid introducing image blur. Hence a tight tolerance of 1/180,000 is placed on the positioning and encoding accuracy for the cryogenic On-Instrument Wave-Front Sensor feed. GMTIFS will achieve this requirement using a beam-steering mirror system as an optical relay for starlight from across the accessible guide field. The system avoids hysteresis and backlash by eliminating friction and avoiding gearing while maintaining high setting speed and accuracy with a precision feedback loop. Here we present the design of the relay system and the technical solution deployed to meet the challenging specifications for drive rate, accuracy and positional encoding of the beam-steering system.

Original language	English
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/10.1117/12.2054835
Publication status	Published - 2014
Event	Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation - Montreal, Canada Duration: 23 Jun 2014 → 27 Jun 2014

Publication series

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

Conference

Conference	Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Country/Territory	Canada
City	Montreal
Period	23/06/14 → 27/06/14

Access to Document

10.1117/12.2054835

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Sharp, R., Boz, R., Hart, J., Bloxham, G., Bundy, D., Davis, J., McGregor, P. J., Nielson, J., Vest, C., & Young, P. J. (2014). The adaptive optics beam steering mirror for the GMT Integral-Field Spectrograph, GMTIFS. In C. R. Cunningham, R. Navarro, & A. A. Barto (Eds.), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation Article 91510C (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9151). SPIE. https://doi.org/10.1117/12.2054835

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title = "The adaptive optics beam steering mirror for the GMT Integral-Field Spectrograph, GMTIFS",

abstract = "To achieve the high adaptive optics sky coverage necessary to allow the GMT Integral-Field Spectrograph to access key scientific targets, the on-instrument adaptive-optics wavefront-sensing system must patrol the full 180 arcsecond diameter guide field passed to the instrument. Starlight must be held stationary on the wavefront sensor (accounting for flexure, differential refraction and non-sidereal tracking rates) to ∼ 1 milliarcsecond to provide the stable position reference signal for deep AO observations and avoid introducing image blur. Hence a tight tolerance of 1/180,000 is placed on the positioning and encoding accuracy for the cryogenic On-Instrument Wave-Front Sensor feed. GMTIFS will achieve this requirement using a beam-steering mirror system as an optical relay for starlight from across the accessible guide field. The system avoids hysteresis and backlash by eliminating friction and avoiding gearing while maintaining high setting speed and accuracy with a precision feedback loop. Here we present the design of the relay system and the technical solution deployed to meet the challenging specifications for drive rate, accuracy and positional encoding of the beam-steering system.",

keywords = "Instrumentation: adaptive optics, Instrumentation: spectrographs",

author = "R. Sharp and R. Boz and J. Hart and G. Bloxham and D. Bundy and J. Davis and McGregor, {P. J.} and J. Nielson and C. Vest and Young, {P. J.}",

note = "Publisher Copyright: {\textcopyright} 2014 SPIE.; Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation ; Conference date: 23-06-2014 Through 27-06-2014",

year = "2014",

doi = "10.1117/12.2054835",

language = "English",

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

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Sharp, R, Boz, R, Hart, J, Bloxham, G, Bundy, D, Davis, J, McGregor, PJ, Nielson, J, Vest, C & Young, PJ 2014, The adaptive optics beam steering mirror for the GMT Integral-Field Spectrograph, GMTIFS. in CR Cunningham, R Navarro & AA Barto (eds), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation., 91510C, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9151, SPIE, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, Montreal, Canada, 23/06/14. https://doi.org/10.1117/12.2054835

The adaptive optics beam steering mirror for the GMT Integral-Field Spectrograph, GMTIFS. / Sharp, R.; Boz, R.; Hart, J. et al.
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation. ed. / Colin R. Cunningham; Ramon Navarro; Allison A. Barto. SPIE, 2014. 91510C (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9151).

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

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AU - Boz, R.

AU - Hart, J.

AU - Bloxham, G.

AU - Bundy, D.

AU - Davis, J.

AU - McGregor, P. J.

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AU - Vest, C.

AU - Young, P. J.

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N2 - To achieve the high adaptive optics sky coverage necessary to allow the GMT Integral-Field Spectrograph to access key scientific targets, the on-instrument adaptive-optics wavefront-sensing system must patrol the full 180 arcsecond diameter guide field passed to the instrument. Starlight must be held stationary on the wavefront sensor (accounting for flexure, differential refraction and non-sidereal tracking rates) to ∼ 1 milliarcsecond to provide the stable position reference signal for deep AO observations and avoid introducing image blur. Hence a tight tolerance of 1/180,000 is placed on the positioning and encoding accuracy for the cryogenic On-Instrument Wave-Front Sensor feed. GMTIFS will achieve this requirement using a beam-steering mirror system as an optical relay for starlight from across the accessible guide field. The system avoids hysteresis and backlash by eliminating friction and avoiding gearing while maintaining high setting speed and accuracy with a precision feedback loop. Here we present the design of the relay system and the technical solution deployed to meet the challenging specifications for drive rate, accuracy and positional encoding of the beam-steering system.

AB - To achieve the high adaptive optics sky coverage necessary to allow the GMT Integral-Field Spectrograph to access key scientific targets, the on-instrument adaptive-optics wavefront-sensing system must patrol the full 180 arcsecond diameter guide field passed to the instrument. Starlight must be held stationary on the wavefront sensor (accounting for flexure, differential refraction and non-sidereal tracking rates) to ∼ 1 milliarcsecond to provide the stable position reference signal for deep AO observations and avoid introducing image blur. Hence a tight tolerance of 1/180,000 is placed on the positioning and encoding accuracy for the cryogenic On-Instrument Wave-Front Sensor feed. GMTIFS will achieve this requirement using a beam-steering mirror system as an optical relay for starlight from across the accessible guide field. The system avoids hysteresis and backlash by eliminating friction and avoiding gearing while maintaining high setting speed and accuracy with a precision feedback loop. Here we present the design of the relay system and the technical solution deployed to meet the challenging specifications for drive rate, accuracy and positional encoding of the beam-steering system.

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BT - Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation

A2 - Cunningham, Colin R.

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PB - SPIE

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Y2 - 23 June 2014 through 27 June 2014

ER -

Sharp R, Boz R, Hart J, Bloxham G, Bundy D, Davis J et al. The adaptive optics beam steering mirror for the GMT Integral-Field Spectrograph, GMTIFS. In Cunningham CR, Navarro R, Barto AA, editors, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation. SPIE. 2014. 91510C. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2054835

The adaptive optics beam steering mirror for the GMT Integral-Field Spectrograph, GMTIFS

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