A laser tomography test bed for extremely large telescopes

R. Conan; P. Piatrou; F. Rigaut; K. Uhlendorf

doi:10.1117/12.2054471

A laser tomography test bed for extremely large telescopes

R. Conan^*, P. Piatrou, F. Rigaut, K. Uhlendorf

^*Corresponding author for this work

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

Abstract

The Advanced Instrumentation and Technology Center at the Australian National University is building a Laser Tomography Adaptive Optics Test Bed for Extremely Large Telescopes. The optical test bench is using three Laser Guide Stars (LGS) propagating through three phase screens. The LGS wavefronts are sampled with a 16 × 16 Shack-Hartmann wavefront sensor (SH-WFS). Cone effect, spot elongation and Sodium layer density fluctuations are reproduced on the bench. Two Natural Guide Stars (NGS), on-axis and off-axis, are also added to the bench. The wavefront of the on-axis NGS is corrected with a DM located in the optical path of both the LGSs and the on-axis NGS. The DM commands are derived from the tomographic estimate of the on-axis NGS wavefront using the measurements of the 3 LGS WFSs. The off-axis NGS wavefront is sampled with a 6 × 6 SH-WFS and is emulating tip-tilt, focus and truth sensing. A DM located in front of the off-axis NGS WFS is correcting the off-axis NGS wavefront. The commands of this DM are also derived from the tomographic reconstructor. In the paper, the design of the LTAO test bed is presented.

Original language	English
Title of host publication	Adaptive Optics Systems IV
Editors	Jean-Pierre Veran, Enrico Marchetti, Laird M. Close
Publisher	SPIE
ISBN (Electronic)	9780819496164
DOIs	https://doi.org/10.1117/12.2054471
Publication status	Published - 2014
Event	Adaptive Optics Systems IV - Montreal, Canada Duration: 22 Jun 2014 → 27 Jun 2014

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	9148
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Adaptive Optics Systems IV
Country/Territory	Canada
City	Montreal
Period	22/06/14 → 27/06/14

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10.1117/12.2054471

Cite this

@inproceedings{4ddc579212df4bef86f1c8c4761020a9,

title = "A laser tomography test bed for extremely large telescopes",

abstract = "The Advanced Instrumentation and Technology Center at the Australian National University is building a Laser Tomography Adaptive Optics Test Bed for Extremely Large Telescopes. The optical test bench is using three Laser Guide Stars (LGS) propagating through three phase screens. The LGS wavefronts are sampled with a 16 × 16 Shack-Hartmann wavefront sensor (SH-WFS). Cone effect, spot elongation and Sodium layer density fluctuations are reproduced on the bench. Two Natural Guide Stars (NGS), on-axis and off-axis, are also added to the bench. The wavefront of the on-axis NGS is corrected with a DM located in the optical path of both the LGSs and the on-axis NGS. The DM commands are derived from the tomographic estimate of the on-axis NGS wavefront using the measurements of the 3 LGS WFSs. The off-axis NGS wavefront is sampled with a 6 × 6 SH-WFS and is emulating tip-tilt, focus and truth sensing. A DM located in front of the off-axis NGS WFS is correcting the off-axis NGS wavefront. The commands of this DM are also derived from the tomographic reconstructor. In the paper, the design of the LTAO test bed is presented.",

keywords = "adaptive optics, atmospheric turbulence, wavefront sensing",

author = "R. Conan and P. Piatrou and F. Rigaut and K. Uhlendorf",

note = "Publisher Copyright: {\textcopyright} 2014 SPIE.; Adaptive Optics Systems IV ; Conference date: 22-06-2014 Through 27-06-2014",

year = "2014",

doi = "10.1117/12.2054471",

language = "English",

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

publisher = "SPIE",

editor = "Jean-Pierre Veran and Enrico Marchetti and Close, {Laird M.}",

booktitle = "Adaptive Optics Systems IV",

address = "United States",

}

Conan, R, Piatrou, P, Rigaut, F & Uhlendorf, K 2014, A laser tomography test bed for extremely large telescopes. in J-P Veran, E Marchetti & LM Close (eds), Adaptive Optics Systems IV., 91485T, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9148, SPIE, Adaptive Optics Systems IV, Montreal, Canada, 22/06/14. https://doi.org/10.1117/12.2054471

A laser tomography test bed for extremely large telescopes. / Conan, R.; Piatrou, P.; Rigaut, F. et al.
Adaptive Optics Systems IV. ed. / Jean-Pierre Veran; Enrico Marchetti; Laird M. Close. SPIE, 2014. 91485T (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9148).

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

TY - GEN

T1 - A laser tomography test bed for extremely large telescopes

AU - Conan, R.

AU - Piatrou, P.

AU - Rigaut, F.

AU - Uhlendorf, K.

PY - 2014

Y1 - 2014

N2 - The Advanced Instrumentation and Technology Center at the Australian National University is building a Laser Tomography Adaptive Optics Test Bed for Extremely Large Telescopes. The optical test bench is using three Laser Guide Stars (LGS) propagating through three phase screens. The LGS wavefronts are sampled with a 16 × 16 Shack-Hartmann wavefront sensor (SH-WFS). Cone effect, spot elongation and Sodium layer density fluctuations are reproduced on the bench. Two Natural Guide Stars (NGS), on-axis and off-axis, are also added to the bench. The wavefront of the on-axis NGS is corrected with a DM located in the optical path of both the LGSs and the on-axis NGS. The DM commands are derived from the tomographic estimate of the on-axis NGS wavefront using the measurements of the 3 LGS WFSs. The off-axis NGS wavefront is sampled with a 6 × 6 SH-WFS and is emulating tip-tilt, focus and truth sensing. A DM located in front of the off-axis NGS WFS is correcting the off-axis NGS wavefront. The commands of this DM are also derived from the tomographic reconstructor. In the paper, the design of the LTAO test bed is presented.

AB - The Advanced Instrumentation and Technology Center at the Australian National University is building a Laser Tomography Adaptive Optics Test Bed for Extremely Large Telescopes. The optical test bench is using three Laser Guide Stars (LGS) propagating through three phase screens. The LGS wavefronts are sampled with a 16 × 16 Shack-Hartmann wavefront sensor (SH-WFS). Cone effect, spot elongation and Sodium layer density fluctuations are reproduced on the bench. Two Natural Guide Stars (NGS), on-axis and off-axis, are also added to the bench. The wavefront of the on-axis NGS is corrected with a DM located in the optical path of both the LGSs and the on-axis NGS. The DM commands are derived from the tomographic estimate of the on-axis NGS wavefront using the measurements of the 3 LGS WFSs. The off-axis NGS wavefront is sampled with a 6 × 6 SH-WFS and is emulating tip-tilt, focus and truth sensing. A DM located in front of the off-axis NGS WFS is correcting the off-axis NGS wavefront. The commands of this DM are also derived from the tomographic reconstructor. In the paper, the design of the LTAO test bed is presented.

KW - adaptive optics

KW - atmospheric turbulence

KW - wavefront sensing

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DO - 10.1117/12.2054471

M3 - Conference contribution

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

BT - Adaptive Optics Systems IV

A2 - Veran, Jean-Pierre

A2 - Marchetti, Enrico

A2 - Close, Laird M.

PB - SPIE

T2 - Adaptive Optics Systems IV

Y2 - 22 June 2014 through 27 June 2014

ER -

A laser tomography test bed for extremely large telescopes

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