A tomographic algorithm to determine tip-tilt information from laser guide stars

Reeves, A.P.; Morris, T.J.; Myers, R.M.; Bharmal, N.A.; Osborn, J.

doi:10.1093/mnras/stw622

A tomographic algorithm to determine tip-tilt information from laser guide stars

Reeves, A.P.; Morris, T.J.; Myers, R.M.; Bharmal, N.A.; Osborn, J.

Authors

A.P. Reeves

Professor Timothy Morris t.j.morris@durham.ac.uk
Professor

R.M. Myers

N.A. Bharmal

Dr James Osborn james.osborn@durham.ac.uk
Associate Professor

Abstract

Laser Guide Stars (LGS) have greatly increased the sky-coverage of Adaptive Optics (AO) systems. Due to the up-link turbulence experienced by LGSs, a Natural Guide Star (NGS) is still required, preventing full sky-coverage. We present a method of obtaining partial tip-tilt information from LGSs alone in multi-LGS tomographic LGS AO systems. The method of LGS up-link tip-tilt determination is derived using a geometric approach, then an alteration to the Learn and Apply algorithm for tomographic AO is made to accommodate up-link tip-tilt. Simulation results are presented, verifying that the technique shows good performance in correcting high altitude tip-tilt, but not that from low altitudes. We suggest that the method is combined with multiple far off-axis tip-tilt NGSs to provide gains in performance and sky-coverage over current tomographic AO systems.

Citation

Reeves, A., Morris, T., Myers, R., Bharmal, N., & Osborn, J. (2016). A tomographic algorithm to determine tip-tilt information from laser guide stars. Monthly Notices of the Royal Astronomical Society, 459(1), 333-341. https://doi.org/10.1093/mnras/stw622

Journal Article Type	Article
Acceptance Date	Mar 11, 2016
Online Publication Date	Mar 15, 2016
Publication Date	Jun 11, 2016
Deposit Date	Mar 14, 2016
Publicly Available Date	Mar 16, 2016
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	459
Issue	1
Pages	333-341
DOI	https://doi.org/10.1093/mnras/stw622
Keywords	reeves laser tomography

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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.