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.

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
• Public URL: https://durham-repository.worktribe.com/output/1417287