Abstract

The adaptive optics (AO) systems with multiple laser guide stars (LGSs) may significantly benefit in terms of hardware simplification from merging several LGS optical channels into one with a single wavefront sensor. As Shack–Hartmann sensors typically suffer from incomplete filling of the camera area, there exists an opportunity to overlay several Hartmann spot patterns densely within a compact composite one, resulting in very frugal use of the camera pixels. We show that such a pattern with only slight spot overlap can be composed even in the quite extreme case of the Giant Magellan Telescope laser tomography AO system employing six highly elongated side-launched laser beacons. The problem of disentangling the overlapped spots is efficiently solvable by a generalization of the matched-filter (MF) algorithm, which is the main focus of this work. Dynamic calibration by star dithering in the case of extended MF is still possible, albeit more complicated. Computational complexity increase and performance degradation in comparison to classical MF can be minimized to acceptable values by careful system parameter tuning.

© 2019 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
A laser guide star wavefront sensor bench demonstrator for TMT

Olivier Lardière, Rodolphe Conan, Colin Bradley, Kate Jackson, and Glen Herriot
Opt. Express 16(8) 5527-5543 (2008)

Tomographic wavefront error using multi-LGS constellation sensed with Shack–Hartmann wavefront sensors

Clélia Robert, Jean-Marc Conan, Damien Gratadour, Laura Schreiber, and Thierry Fusco
J. Opt. Soc. Am. A 27(11) A201-A215 (2010)

Optimal noise-weighted reconstruction with elongated Shack–Hartmann wavefront sensor images for laser tomography adaptive optics

Richard M. Clare, Miska Le Louarn, and Clementine Béchet
Appl. Opt. 49(31) G27-G36 (2010)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (13)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (3)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (12)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription