Performance of a Shack-Hartmann wavefront sensor using real sodium laser data

Sandrine J. Thomas; Donald Gavel; Nicolas Muller; Vincent Michau; Thierry Fusco

doi:10.1117/12.857600

14 July 2010 Performance of a Shack-Hartmann wavefront sensor using real sodium laser data

Sandrine J. Thomas, Donald Gavel, Nicolas Muller, Vincent Michau, Thierry Fusco

Proceedings Volume 7736, Adaptive Optics Systems II; 77365F (2010) https://doi.org/10.1117/12.857600
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

The future of adaptive optics includes laser guide stars. While they are a great solution to sky coverage, they do introduce additional errors in the adaptive optics system. In particular, because of the finite thickness of the sodium layer, there is reduced centroiding accuracy due to elongated spots in the wavefront sensor. These become even more pronounced on large telescope apertures. In this paper we focus on the performance of a Shack-Hartmann wavefront sensor for 30m-plus large aperture telescopes studying the consequences of both the decrease in signal to noise ratio due to the spot elongation and the variations of the sodium density variations in the mesosphere. We incorporate real on-sky measurements of the return from the sodium layer using images of the laser guide star taken at Lick Observatory and simulate the expected wavefront reconstruction performance in the case of a Thirty Meter Telescope. Using this ensemble of data, we compare performance for various Hartmann centroiding methods, including correlation and weighted least square algorithms.

Citation Download Citation

Sandrine J. Thomas, Donald Gavel, Nicolas Muller, Vincent Michau, and Thierry Fusco "Performance of a Shack-Hartmann wavefront sensor using real sodium laser data", Proc. SPIE 7736, Adaptive Optics Systems II, 77365F (14 July 2010); https://doi.org/10.1117/12.857600

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available