Wavefront sensing on extended sources: Anisoplanatism effects on phase estimation

Nicolas Vedrenne; Vincent Michau; Clelia Robert; Jean-Marc Conan; Thierry Fusco

doi:10.1117/12.620924

30 August 2005 Wavefront sensing on extended sources: anisoplanatism effects on phase estimation

Nicolas Vedrenne, Vincent Michau, Clelia Robert, Jean-Marc Conan, Thierry Fusco

Proceedings Volume 5894, Advanced Wavefront Control: Methods, Devices, and Applications III; 58940S (2005) https://doi.org/10.1117/12.620924
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The atmospheric turbulence severely limits the resolution of ground based observation systems. Adaptive optics provides a real time compensation of these effects. The correction quality relies on a key component, the Wave Front Sensor (WFS), that analyses the perturbation. When observing extended sources the WFS precision is limited by anisoplanatism effects induced by the distribution of the turbulence in the volume ahead of the instrument. Anisoplanatism induces a variation of the turbulent phase and of the collected flux in the field of view. The apparent evolution of the flux variations is often called differential scintillation. We study the impact of this phase and scintillation anisoplanatism on wavefront sensing. Scintillation anisoplanatism and its coupling with phase effects have to be taken into account. An analytical expression of the error induced on the phase estimate is given in the Rytov regime. The formalism is applied to different cases of observation.

Citation Download Citation

Nicolas Vedrenne, Vincent Michau, Clelia Robert, Jean-Marc Conan, and Thierry Fusco "Wavefront sensing on extended sources: anisoplanatism effects on phase estimation", Proc. SPIE 5894, Advanced Wavefront Control: Methods, Devices, and Applications III, 58940S (30 August 2005); https://doi.org/10.1117/12.620924

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