Determining the interaction matrix using starlight

Francois P. Wildi; Guido Brusa

doi:10.1117/12.552280

25 October 2004 Determining the interaction matrix using starlight

Francois P. Wildi, Guido Brusa

Proceedings Volume 5490, Advancements in Adaptive Optics; (2004) https://doi.org/10.1117/12.552280
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

The adaptive optics system of the 6.5m MMT, based on a deformable secondary mirror has been of the sky now for 6 runs of roughly 2 weeks each. Altogether its performance has been quite satisfactory with a crop of science results. However, even if the mirror has shown it promises, it has proven difficult to improve the system in terms of wavefront quality much beyond what it achieved during 1st light. In particular, it has not been possible to improve image quality by using a larger number of modes than the 52 modes used originally. One reason for this behavior could be that the interaction matrix used to build the AO controller has been measured in lab conditions using a different optical set-up than the one on the telescope. In a Cassegrain adaptive secondary AO system measuring the interaction matrix in the way all other AO systems do is impossible when the secondary is mounted on the telescope. In this paper, we present a way of measuring the interaction matrix on the telescope using real natural guide stars as sources. We present simulations results that show that this method can be used to measure the interaction matrix to a high signal-to-noise ratio.

Citation Download Citation

Francois P. Wildi and Guido Brusa "Determining the interaction matrix using starlight", Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); https://doi.org/10.1117/12.552280

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