Optical performance and phase error budgeting of future ELTs

Frederic Zamkotsian; Kjetil Dohlen; Thierry Fusco

doi:10.1117/12.551715

16 September 2004 Optical performance and phase error budgeting of future ELTs

Frederic Zamkotsian, Kjetil Dohlen, Thierry Fusco

Proceedings Volume 5497, Modeling and Systems Engineering for Astronomy; (2004) https://doi.org/10.1117/12.551715
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

Next generation giant telescopes are under study around the world, with great variety in size and pupil segmentation scheme. We present performance calculations for different pupil segmentation geometries, in the presence of segment surface errors and residual atmospheric phase errors after Adaptive Optics correction. Optical performance is evaluated through point-spread function (PSF) calculation. Pupil segmentation parameters include segment size and shape, gap diffraction, and segment surface errors. We consider large, 8m-class, circular or polygonal segments, and small, 2m-class, hexagonal segments. These options represent the choices of the different telescopes design groups. Our segmentation scheme consists of eight polygonal petals forming a filled octagonal pupil. All segment and pupil edges are along four unique directions, minimizing the number of diffraction spikes in the PSF, creating large areas of low levels of scattered light close to the core. This is important for high-dynamic range imaging. Comparison between polygonal and circular petals shows that, in addition to the presence of low-scatter areas, the encircled energy is higher. One of the most challenging goal for these future ground-based telescopes is the exo-planet detection and observation. The integration in a single model of the telescope pupil shape, aberrations on the mirrors, AO residual wavefront errors provides an evaluation of the capacity of future extremely large telescopes in the key domain of high dynamical range imaging.

Citation Download Citation

Frederic Zamkotsian, Kjetil Dohlen, and Thierry Fusco "Optical performance and phase error budgeting of future ELTs", Proc. SPIE 5497, Modeling and Systems Engineering for Astronomy, (16 September 2004); https://doi.org/10.1117/12.551715

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
9 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Adaptive optics

Point spread functions

Telescopes

Diffraction

Mirrors

Image segmentation

Actuators

Show All Keywords

Keywords/Phrases

Search In:

Publication Years