Non-invasive optical end-to-end test of a large TMA telescope (JWST) from the intermediate focus

Tony Whitman; J. Scott Knight; Mark Waldman; Paul Lightsey

doi:10.1117/12.826493

26 August 2009 Non-invasive optical end-to-end test of a large TMA telescope (JWST) from the intermediate focus

Tony Whitman, J. Scott Knight, Mark Waldman, Paul Lightsey

Proceedings Volume 7436, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts IV; 74360E (2009) https://doi.org/10.1117/12.826493
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

The James Webb Space Telescope (JWST) requires testing of the full optical system in a cryogenic vacuum environment before launch. Challenges with the telescope architecture and the test environment lead to placing removable optical test sources at the Cassegrain intermediate focus of the Telescope. The Science Instrument suite will be used to align the telescope and to verify the wavefront error. The Science Instruments capture test images that are analyzed using focus diverse phase retrieval. The wavefront sensing algorithms have the large dynamic range required to measure the relatively small wavefronts of interest in the presence of the large aberrations resulting from the off-axis source locations at the intermediate focus. These inherent aberrations of the off-axis design are removed analytically from the measured data. The test design and in-situ wavefront sensing process enables a number of tests to verify the alignment and optical quality of the system.

Citation Download Citation

Tony Whitman, J. Scott Knight, Mark Waldman, and Paul Lightsey "Non-invasive optical end-to-end test of a large TMA telescope (JWST) from the intermediate focus", Proc. SPIE 7436, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts IV, 74360E (26 August 2009); https://doi.org/10.1117/12.826493

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