Design, simulation, and verification of a radially supported 60 inch meniscus mirror in a horizontal line of sight

Saul Graham Page; Paul Rees; Andrew Dickins; Martin Coleman; Mohammed Moheen

doi:10.1117/12.3016741

17 June 2024 Design, simulation, and verification of a radially supported 60 inch meniscus mirror in a horizontal line of sight

Saul Graham Page, Paul Rees, Andrew Dickins, Martin Coleman, Mohammed Moheen

Author Affiliations +

Proceedings Volume 13021, Optical Fabrication and Testing VIII; 130210H (2024) https://doi.org/10.1117/12.3016741
Event: SPIE Optical Systems Design, 2024, Strasbourg, France

Abstract

Glyndwr Innovations Limited (GIL) has a requirement to use a Ritchey-Common optical test during the processing and final verification of a large elliptical flat mirror. The geometry of the test requires a reference sphere that is larger in diameter than the minor axis of the optical flat under test. In this implementation, the reference sphere measures approximately 60 inches in diameter, has an aspect ratio of 9:1, is a meniscus shape and has a mass of 430kg. The reference sphere support uses a tunable Schwesinger design, supporting the mirror radially, in a horizontal line of sight. FEA predicts the full aperture optical surface deformation resulting from the effects of gravity and the support of the mirror to be 95.9nm RMS, once optimized. Once integrated and tuned the interferometric testing delivers an actual optical surface deformation of 134mn RMS, with the key Zernike terms being spherical and trefoil aberrations. The final optical form of the reference sphere, measured over its illuminated diameter within the optical test, meets our test wavefront requirements.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Saul Graham Page, Paul Rees, Andrew Dickins, Martin Coleman, and Mohammed Moheen "Design, simulation, and verification of a radially supported 60 inch meniscus mirror in a horizontal line of sight", Proc. SPIE 13021, Optical Fabrication and Testing VIII, 130210H (17 June 2024); https://doi.org/10.1117/12.3016741

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