First steps in ELT optics polishing

Roland Geyl; D. Bardon; R. Bourgois; N. Ferachoglou; E. Harel; C. Couteret

doi:10.1117/12.2317604

7 August 2018 First steps in ELT optics polishing

Roland Geyl, D. Bardon, R. Bourgois, N. Ferachoglou, E. Harel, C. Couteret

Proceedings Volume 10829, Fifth European Seminar on Precision Optics Manufacturing; 1082904 (2018) https://doi.org/10.1117/12.2317604
Event: Fifth European Seminar on Precision Optics Manufacturing, 2018, Teisnach, Germany

Abstract

Green light for the construction of the 39-m aperture giant Extremely Large Telescope (ELT) was given by the European Southern Observatory (ESO) council on Dec 4th, 2014. Procurement of the key elements, especially the optics, was immediately initiated by ESO team. Up today, Safran Reosc was awarded all the key optical polishing and testing contracts with:

2015-07: contract for the Adaptive Optics M4 mirror thin glass petals,

2016-07: contract for the 4-m M2 convex mirror,

2017-02: contract for the 4-m M3 mirror.

2017-05: contract for polishing and intergation of the 931 1.45-m hexagonal segments for the giant 39-m M1 mirror assembly

This paper is dedicated to highlighting the various challenges linked to these various optical fabrication projects and reporting about the progress of our work so far.

Citation Download Citation

Roland Geyl, D. Bardon, R. Bourgois, N. Ferachoglou, E. Harel, and C. Couteret "First steps in ELT optics polishing ", Proc. SPIE 10829, Fifth European Seminar on Precision Optics Manufacturing, 1082904 (7 August 2018); https://doi.org/10.1117/12.2317604

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