Damage and removal of the coating on the first lens of the MegaCam wide-field corrector

Gregory Barrick; Tom Benedict; Derrick Salmon

doi:10.1117/12.2233045

9 August 2016 Damage and removal of the coating on the first lens of the MegaCam wide-field corrector

Gregory Barrick, Tom Benedict, Derrick Salmon

Proceedings Volume 9908, Ground-based and Airborne Instrumentation for Astronomy VI; 99082P (2016) https://doi.org/10.1117/12.2233045
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

The coating on the exposed surface of the 810 mm diameter first element of the MegaCam wide-field corrector at the Canada-France-Hawaii Telescope (CFHT) was found to be degraded in the fall of 2014. An investigation showed that the coating was, in fact, damaged over a large part of the exposed surface and was causing major scattering, severely degrading the performance of the instrument. The coating was subsequently removed from the lens by CFHT, restoring the majority of the instrument performance. The investigation of the degradation and the procedure used to remove the coating will be described in this paper.

Citation Download Citation

Gregory Barrick, Tom Benedict, and Derrick Salmon "Damage and removal of the coating on the first lens of the MegaCam wide-field corrector", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99082P (9 August 2016); https://doi.org/10.1117/12.2233045

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