Development of silver coating options for the Gemini 8-m telescopes project

Michael Ray Jacobson; Ruth C. Kneale; Fred C. Gillett; Keith Raybould; John F. Filhaber; Charles K. Carniglia; Ronald Laird; Dennis Kitchens; Ric P. Shimshock; Donald C. Booth

doi:10.1117/12.319269

25 August 1998 Development of silver coating options for the Gemini 8-m telescopes project

Michael Ray Jacobson, Ruth C. Kneale, Fred C. Gillett, Keith Raybould, John F. Filhaber, Charles K. Carniglia, Ronald Laird, Dennis Kitchens, Ric P. Shimshock, Donald C. Booth

Author Affiliations +

Proceedings Volume 3352, Advanced Technology Optical/IR Telescopes VI; (1998) https://doi.org/10.1117/12.319269
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

Acting as a prime contractor to the Gemini Project, the Optical Data Associates (ODA), with its major subcontractors, BOC Coating Technologies (BOCCT) and Deposition Sciences, Inc. (DSI), developed options for depositing protected silver coatings on the 8-M primary mirrors. The project began with a study that identified sputtering as the preferred deposition technique, defined a set of candidate adhesor and protective coatings for the silver layer, and simulated stack performance. The next phase involved pilot magnetron sputtering studies by BOCCT and DSI of designs involving silicon nitride and hafnia, respectively. ODA also developed mid-IR reflectance standards at (lambda) equals 10.6 micrometers to control the silver coating measurements in the critical 8 - 12 micrometers atmospheric window. The study results were successful, with both BOCCT and DSI producing Ag coatings with R equals 0.9920 +/- 0.0001 and protected Ag coatings with R equals 0.9910 +/- 0.0001. The Gemini Project coating plants are designed to sputter bare and protected Al and Ag coatings.

Citation Download Citation

Michael Ray Jacobson, Ruth C. Kneale, Fred C. Gillett, Keith Raybould, John F. Filhaber, Charles K. Carniglia, Ronald Laird, Dennis Kitchens, Ric P. Shimshock, and Donald C. Booth "Development of silver coating options for the Gemini 8-m telescopes project", Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); https://doi.org/10.1117/12.319269

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