Close

Search

Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
share
Email Facebook Twitter Google+ LinkedIn Comments

Coating Tested for Large Binocular Telescope

Photonics Spectra
Jan 2003
Bruce Atwood and his team at Ohio State University's Imaging Sciences Laboratory in Columbus are beginning full-scale tests of coating equipment designed to aluminize the two 8.4-m primary mirrors for the Large Binocular Telescope. The system will be shipped to the telescope's construction site on Mount Graham near Safford, Ariz., by February 2004.

Atwood explained that the specifications for the final mirrors call for a 1200-Å-thick coat of aluminum with a uniformity of ±10 percent over 1 m and better at smaller scales. The aluminum to be deposited will be heated in an array of 25 boron-nitride crucibles to offer higher reproducibility than tungsten filaments. He noted that the addition of hydrogen to the 22-ton vacuum chamber scatters the evaporated aluminum, which enables the use of fewer sources and small source/mirror spacing.

As We Go To PressBreaking Newscoating equipmentcoatingsLarge Binocular TelescopeMount GrahamPresstime Bulletin

Comments
Terms & Conditions Privacy Policy About Us Contact Us
back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2018 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA, info@photonics.com

Photonics Media, Laurin Publishing
x Subscribe to Photonics Spectra magazine - FREE!
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.