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Laboratory Studies of Alkali Metal Filter Deposition, Ultraviolet Transmission, and Visible Blocking

Trauger, John T.; Vincent, Mark B.; Clarke, John T. +4 more

Far-ultraviolet alkali metal or Wood s filters have been produced and tested supporting the production of a flight filter for the Wide Field Planetary Camera 2 on the Hubble Space Telescope. Sodium layers 0.5 1- m thick transmit up to 40% in the ultraviolet while efficiently blocking visible wavelengths. The prevention of visible pinholes is assis…