Abstract

Normal incidence thin film interference mirrors and filters have been designed to image the O ii 834-Å airglow. It is shown that MgF2 is a useful spacer material for this wavelength region. The mirrors consist of thin layers of MgF2 in combination with other materials that are chosen to reflect efficiently in a narrow band centered at 834 Å. Peak reflectance of 60% can be obtained with a passband 200 Å wide. Al/MgF2/Si and Al/MgF2/SiC interference coatings have been designed to reflect 834 Å and to absorbe the intense H i 1216 Å airglow. An In/MgF2/In interference filter is designed to transmit 834 Å and attenuate 1216 Å radiation. Interference photocathode coatings for rejecting 1216 Å radiation are also discussed.

© 1991 Optical Society of America

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