Physics – Optics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apopt..21...15h&link_type=abstract
Applied Optics, vol. 21, Jan. 1, 1982, p. 15, 16.
Physics
Optics
1
Astronomical Spectroscopy, Far Ultraviolet Radiation, Iridium, Metal Films, Mirrors, Optical Filters, Vacuum Deposition, Electron Beams, Film Thickness, Reflectance, Telescopes
Scientific paper
An iridium coating has been deposited by electron-beam evaporation on a 0.91-m mirror which serves as the telescope primary of a sounding rocket instrument for far-UV spectrometry. The evaporation was carried out by applying 8 kV at 400 mA to the electron gun. Zone refined Ir of 99.99% purity was used, and the electron beam was electromagnetically swept over the surface of the evaporant. Under these conditions, deposition rates of 0.55 A/sec were achieved. The reflectance distribution achieved at a wavelength of 584 A was extremely uniform; the mean reflectance was 21.2% with a standard deviation of only 0.3%. This represents a substantial improvement over Al + MgF2 and Al + LiF coatings for applications involving multiple reflections and weak signals, as might be expected in a high-resolution spectrograph studying distant celestial objects.
Herzig Howard
Spencer R. S.
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