Computer Science
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977hypi.reptr.....&link_type=abstract
Final Report, 11 Nov. 1975 - 10 Nov. 1976 Hyperfine, Inc., Fairport, NY.
Computer Science
Echelette Gratings, Echelle Gratings, Hubble Space Telescope, Ultraviolet Spectrometers, Grooving, Lyman Alpha Radiation, Metal Coatings, Photomicrography, Surface Properties, Vacuum Deposition
Scientific paper
Low frequency gratings obtainable with present technology, can meet the grating-efficiency design goals for potential space telescope spectrographs. Gratings made with changes in the three specific parameters: the ruling tool profile, the coating material, and the lubricants used during the ruling process were compared. A series of coatings and test gratings were fabricated and were examined for surface smoothness with a Nomarski differential interference microscope and an electron microsocope. Photomicrographs were obtained to show the difference in smoothness of the various coatings and rulings. Efficiency measurements were made for those test rulings that showed good groove characteristics: smoothness, proper ruling depth, and absence of defects (e.g., streaks, feathered edges and rough sides). Higher grating efficiency should be correlated with the degree of smoothness of both the coating and the grating groove.
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