Physics – Optics
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apopt..35.1742s&link_type=abstract
Applied Optics, Volume 35, Issue 10, April 1, 1996, pp.1742-1750
Physics
Optics
12
Mirrors, Optical Design And Fabrication, Optical Devices: Theory And Technology, Optical Testing, Optics At Surfaces, Physical Optics, Scattering, Surfaces, Ultraviolet: Far
Scientific paper
Measured and theoretical encircled energy and small-angle scatter of the telescope mirror (SST) of the solar ultraviolet measurements of emitted radiation (SUMER) instrument are compared at the wavelength of 123.6 nm. Mirror performance modeling was accomplished with the Optical Surface Analysis Code software package. The modeling is based on measured mirror-surface figure error data and roughness characteristics covering all important spatial frequencies that affect imaging in the vacuum ultraviolet wavelength region. Mirror-surface errors were measured with a Zygo Mark IV interferometer, Bauer Model 200 Profiler, and WYKO Topo 2-D (two-dimensional) interferometer. Performance of the SST mirror, including encircled energy and small-angle scatter, was also directly measured. A good agreement is found between measured and theoretical encircled energy within 6 arcsec and small-angle scatter up to approximately 50 arcmin from the peak. The 80% encircled energy diameter of the SST mirror is approximately 1.9 arcsec, and the amount of scattered light drops to approximately 1.0 \times 10-10 of peak irradiance (normalized to 1 arcsec2 in the focal plane) 50 arcmin from the peak. Vacuum ultraviolet performance of the mirror is degraded primarily by midfrequency errors. surfaces, vacuum ultraviolet.
Glenn Paul
Leviton Douglas B.
Saha Timo T.
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