Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980cnes.rept.....s&link_type=abstract
In CNES FOC F/96 Polarizers 4 p (SEE N82-14915 05-74)
Astronomy and Astrophysics
Astronomy
Astronomical Photography, Faint Object Camera, Far Ultraviolet Radiation, Polarizers, Prisms, Absorptivity, Birefringence, Light Scattering, Magnesium Fluorides, Spaceborne Telescopes, Ultraviolet Spectrophotometers
Scientific paper
An MgF2 double Rochon prism, useful as a polarizer or analyzer in wavelengths longer than 1300A is described. Measurements of MgF2 transmission and of polarizer angular beam deviation from 1150 to 2900A are presented. The prism is comprised of 2.25 mm, MgF2 depolarizers, optically contacted. At normal incidence, a 4% transmission gain was measured from 6000 to 2200A, compared with air spaced elements. One depolarizer was vibrated to 40 g from 20 to 3500 Hz without deterioration in optical contact. Transmissions below 1400A are not good. In thin samples, surface loss is twice absorption loss in the range 1150 to 1500A. Refraction indices and a computer ray trace were used in processing photographic beam divergence data. If care is taken to remedy scattering effects, the prism is an efficient on-axis polarizer in the 1300 to 3000A range.
Forbes Florence
Phillips W. G.
Steinmetz David L.
Wirick M.
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