Physics – Optics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apopt..42.3950c&link_type=abstract
Applied Optics, Volume 42, Issue 19, pp. 3950-3956 (2003).
Physics
Optics
4
Optical Polarisers, Polarimetry, Ultraviolet Spectra, Ultraviolet Spectroscopy, Angular Measurement
Scientific paper
Astronomical measurements in the vacuum-UV spectral region (30-190 nm) require space instruments and techniques that are at the boundary between visible and x-ray techniques. In vacuum-UV polarimetry, transmission polarizers must be replaced by reflection polarizers because of the lack of transparent materials in the 30-105-nm range. The general features of a single reflection polarization analyzer for the vacuum UV are introduced and described, with particular emphasis on astrophysical applications. In particular, we discuss the trade-off conditions for optimum polarization and throughput of a single-reflection surface in the vacuum UV, introducing a quality factor parameter. The polarization performances of various reflecting materials are obtained with a reflecting vacuum-UV polarization analyzer laboratory model designed and built to measure the state of linear polarization. On the basis of a comparison of the quality factors, calcium fluoride is determined to be the best-performing material. Finally, we discuss the laboratory polarimetric characterizations of the material properties for astronomical application of the polarization analyzer.
Corti Gianni
Romoli Marco
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