A polarimeter with a new polarizer and a new device for eliminating the sky background polarization

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photography, Optical Polarization, Polarimeters, Polarizers, Sky Radiation, Modulators, Polarized Light

Scientific paper

The European Southern Observatory (ESO) has decided to procure a new two channel polarimeter which is a modification of the well known Serkowski-polarimeter (Frecker and Serkowski, 1976). The modification mainly consists of two parts. First, instead of a stationary superachromatic half-wave plate in front of the polarizing prism a pair of two phase plates with optical axes rotated by 45 deg against each other is located closely behind a double aperture diaphragm, thus allowing for an automatic elimination of the sky background polarization (Metz, 1977). Secondly, instead of a Wollaston prism a new type of polarizer will be used which combines the polarimetric accuracy of a Wollaston prism with the mechanical superiorities of a Foster prism.

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