DIPOL-2: a double image high precision polarimeter




V. Piirola, A. Berdyugin, Svetlana Berdyugina

Ramsay S. K., McLean I. S., Takami H.

SPIE. Astronomical Telescopes and Instrumentation

2014

Proceedings of SPIE : the International Society for Optical Engineering

Ground-based and Airborn Instrumentation for Astronomy V

9147

9

0277-786X

DOIhttps://doi.org/10.1117/12.2055923



We have built a new broad-band polarimeter (DIPOL-2), capable of measuring polarization with the precision at the 10-5 level. Two dichroic beam-splitters are used to split light into three passbands (BVR), simultaneously recorded with three CCDs. A rotatable superachromatic lambda/2 (or lambda/4) plate is used as the polarization modulator and a plane parallel calcite plate as the polarization analyzer. Simple yet effective design with small number of optical elements and moving mechanical parts makes DIPOL-2 a highly versatile and reliable instrument with negligible instrumental polarization, very well suitable for observations with remotely controlled telescopes. Current and planned observing programs are briefly described.




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